[llvm] [AMDGPU] Remove dead pass: AMDGPUMachineCFGStructurizer (PR #105645)
Juan Manuel Martinez Caamaño via llvm-commits
llvm-commits at lists.llvm.org
Fri Aug 23 01:34:58 PDT 2024
https://github.com/jmmartinez updated https://github.com/llvm/llvm-project/pull/105645
>From add4c7d219c9f8e4858555646fdeaeee0c0a8699 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juan=20Manuel=20Martinez=20Caama=C3=B1o?= <juamarti at amd.com>
Date: Thu, 22 Aug 2024 11:21:39 +0200
Subject: [PATCH] [AMDGPU] Remove dead pass: AMDGPUMachineCFGStructurizer
---
llvm/lib/Target/AMDGPU/AMDGPU.h | 4 -
llvm/lib/Target/AMDGPU/AMDGPU.td | 3 -
llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp | 4 +-
llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h | 2 -
.../AMDGPU/AMDGPUInstructionSelector.cpp | 1 -
.../Target/AMDGPU/AMDGPUInstructionSelector.h | 1 -
.../AMDGPU/AMDGPUMachineCFGStructurizer.cpp | 2837 -----------------
.../lib/Target/AMDGPU/AMDGPUTargetMachine.cpp | 24 +-
llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.h | 1 -
llvm/lib/Target/AMDGPU/CMakeLists.txt | 1 -
llvm/lib/Target/AMDGPU/SIInstrInfo.cpp | 101 +-
llvm/lib/Target/AMDGPU/SIInstrInfo.h | 8 -
llvm/lib/Target/AMDGPU/SIInstructions.td | 9 -
13 files changed, 12 insertions(+), 2984 deletions(-)
delete mode 100644 llvm/lib/Target/AMDGPU/AMDGPUMachineCFGStructurizer.cpp
diff --git a/llvm/lib/Target/AMDGPU/AMDGPU.h b/llvm/lib/Target/AMDGPU/AMDGPU.h
index f5044f52f1648d..afb8f2d93f0f15 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPU.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPU.h
@@ -57,7 +57,6 @@ FunctionPass *createAMDGPUImageIntrinsicOptimizerPass(const TargetMachine *);
ModulePass *createAMDGPURemoveIncompatibleFunctionsPass(const TargetMachine *);
FunctionPass *createAMDGPUCodeGenPreparePass();
FunctionPass *createAMDGPULateCodeGenPrepareLegacyPass();
-FunctionPass *createAMDGPUMachineCFGStructurizerPass();
FunctionPass *createAMDGPURewriteOutArgumentsPass();
ModulePass *
createAMDGPULowerModuleLDSLegacyPass(const AMDGPUTargetMachine *TM = nullptr);
@@ -92,9 +91,6 @@ class SILowerI1CopiesPass : public PassInfoMixin<SILowerI1CopiesPass> {
void initializeAMDGPUDAGToDAGISelLegacyPass(PassRegistry &);
-void initializeAMDGPUMachineCFGStructurizerPass(PassRegistry&);
-extern char &AMDGPUMachineCFGStructurizerID;
-
void initializeAMDGPUAlwaysInlinePass(PassRegistry&);
Pass *createAMDGPUAnnotateKernelFeaturesPass();
diff --git a/llvm/lib/Target/AMDGPU/AMDGPU.td b/llvm/lib/Target/AMDGPU/AMDGPU.td
index 9efdbd751d96e3..5757ac0d4454d0 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPU.td
+++ b/llvm/lib/Target/AMDGPU/AMDGPU.td
@@ -2253,9 +2253,6 @@ def HasDefaultComponentBroadcast
def HasDsSrc2Insts : Predicate<"!Subtarget->hasDsSrc2Insts()">,
AssemblerPredicate<(all_of FeatureDsSrc2Insts)>;
-def EnableLateCFGStructurize : Predicate<
- "EnableLateStructurizeCFG">;
-
def EnableFlatScratch : Predicate<"Subtarget->enableFlatScratch()">;
def DisableFlatScratch : Predicate<"!Subtarget->enableFlatScratch()">;
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
index 6a0134e07567a1..0daaf6b6576030 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
@@ -121,9 +121,7 @@ FunctionPass *llvm::createAMDGPUISelDag(TargetMachine &TM,
AMDGPUDAGToDAGISel::AMDGPUDAGToDAGISel(TargetMachine &TM,
CodeGenOptLevel OptLevel)
- : SelectionDAGISel(TM, OptLevel) {
- EnableLateStructurizeCFG = AMDGPUTargetMachine::EnableLateStructurizeCFG;
-}
+ : SelectionDAGISel(TM, OptLevel) {}
bool AMDGPUDAGToDAGISel::runOnMachineFunction(MachineFunction &MF) {
Subtarget = &MF.getSubtarget<GCNSubtarget>();
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
index 45a951352c1eb1..11c4cdd560c2f3 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
@@ -68,8 +68,6 @@ class AMDGPUDAGToDAGISel : public SelectionDAGISel {
// Default FP mode for the current function.
SIModeRegisterDefaults Mode;
- bool EnableLateStructurizeCFG;
-
// Instructions that will be lowered with a final instruction that zeros the
// high result bits.
bool fp16SrcZerosHighBits(unsigned Opc) const;
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
index 05ed1b322c0d1b..17071970ca4bfe 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
@@ -45,7 +45,6 @@ AMDGPUInstructionSelector::AMDGPUInstructionSelector(
const AMDGPUTargetMachine &TM)
: TII(*STI.getInstrInfo()), TRI(*STI.getRegisterInfo()), RBI(RBI), TM(TM),
STI(STI),
- EnableLateStructurizeCFG(AMDGPUTargetMachine::EnableLateStructurizeCFG),
#define GET_GLOBALISEL_PREDICATES_INIT
#include "AMDGPUGenGlobalISel.inc"
#undef GET_GLOBALISEL_PREDICATES_INIT
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
index 69806b240cf2bc..207cd67f0eda0e 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
@@ -371,7 +371,6 @@ class AMDGPUInstructionSelector final : public InstructionSelector {
const AMDGPURegisterBankInfo &RBI;
const AMDGPUTargetMachine &TM;
const GCNSubtarget &STI;
- bool EnableLateStructurizeCFG;
#define GET_GLOBALISEL_PREDICATES_DECL
#define AMDGPUSubtarget GCNSubtarget
#include "AMDGPUGenGlobalISel.inc"
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUMachineCFGStructurizer.cpp b/llvm/lib/Target/AMDGPU/AMDGPUMachineCFGStructurizer.cpp
deleted file mode 100644
index 07b2ecc2fed0e9..00000000000000
--- a/llvm/lib/Target/AMDGPU/AMDGPUMachineCFGStructurizer.cpp
+++ /dev/null
@@ -1,2837 +0,0 @@
-//===- AMDGPUMachineCFGStructurizer.cpp - Machine code if conversion pass. ===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements the machine instruction level CFG structurizer pass.
-//
-//===----------------------------------------------------------------------===//
-
-#include "AMDGPU.h"
-#include "GCNSubtarget.h"
-#include "llvm/ADT/DenseSet.h"
-#include "llvm/ADT/PostOrderIterator.h"
-#include "llvm/ADT/SetVector.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/CodeGen/MachineBasicBlock.h"
-#include "llvm/CodeGen/MachineInstrBuilder.h"
-#include "llvm/CodeGen/MachineRegionInfo.h"
-#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/CodeGen/TargetRegisterInfo.h"
-#include "llvm/InitializePasses.h"
-
-using namespace llvm;
-
-#define DEBUG_TYPE "amdgpucfgstructurizer"
-
-namespace {
-
-class PHILinearizeDestIterator;
-
-class PHILinearize {
- friend class PHILinearizeDestIterator;
-
-public:
- using PHISourceT = std::pair<unsigned, MachineBasicBlock *>;
-
-private:
- using PHISourcesT = DenseSet<PHISourceT>;
- using PHIInfoElementT = struct {
- unsigned DestReg;
- DebugLoc DL;
- PHISourcesT Sources;
- };
- using PHIInfoT = SmallPtrSet<PHIInfoElementT *, 2>;
- PHIInfoT PHIInfo;
-
- static unsigned phiInfoElementGetDest(PHIInfoElementT *Info);
- static void phiInfoElementSetDef(PHIInfoElementT *Info, unsigned NewDef);
- static PHISourcesT &phiInfoElementGetSources(PHIInfoElementT *Info);
- static void phiInfoElementAddSource(PHIInfoElementT *Info, unsigned SourceReg,
- MachineBasicBlock *SourceMBB);
- static void phiInfoElementRemoveSource(PHIInfoElementT *Info,
- unsigned SourceReg,
- MachineBasicBlock *SourceMBB);
- PHIInfoElementT *findPHIInfoElement(unsigned DestReg);
- PHIInfoElementT *findPHIInfoElementFromSource(unsigned SourceReg,
- MachineBasicBlock *SourceMBB);
-
-public:
- bool findSourcesFromMBB(MachineBasicBlock *SourceMBB,
- SmallVector<unsigned, 4> &Sources);
- void addDest(unsigned DestReg, const DebugLoc &DL);
- void replaceDef(unsigned OldDestReg, unsigned NewDestReg);
- void deleteDef(unsigned DestReg);
- void addSource(unsigned DestReg, unsigned SourceReg,
- MachineBasicBlock *SourceMBB);
- void removeSource(unsigned DestReg, unsigned SourceReg,
- MachineBasicBlock *SourceMBB = nullptr);
- bool findDest(unsigned SourceReg, MachineBasicBlock *SourceMBB,
- unsigned &DestReg);
- bool isSource(unsigned Reg, MachineBasicBlock *SourceMBB = nullptr);
- unsigned getNumSources(unsigned DestReg);
- void dump(MachineRegisterInfo *MRI);
- void clear();
-
- using source_iterator = PHISourcesT::iterator;
- using dest_iterator = PHILinearizeDestIterator;
-
- dest_iterator dests_begin();
- dest_iterator dests_end();
-
- source_iterator sources_begin(unsigned Reg);
- source_iterator sources_end(unsigned Reg);
-};
-
-class PHILinearizeDestIterator {
-private:
- PHILinearize::PHIInfoT::iterator Iter;
-
-public:
- PHILinearizeDestIterator(PHILinearize::PHIInfoT::iterator I) : Iter(I) {}
-
- unsigned operator*() { return PHILinearize::phiInfoElementGetDest(*Iter); }
- PHILinearizeDestIterator &operator++() {
- ++Iter;
- return *this;
- }
- bool operator==(const PHILinearizeDestIterator &I) const {
- return I.Iter == Iter;
- }
- bool operator!=(const PHILinearizeDestIterator &I) const {
- return I.Iter != Iter;
- }
-};
-
-} // end anonymous namespace
-
-unsigned PHILinearize::phiInfoElementGetDest(PHIInfoElementT *Info) {
- return Info->DestReg;
-}
-
-void PHILinearize::phiInfoElementSetDef(PHIInfoElementT *Info,
- unsigned NewDef) {
- Info->DestReg = NewDef;
-}
-
-PHILinearize::PHISourcesT &
-PHILinearize::phiInfoElementGetSources(PHIInfoElementT *Info) {
- return Info->Sources;
-}
-
-void PHILinearize::phiInfoElementAddSource(PHIInfoElementT *Info,
- unsigned SourceReg,
- MachineBasicBlock *SourceMBB) {
- // Assertion ensures we don't use the same SourceMBB for the
- // sources, because we cannot have different registers with
- // identical predecessors, but we can have the same register for
- // multiple predecessors.
-#if !defined(NDEBUG)
- for (auto SI : phiInfoElementGetSources(Info)) {
- assert((SI.second != SourceMBB || SourceReg == SI.first));
- }
-#endif
-
- phiInfoElementGetSources(Info).insert(PHISourceT(SourceReg, SourceMBB));
-}
-
-void PHILinearize::phiInfoElementRemoveSource(PHIInfoElementT *Info,
- unsigned SourceReg,
- MachineBasicBlock *SourceMBB) {
- auto &Sources = phiInfoElementGetSources(Info);
- SmallVector<PHISourceT, 4> ElimiatedSources;
- for (auto SI : Sources) {
- if (SI.first == SourceReg &&
- (SI.second == nullptr || SI.second == SourceMBB)) {
- ElimiatedSources.push_back(PHISourceT(SI.first, SI.second));
- }
- }
-
- for (auto &Source : ElimiatedSources) {
- Sources.erase(Source);
- }
-}
-
-PHILinearize::PHIInfoElementT *
-PHILinearize::findPHIInfoElement(unsigned DestReg) {
- for (auto *I : PHIInfo) {
- if (phiInfoElementGetDest(I) == DestReg) {
- return I;
- }
- }
- return nullptr;
-}
-
-PHILinearize::PHIInfoElementT *
-PHILinearize::findPHIInfoElementFromSource(unsigned SourceReg,
- MachineBasicBlock *SourceMBB) {
- for (auto *I : PHIInfo) {
- for (auto SI : phiInfoElementGetSources(I)) {
- if (SI.first == SourceReg &&
- (SI.second == nullptr || SI.second == SourceMBB)) {
- return I;
- }
- }
- }
- return nullptr;
-}
-
-bool PHILinearize::findSourcesFromMBB(MachineBasicBlock *SourceMBB,
- SmallVector<unsigned, 4> &Sources) {
- bool FoundSource = false;
- for (auto *I : PHIInfo) {
- for (auto SI : phiInfoElementGetSources(I)) {
- if (SI.second == SourceMBB) {
- FoundSource = true;
- Sources.push_back(SI.first);
- }
- }
- }
- return FoundSource;
-}
-
-void PHILinearize::addDest(unsigned DestReg, const DebugLoc &DL) {
- assert(findPHIInfoElement(DestReg) == nullptr && "Dest already exists");
- PHISourcesT EmptySet;
- PHIInfoElementT *NewElement = new PHIInfoElementT();
- NewElement->DestReg = DestReg;
- NewElement->DL = DL;
- NewElement->Sources = EmptySet;
- PHIInfo.insert(NewElement);
-}
-
-void PHILinearize::replaceDef(unsigned OldDestReg, unsigned NewDestReg) {
- phiInfoElementSetDef(findPHIInfoElement(OldDestReg), NewDestReg);
-}
-
-void PHILinearize::deleteDef(unsigned DestReg) {
- PHIInfoElementT *InfoElement = findPHIInfoElement(DestReg);
- PHIInfo.erase(InfoElement);
- delete InfoElement;
-}
-
-void PHILinearize::addSource(unsigned DestReg, unsigned SourceReg,
- MachineBasicBlock *SourceMBB) {
- phiInfoElementAddSource(findPHIInfoElement(DestReg), SourceReg, SourceMBB);
-}
-
-void PHILinearize::removeSource(unsigned DestReg, unsigned SourceReg,
- MachineBasicBlock *SourceMBB) {
- phiInfoElementRemoveSource(findPHIInfoElement(DestReg), SourceReg, SourceMBB);
-}
-
-bool PHILinearize::findDest(unsigned SourceReg, MachineBasicBlock *SourceMBB,
- unsigned &DestReg) {
- PHIInfoElementT *InfoElement =
- findPHIInfoElementFromSource(SourceReg, SourceMBB);
- if (InfoElement != nullptr) {
- DestReg = phiInfoElementGetDest(InfoElement);
- return true;
- }
- return false;
-}
-
-bool PHILinearize::isSource(unsigned Reg, MachineBasicBlock *SourceMBB) {
- unsigned DestReg;
- return findDest(Reg, SourceMBB, DestReg);
-}
-
-unsigned PHILinearize::getNumSources(unsigned DestReg) {
- return phiInfoElementGetSources(findPHIInfoElement(DestReg)).size();
-}
-
-#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
-LLVM_DUMP_METHOD void PHILinearize::dump(MachineRegisterInfo *MRI) {
- const TargetRegisterInfo *TRI = MRI->getTargetRegisterInfo();
- dbgs() << "=PHIInfo Start=\n";
- for (auto *PII : this->PHIInfo) {
- PHIInfoElementT &Element = *PII;
- dbgs() << "Dest: " << printReg(Element.DestReg, TRI)
- << " Sources: {";
- for (auto &SI : Element.Sources) {
- dbgs() << printReg(SI.first, TRI) << '(' << printMBBReference(*SI.second)
- << "),";
- }
- dbgs() << "}\n";
- }
- dbgs() << "=PHIInfo End=\n";
-}
-#endif
-
-void PHILinearize::clear() { PHIInfo = PHIInfoT(); }
-
-PHILinearize::dest_iterator PHILinearize::dests_begin() {
- return PHILinearizeDestIterator(PHIInfo.begin());
-}
-
-PHILinearize::dest_iterator PHILinearize::dests_end() {
- return PHILinearizeDestIterator(PHIInfo.end());
-}
-
-PHILinearize::source_iterator PHILinearize::sources_begin(unsigned Reg) {
- auto InfoElement = findPHIInfoElement(Reg);
- return phiInfoElementGetSources(InfoElement).begin();
-}
-
-PHILinearize::source_iterator PHILinearize::sources_end(unsigned Reg) {
- auto InfoElement = findPHIInfoElement(Reg);
- return phiInfoElementGetSources(InfoElement).end();
-}
-
-static unsigned getPHINumInputs(MachineInstr &PHI) {
- assert(PHI.isPHI());
- return (PHI.getNumOperands() - 1) / 2;
-}
-
-static MachineBasicBlock *getPHIPred(MachineInstr &PHI, unsigned Index) {
- assert(PHI.isPHI());
- return PHI.getOperand(Index * 2 + 2).getMBB();
-}
-
-static void setPhiPred(MachineInstr &PHI, unsigned Index,
- MachineBasicBlock *NewPred) {
- PHI.getOperand(Index * 2 + 2).setMBB(NewPred);
-}
-
-static unsigned getPHISourceReg(MachineInstr &PHI, unsigned Index) {
- assert(PHI.isPHI());
- return PHI.getOperand(Index * 2 + 1).getReg();
-}
-
-static unsigned getPHIDestReg(MachineInstr &PHI) {
- assert(PHI.isPHI());
- return PHI.getOperand(0).getReg();
-}
-
-namespace {
-
-class RegionMRT;
-class MBBMRT;
-
-class LinearizedRegion {
-protected:
- MachineBasicBlock *Entry;
- // The exit block is part of the region, and is the last
- // merge block before exiting the region.
- MachineBasicBlock *Exit;
- DenseSet<unsigned> LiveOuts;
- SmallPtrSet<MachineBasicBlock *, 1> MBBs;
- bool HasLoop;
- LinearizedRegion *Parent;
- RegionMRT *RMRT;
-
- void storeLiveOutReg(MachineBasicBlock *MBB, Register Reg,
- MachineInstr *DefInstr, const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI, PHILinearize &PHIInfo);
-
- void storeLiveOutRegRegion(RegionMRT *Region, Register Reg,
- MachineInstr *DefInstr,
- const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI,
- PHILinearize &PHIInfo);
-
- void storeMBBLiveOuts(MachineBasicBlock *MBB, const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI, PHILinearize &PHIInfo,
- RegionMRT *TopRegion);
-
- void storeLiveOuts(MachineBasicBlock *MBB, const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI, PHILinearize &PHIInfo);
-
- void storeLiveOuts(RegionMRT *Region, const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI, PHILinearize &PHIInfo,
- RegionMRT *TopRegion = nullptr);
-
-public:
- LinearizedRegion();
- LinearizedRegion(MachineBasicBlock *MBB, const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI, PHILinearize &PHIInfo);
- ~LinearizedRegion() = default;
-
- void setRegionMRT(RegionMRT *Region) { RMRT = Region; }
-
- RegionMRT *getRegionMRT() { return RMRT; }
-
- void setParent(LinearizedRegion *P) { Parent = P; }
-
- LinearizedRegion *getParent() { return Parent; }
-
- void print(raw_ostream &OS, const TargetRegisterInfo *TRI = nullptr);
-
- void setBBSelectRegIn(unsigned Reg);
-
- unsigned getBBSelectRegIn();
-
- void setBBSelectRegOut(unsigned Reg, bool IsLiveOut);
-
- unsigned getBBSelectRegOut();
-
- void setHasLoop(bool Value);
-
- bool getHasLoop();
-
- void addLiveOut(unsigned VReg);
-
- void removeLiveOut(unsigned Reg);
-
- void replaceLiveOut(unsigned OldReg, unsigned NewReg);
-
- void replaceRegister(unsigned Register, class Register NewRegister,
- MachineRegisterInfo *MRI, bool ReplaceInside,
- bool ReplaceOutside, bool IncludeLoopPHIs);
-
- void replaceRegisterInsideRegion(unsigned Register, unsigned NewRegister,
- bool IncludeLoopPHIs,
- MachineRegisterInfo *MRI);
-
- void replaceRegisterOutsideRegion(unsigned Register, unsigned NewRegister,
- bool IncludeLoopPHIs,
- MachineRegisterInfo *MRI);
-
- DenseSet<unsigned> *getLiveOuts();
-
- void setEntry(MachineBasicBlock *NewEntry);
-
- MachineBasicBlock *getEntry();
-
- void setExit(MachineBasicBlock *NewExit);
-
- MachineBasicBlock *getExit();
-
- void addMBB(MachineBasicBlock *MBB);
-
- void addMBBs(LinearizedRegion *InnerRegion);
-
- bool contains(MachineBasicBlock *MBB);
-
- bool isLiveOut(unsigned Reg);
-
- bool hasNoDef(unsigned Reg, MachineRegisterInfo *MRI);
-
- void removeFalseRegisterKills(MachineRegisterInfo *MRI);
-
- void initLiveOut(RegionMRT *Region, const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI, PHILinearize &PHIInfo);
-};
-
-class MRT {
-protected:
- RegionMRT *Parent;
- unsigned BBSelectRegIn;
- unsigned BBSelectRegOut;
-
-public:
- virtual ~MRT() = default;
-
- unsigned getBBSelectRegIn() { return BBSelectRegIn; }
-
- unsigned getBBSelectRegOut() { return BBSelectRegOut; }
-
- void setBBSelectRegIn(unsigned Reg) { BBSelectRegIn = Reg; }
-
- void setBBSelectRegOut(unsigned Reg) { BBSelectRegOut = Reg; }
-
- virtual RegionMRT *getRegionMRT() { return nullptr; }
-
- virtual MBBMRT *getMBBMRT() { return nullptr; }
-
- bool isRegion() { return getRegionMRT() != nullptr; }
-
- bool isMBB() { return getMBBMRT() != nullptr; }
-
- bool isRoot() { return Parent == nullptr; }
-
- void setParent(RegionMRT *Region) { Parent = Region; }
-
- RegionMRT *getParent() { return Parent; }
-
- static MachineBasicBlock *
- initializeMRT(MachineFunction &MF, const MachineRegionInfo *RegionInfo,
- DenseMap<MachineRegion *, RegionMRT *> &RegionMap);
-
- static RegionMRT *buildMRT(MachineFunction &MF,
- const MachineRegionInfo *RegionInfo,
- const SIInstrInfo *TII,
- MachineRegisterInfo *MRI);
-
- virtual void dump(const TargetRegisterInfo *TRI, int depth = 0) = 0;
-
- void dumpDepth(int depth) {
- for (int i = depth; i > 0; --i) {
- dbgs() << " ";
- }
- }
-};
-
-class MBBMRT : public MRT {
- MachineBasicBlock *MBB;
-
-public:
- MBBMRT(MachineBasicBlock *BB) : MBB(BB) {
- setParent(nullptr);
- setBBSelectRegOut(0);
- setBBSelectRegIn(0);
- }
-
- MBBMRT *getMBBMRT() override { return this; }
-
- MachineBasicBlock *getMBB() { return MBB; }
-
- void dump(const TargetRegisterInfo *TRI, int depth = 0) override {
- dumpDepth(depth);
- dbgs() << "MBB: " << getMBB()->getNumber();
- dbgs() << " In: " << printReg(getBBSelectRegIn(), TRI);
- dbgs() << ", Out: " << printReg(getBBSelectRegOut(), TRI) << "\n";
- }
-};
-
-class RegionMRT : public MRT {
-protected:
- MachineRegion *Region;
- LinearizedRegion *LRegion = nullptr;
- MachineBasicBlock *Succ = nullptr;
- SetVector<MRT *> Children;
-
-public:
- RegionMRT(MachineRegion *MachineRegion) : Region(MachineRegion) {
- setParent(nullptr);
- setBBSelectRegOut(0);
- setBBSelectRegIn(0);
- }
-
- ~RegionMRT() override {
- if (LRegion) {
- delete LRegion;
- }
-
- for (auto *CI : Children) {
- delete &(*CI);
- }
- }
-
- RegionMRT *getRegionMRT() override { return this; }
-
- void setLinearizedRegion(LinearizedRegion *LinearizeRegion) {
- LRegion = LinearizeRegion;
- }
-
- LinearizedRegion *getLinearizedRegion() { return LRegion; }
-
- MachineRegion *getMachineRegion() { return Region; }
-
- unsigned getInnerOutputRegister() {
- return (*(Children.begin()))->getBBSelectRegOut();
- }
-
- void addChild(MRT *Tree) { Children.insert(Tree); }
-
- SetVector<MRT *> *getChildren() { return &Children; }
-
- void dump(const TargetRegisterInfo *TRI, int depth = 0) override {
- dumpDepth(depth);
- dbgs() << "Region: " << (void *)Region;
- dbgs() << " In: " << printReg(getBBSelectRegIn(), TRI);
- dbgs() << ", Out: " << printReg(getBBSelectRegOut(), TRI) << "\n";
-
- dumpDepth(depth);
- if (getSucc())
- dbgs() << "Succ: " << getSucc()->getNumber() << "\n";
- else
- dbgs() << "Succ: none \n";
- for (auto *MRTI : Children) {
- MRTI->dump(TRI, depth + 1);
- }
- }
-
- MRT *getEntryTree() { return Children.back(); }
-
- MRT *getExitTree() { return Children.front(); }
-
- MachineBasicBlock *getEntry() {
- MRT *Tree = Children.back();
- return (Tree->isRegion()) ? Tree->getRegionMRT()->getEntry()
- : Tree->getMBBMRT()->getMBB();
- }
-
- MachineBasicBlock *getExit() {
- MRT *Tree = Children.front();
- return (Tree->isRegion()) ? Tree->getRegionMRT()->getExit()
- : Tree->getMBBMRT()->getMBB();
- }
-
- void setSucc(MachineBasicBlock *MBB) { Succ = MBB; }
-
- MachineBasicBlock *getSucc() { return Succ; }
-
- bool contains(MachineBasicBlock *MBB) {
- for (auto *CI : Children) {
- if (CI->isMBB()) {
- if (MBB == CI->getMBBMRT()->getMBB())
- return true;
- } else {
- if (CI->getRegionMRT()->contains(MBB))
- return true;
- if (CI->getRegionMRT()->getLinearizedRegion() != nullptr &&
- CI->getRegionMRT()->getLinearizedRegion()->contains(MBB))
- return true;
- }
- }
- return false;
- }
-
- void replaceLiveOutReg(unsigned Register, unsigned NewRegister) {
- LinearizedRegion *LRegion = getLinearizedRegion();
- LRegion->replaceLiveOut(Register, NewRegister);
- for (auto &CI : Children) {
- if (CI->isRegion()) {
- CI->getRegionMRT()->replaceLiveOutReg(Register, NewRegister);
- }
- }
- }
-};
-
-} // end anonymous namespace
-
-static unsigned createBBSelectReg(const SIInstrInfo *TII,
- MachineRegisterInfo *MRI) {
- return MRI->createVirtualRegister(TII->getPreferredSelectRegClass(32));
-}
-
-MachineBasicBlock *
-MRT::initializeMRT(MachineFunction &MF, const MachineRegionInfo *RegionInfo,
- DenseMap<MachineRegion *, RegionMRT *> &RegionMap) {
- for (auto &MFI : MF) {
- MachineBasicBlock *ExitMBB = &MFI;
- if (ExitMBB->succ_empty()) {
- return ExitMBB;
- }
- }
- llvm_unreachable("CFG has no exit block");
- return nullptr;
-}
-
-RegionMRT *MRT::buildMRT(MachineFunction &MF,
- const MachineRegionInfo *RegionInfo,
- const SIInstrInfo *TII, MachineRegisterInfo *MRI) {
- SmallPtrSet<MachineRegion *, 4> PlacedRegions;
- DenseMap<MachineRegion *, RegionMRT *> RegionMap;
- MachineRegion *TopLevelRegion = RegionInfo->getTopLevelRegion();
- RegionMRT *Result = new RegionMRT(TopLevelRegion);
- RegionMap[TopLevelRegion] = Result;
-
- // Insert the exit block first, we need it to be the merge node
- // for the top level region.
- MachineBasicBlock *Exit = initializeMRT(MF, RegionInfo, RegionMap);
-
- unsigned BBSelectRegIn = createBBSelectReg(TII, MRI);
- MBBMRT *ExitMRT = new MBBMRT(Exit);
- RegionMap[RegionInfo->getRegionFor(Exit)]->addChild(ExitMRT);
- ExitMRT->setBBSelectRegIn(BBSelectRegIn);
-
- for (auto *MBBI : post_order(&(MF.front()))) {
- MachineBasicBlock *MBB = &(*MBBI);
-
- // Skip Exit since we already added it
- if (MBB == Exit) {
- continue;
- }
-
- LLVM_DEBUG(dbgs() << "Visiting " << printMBBReference(*MBB) << "\n");
- MBBMRT *NewMBB = new MBBMRT(MBB);
- MachineRegion *Region = RegionInfo->getRegionFor(MBB);
-
- // Ensure we have the MRT region
- if (RegionMap.count(Region) == 0) {
- RegionMRT *NewMRTRegion = new RegionMRT(Region);
- RegionMap[Region] = NewMRTRegion;
-
- // Ensure all parents are in the RegionMap
- MachineRegion *Parent = Region->getParent();
- while (RegionMap.count(Parent) == 0) {
- RegionMRT *NewMRTParent = new RegionMRT(Parent);
- NewMRTParent->addChild(NewMRTRegion);
- NewMRTRegion->setParent(NewMRTParent);
- RegionMap[Parent] = NewMRTParent;
- NewMRTRegion = NewMRTParent;
- Parent = Parent->getParent();
- }
- RegionMap[Parent]->addChild(NewMRTRegion);
- NewMRTRegion->setParent(RegionMap[Parent]);
- }
-
- // Add MBB to Region MRT
- RegionMap[Region]->addChild(NewMBB);
- NewMBB->setParent(RegionMap[Region]);
- RegionMap[Region]->setSucc(Region->getExit());
- }
- return Result;
-}
-
-void LinearizedRegion::storeLiveOutReg(MachineBasicBlock *MBB, Register Reg,
- MachineInstr *DefInstr,
- const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI,
- PHILinearize &PHIInfo) {
- if (Reg.isVirtual()) {
- LLVM_DEBUG(dbgs() << "Considering Register: " << printReg(Reg, TRI)
- << "\n");
- // If this is a source register to a PHI we are chaining, it
- // must be live out.
- if (PHIInfo.isSource(Reg)) {
- LLVM_DEBUG(dbgs() << "Add LiveOut (PHI): " << printReg(Reg, TRI) << "\n");
- addLiveOut(Reg);
- } else {
- // If this is live out of the MBB
- for (auto &UI : MRI->use_operands(Reg)) {
- if (UI.getParent()->getParent() != MBB) {
- LLVM_DEBUG(dbgs() << "Add LiveOut (MBB " << printMBBReference(*MBB)
- << "): " << printReg(Reg, TRI) << "\n");
- addLiveOut(Reg);
- } else {
- // If the use is in the same MBB we have to make sure
- // it is after the def, otherwise it is live out in a loop
- MachineInstr *UseInstr = UI.getParent();
- for (MachineBasicBlock::instr_iterator
- MII = UseInstr->getIterator(),
- MIE = UseInstr->getParent()->instr_end();
- MII != MIE; ++MII) {
- if ((&(*MII)) == DefInstr) {
- LLVM_DEBUG(dbgs() << "Add LiveOut (Loop): " << printReg(Reg, TRI)
- << "\n");
- addLiveOut(Reg);
- }
- }
- }
- }
- }
- }
-}
-
-void LinearizedRegion::storeLiveOutRegRegion(RegionMRT *Region, Register Reg,
- MachineInstr *DefInstr,
- const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI,
- PHILinearize &PHIInfo) {
- if (Reg.isVirtual()) {
- LLVM_DEBUG(dbgs() << "Considering Register: " << printReg(Reg, TRI)
- << "\n");
- for (auto &UI : MRI->use_operands(Reg)) {
- if (!Region->contains(UI.getParent()->getParent())) {
- LLVM_DEBUG(dbgs() << "Add LiveOut (Region " << (void *)Region
- << "): " << printReg(Reg, TRI) << "\n");
- addLiveOut(Reg);
- }
- }
- }
-}
-
-void LinearizedRegion::storeLiveOuts(MachineBasicBlock *MBB,
- const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI,
- PHILinearize &PHIInfo) {
- LLVM_DEBUG(dbgs() << "-Store Live Outs Begin (" << printMBBReference(*MBB)
- << ")-\n");
- for (auto &II : *MBB) {
- for (auto &RI : II.defs()) {
- storeLiveOutReg(MBB, RI.getReg(), RI.getParent(), MRI, TRI, PHIInfo);
- }
- for (auto &IRI : II.implicit_operands()) {
- if (IRI.isDef()) {
- storeLiveOutReg(MBB, IRI.getReg(), IRI.getParent(), MRI, TRI, PHIInfo);
- }
- }
- }
-
- // If we have a successor with a PHI, source coming from this MBB we have to
- // add the register as live out
- for (MachineBasicBlock *Succ : MBB->successors()) {
- for (auto &II : *Succ) {
- if (II.isPHI()) {
- MachineInstr &PHI = II;
- int numPreds = getPHINumInputs(PHI);
- for (int i = 0; i < numPreds; ++i) {
- if (getPHIPred(PHI, i) == MBB) {
- unsigned PHIReg = getPHISourceReg(PHI, i);
- LLVM_DEBUG(dbgs()
- << "Add LiveOut (PhiSource " << printMBBReference(*MBB)
- << " -> " << printMBBReference(*Succ)
- << "): " << printReg(PHIReg, TRI) << "\n");
- addLiveOut(PHIReg);
- }
- }
- }
- }
- }
-
- LLVM_DEBUG(dbgs() << "-Store Live Outs Endn-\n");
-}
-
-void LinearizedRegion::storeMBBLiveOuts(MachineBasicBlock *MBB,
- const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI,
- PHILinearize &PHIInfo,
- RegionMRT *TopRegion) {
- for (auto &II : *MBB) {
- for (auto &RI : II.defs()) {
- storeLiveOutRegRegion(TopRegion, RI.getReg(), RI.getParent(), MRI, TRI,
- PHIInfo);
- }
- for (auto &IRI : II.implicit_operands()) {
- if (IRI.isDef()) {
- storeLiveOutRegRegion(TopRegion, IRI.getReg(), IRI.getParent(), MRI,
- TRI, PHIInfo);
- }
- }
- }
-}
-
-void LinearizedRegion::storeLiveOuts(RegionMRT *Region,
- const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI,
- PHILinearize &PHIInfo,
- RegionMRT *CurrentTopRegion) {
- MachineBasicBlock *Exit = Region->getSucc();
-
- RegionMRT *TopRegion =
- CurrentTopRegion == nullptr ? Region : CurrentTopRegion;
-
- // Check if exit is end of function, if so, no live outs.
- if (Exit == nullptr)
- return;
-
- auto Children = Region->getChildren();
- for (auto *CI : *Children) {
- if (CI->isMBB()) {
- auto MBB = CI->getMBBMRT()->getMBB();
- storeMBBLiveOuts(MBB, MRI, TRI, PHIInfo, TopRegion);
- } else {
- LinearizedRegion *SubRegion = CI->getRegionMRT()->getLinearizedRegion();
- // We should be limited to only store registers that are live out from the
- // linearized region
- for (auto *MBBI : SubRegion->MBBs) {
- storeMBBLiveOuts(MBBI, MRI, TRI, PHIInfo, TopRegion);
- }
- }
- }
-
- if (CurrentTopRegion == nullptr) {
- auto Succ = Region->getSucc();
- for (auto &II : *Succ) {
- if (II.isPHI()) {
- MachineInstr &PHI = II;
- int numPreds = getPHINumInputs(PHI);
- for (int i = 0; i < numPreds; ++i) {
- if (Region->contains(getPHIPred(PHI, i))) {
- unsigned PHIReg = getPHISourceReg(PHI, i);
- LLVM_DEBUG(dbgs() << "Add Region LiveOut (" << (void *)Region
- << "): " << printReg(PHIReg, TRI) << "\n");
- addLiveOut(PHIReg);
- }
- }
- }
- }
- }
-}
-
-#ifndef NDEBUG
-void LinearizedRegion::print(raw_ostream &OS, const TargetRegisterInfo *TRI) {
- OS << "Linearized Region {";
- bool IsFirst = true;
- for (auto *MBB : MBBs) {
- if (IsFirst) {
- IsFirst = false;
- } else {
- OS << " ,";
- }
- OS << MBB->getNumber();
- }
- OS << "} (" << Entry->getNumber() << ", "
- << (Exit == nullptr ? -1 : Exit->getNumber())
- << "): In:" << printReg(getBBSelectRegIn(), TRI)
- << " Out:" << printReg(getBBSelectRegOut(), TRI) << " {";
- for (auto &LI : LiveOuts) {
- OS << printReg(LI, TRI) << " ";
- }
- OS << "} \n";
-}
-#endif
-
-unsigned LinearizedRegion::getBBSelectRegIn() {
- return getRegionMRT()->getBBSelectRegIn();
-}
-
-unsigned LinearizedRegion::getBBSelectRegOut() {
- return getRegionMRT()->getBBSelectRegOut();
-}
-
-void LinearizedRegion::setHasLoop(bool Value) { HasLoop = Value; }
-
-bool LinearizedRegion::getHasLoop() { return HasLoop; }
-
-void LinearizedRegion::addLiveOut(unsigned VReg) { LiveOuts.insert(VReg); }
-
-void LinearizedRegion::removeLiveOut(unsigned Reg) {
- if (isLiveOut(Reg))
- LiveOuts.erase(Reg);
-}
-
-void LinearizedRegion::replaceLiveOut(unsigned OldReg, unsigned NewReg) {
- if (isLiveOut(OldReg)) {
- removeLiveOut(OldReg);
- addLiveOut(NewReg);
- }
-}
-
-void LinearizedRegion::replaceRegister(unsigned Register,
- class Register NewRegister,
- MachineRegisterInfo *MRI,
- bool ReplaceInside, bool ReplaceOutside,
- bool IncludeLoopPHI) {
- assert(Register != NewRegister && "Cannot replace a reg with itself");
-
- LLVM_DEBUG(
- dbgs() << "Preparing to replace register (region): "
- << printReg(Register, MRI->getTargetRegisterInfo()) << " with "
- << printReg(NewRegister, MRI->getTargetRegisterInfo()) << "\n");
-
- // If we are replacing outside, we also need to update the LiveOuts
- if (ReplaceOutside &&
- (isLiveOut(Register) || this->getParent()->isLiveOut(Register))) {
- LinearizedRegion *Current = this;
- while (Current != nullptr && Current->getEntry() != nullptr) {
- LLVM_DEBUG(dbgs() << "Region before register replace\n");
- LLVM_DEBUG(Current->print(dbgs(), MRI->getTargetRegisterInfo()));
- Current->replaceLiveOut(Register, NewRegister);
- LLVM_DEBUG(dbgs() << "Region after register replace\n");
- LLVM_DEBUG(Current->print(dbgs(), MRI->getTargetRegisterInfo()));
- Current = Current->getParent();
- }
- }
-
- for (MachineRegisterInfo::reg_iterator I = MRI->reg_begin(Register),
- E = MRI->reg_end();
- I != E;) {
- MachineOperand &O = *I;
- ++I;
-
- // We don't rewrite defs.
- if (O.isDef())
- continue;
-
- bool IsInside = contains(O.getParent()->getParent());
- bool IsLoopPHI = IsInside && (O.getParent()->isPHI() &&
- O.getParent()->getParent() == getEntry());
- bool ShouldReplace = (IsInside && ReplaceInside) ||
- (!IsInside && ReplaceOutside) ||
- (IncludeLoopPHI && IsLoopPHI);
- if (ShouldReplace) {
-
- if (NewRegister.isPhysical()) {
- LLVM_DEBUG(dbgs() << "Trying to substitute physical register: "
- << printReg(NewRegister, MRI->getTargetRegisterInfo())
- << "\n");
- llvm_unreachable("Cannot substitute physical registers");
- } else {
- LLVM_DEBUG(dbgs() << "Replacing register (region): "
- << printReg(Register, MRI->getTargetRegisterInfo())
- << " with "
- << printReg(NewRegister, MRI->getTargetRegisterInfo())
- << "\n");
- O.setReg(NewRegister);
- }
- }
- }
-}
-
-void LinearizedRegion::replaceRegisterInsideRegion(unsigned Register,
- unsigned NewRegister,
- bool IncludeLoopPHIs,
- MachineRegisterInfo *MRI) {
- replaceRegister(Register, NewRegister, MRI, true, false, IncludeLoopPHIs);
-}
-
-void LinearizedRegion::replaceRegisterOutsideRegion(unsigned Register,
- unsigned NewRegister,
- bool IncludeLoopPHIs,
- MachineRegisterInfo *MRI) {
- replaceRegister(Register, NewRegister, MRI, false, true, IncludeLoopPHIs);
-}
-
-DenseSet<unsigned> *LinearizedRegion::getLiveOuts() { return &LiveOuts; }
-
-void LinearizedRegion::setEntry(MachineBasicBlock *NewEntry) {
- Entry = NewEntry;
-}
-
-MachineBasicBlock *LinearizedRegion::getEntry() { return Entry; }
-
-void LinearizedRegion::setExit(MachineBasicBlock *NewExit) { Exit = NewExit; }
-
-MachineBasicBlock *LinearizedRegion::getExit() { return Exit; }
-
-void LinearizedRegion::addMBB(MachineBasicBlock *MBB) { MBBs.insert(MBB); }
-
-void LinearizedRegion::addMBBs(LinearizedRegion *InnerRegion) {
- for (auto *MBB : InnerRegion->MBBs) {
- addMBB(MBB);
- }
-}
-
-bool LinearizedRegion::contains(MachineBasicBlock *MBB) {
- return MBBs.contains(MBB);
-}
-
-bool LinearizedRegion::isLiveOut(unsigned Reg) {
- return LiveOuts.contains(Reg);
-}
-
-bool LinearizedRegion::hasNoDef(unsigned Reg, MachineRegisterInfo *MRI) {
- return MRI->def_begin(Reg) == MRI->def_end();
-}
-
-// After the code has been structurized, what was flagged as kills
-// before are no longer register kills.
-void LinearizedRegion::removeFalseRegisterKills(MachineRegisterInfo *MRI) {
- const TargetRegisterInfo *TRI = MRI->getTargetRegisterInfo();
- (void)TRI; // It's used by LLVM_DEBUG.
-
- for (auto *MBBI : MBBs) {
- MachineBasicBlock *MBB = MBBI;
- for (auto &II : *MBB) {
- for (auto &RI : II.uses()) {
- if (RI.isReg()) {
- Register Reg = RI.getReg();
- if (Reg.isVirtual()) {
- if (hasNoDef(Reg, MRI))
- continue;
- if (!MRI->hasOneDef(Reg)) {
- LLVM_DEBUG(this->getEntry()->getParent()->dump());
- LLVM_DEBUG(dbgs() << printReg(Reg, TRI) << "\n");
- }
-
- if (MRI->def_begin(Reg) == MRI->def_end()) {
- LLVM_DEBUG(dbgs() << "Register "
- << printReg(Reg, MRI->getTargetRegisterInfo())
- << " has NO defs\n");
- } else if (!MRI->hasOneDef(Reg)) {
- LLVM_DEBUG(dbgs() << "Register "
- << printReg(Reg, MRI->getTargetRegisterInfo())
- << " has multiple defs\n");
- }
-
- assert(MRI->hasOneDef(Reg) && "Register has multiple definitions");
- MachineOperand *Def = &(*(MRI->def_begin(Reg)));
- MachineOperand *UseOperand = &(RI);
- bool UseIsOutsideDefMBB = Def->getParent()->getParent() != MBB;
- if (UseIsOutsideDefMBB && UseOperand->isKill()) {
- LLVM_DEBUG(dbgs() << "Removing kill flag on register: "
- << printReg(Reg, TRI) << "\n");
- UseOperand->setIsKill(false);
- }
- }
- }
- }
- }
- }
-}
-
-void LinearizedRegion::initLiveOut(RegionMRT *Region,
- const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI,
- PHILinearize &PHIInfo) {
- storeLiveOuts(Region, MRI, TRI, PHIInfo);
-}
-
-LinearizedRegion::LinearizedRegion(MachineBasicBlock *MBB,
- const MachineRegisterInfo *MRI,
- const TargetRegisterInfo *TRI,
- PHILinearize &PHIInfo) {
- setEntry(MBB);
- setExit(MBB);
- storeLiveOuts(MBB, MRI, TRI, PHIInfo);
- MBBs.insert(MBB);
- Parent = nullptr;
-}
-
-LinearizedRegion::LinearizedRegion() {
- setEntry(nullptr);
- setExit(nullptr);
- Parent = nullptr;
-}
-
-namespace {
-
-class AMDGPUMachineCFGStructurizer : public MachineFunctionPass {
-private:
- const MachineRegionInfo *Regions;
- const SIInstrInfo *TII;
- const TargetRegisterInfo *TRI;
- MachineRegisterInfo *MRI;
- PHILinearize PHIInfo;
- DenseMap<MachineBasicBlock *, MachineBasicBlock *> FallthroughMap;
- RegionMRT *RMRT;
-
- void getPHIRegionIndices(RegionMRT *Region, MachineInstr &PHI,
- SmallVector<unsigned, 2> &RegionIndices);
- void getPHIRegionIndices(LinearizedRegion *Region, MachineInstr &PHI,
- SmallVector<unsigned, 2> &RegionIndices);
- void getPHINonRegionIndices(LinearizedRegion *Region, MachineInstr &PHI,
- SmallVector<unsigned, 2> &PHINonRegionIndices);
-
- void storePHILinearizationInfoDest(
- unsigned LDestReg, MachineInstr &PHI,
- SmallVector<unsigned, 2> *RegionIndices = nullptr);
-
- unsigned storePHILinearizationInfo(MachineInstr &PHI,
- SmallVector<unsigned, 2> *RegionIndices);
-
- void extractKilledPHIs(MachineBasicBlock *MBB);
-
- bool shrinkPHI(MachineInstr &PHI, SmallVector<unsigned, 2> &PHIIndices,
- unsigned *ReplaceReg);
-
- bool shrinkPHI(MachineInstr &PHI, unsigned CombinedSourceReg,
- MachineBasicBlock *SourceMBB,
- SmallVector<unsigned, 2> &PHIIndices, unsigned *ReplaceReg);
-
- void replacePHI(MachineInstr &PHI, unsigned CombinedSourceReg,
- MachineBasicBlock *LastMerge,
- SmallVector<unsigned, 2> &PHIRegionIndices);
- void replaceEntryPHI(MachineInstr &PHI, unsigned CombinedSourceReg,
- MachineBasicBlock *IfMBB,
- SmallVector<unsigned, 2> &PHIRegionIndices);
- void replaceLiveOutRegs(MachineInstr &PHI,
- SmallVector<unsigned, 2> &PHIRegionIndices,
- unsigned CombinedSourceReg,
- LinearizedRegion *LRegion);
- void rewriteRegionExitPHI(RegionMRT *Region, MachineBasicBlock *LastMerge,
- MachineInstr &PHI, LinearizedRegion *LRegion);
-
- void rewriteRegionExitPHIs(RegionMRT *Region, MachineBasicBlock *LastMerge,
- LinearizedRegion *LRegion);
- void rewriteRegionEntryPHI(LinearizedRegion *Region, MachineBasicBlock *IfMBB,
- MachineInstr &PHI);
- void rewriteRegionEntryPHIs(LinearizedRegion *Region,
- MachineBasicBlock *IfMBB);
-
- bool regionIsSimpleIf(RegionMRT *Region);
-
- void transformSimpleIfRegion(RegionMRT *Region);
-
- void insertUnconditionalBranch(MachineBasicBlock *MBB,
- MachineBasicBlock *Dest,
- const DebugLoc &DL = DebugLoc());
-
- MachineBasicBlock *createLinearizedExitBlock(RegionMRT *Region);
-
- void insertMergePHI(MachineBasicBlock *IfBB, MachineBasicBlock *CodeBB,
- MachineBasicBlock *MergeBB, unsigned DestRegister,
- unsigned IfSourceRegister, unsigned CodeSourceRegister,
- bool IsUndefIfSource = false);
-
- MachineBasicBlock *createIfBlock(MachineBasicBlock *MergeBB,
- MachineBasicBlock *CodeBBStart,
- MachineBasicBlock *CodeBBEnd,
- MachineBasicBlock *SelectBB, unsigned IfReg,
- bool InheritPreds);
-
- void prunePHIInfo(MachineBasicBlock *MBB);
- void createEntryPHI(LinearizedRegion *CurrentRegion, unsigned DestReg);
-
- void createEntryPHIs(LinearizedRegion *CurrentRegion);
- void resolvePHIInfos(MachineBasicBlock *FunctionEntry);
-
- void replaceRegisterWith(unsigned Register, class Register NewRegister);
-
- MachineBasicBlock *createIfRegion(MachineBasicBlock *MergeBB,
- MachineBasicBlock *CodeBB,
- LinearizedRegion *LRegion,
- unsigned BBSelectRegIn,
- unsigned BBSelectRegOut);
-
- MachineBasicBlock *
- createIfRegion(MachineBasicBlock *MergeMBB, LinearizedRegion *InnerRegion,
- LinearizedRegion *CurrentRegion, MachineBasicBlock *SelectBB,
- unsigned BBSelectRegIn, unsigned BBSelectRegOut);
- void ensureCondIsNotKilled(SmallVector<MachineOperand, 1> Cond);
-
- void rewriteCodeBBTerminator(MachineBasicBlock *CodeBB,
- MachineBasicBlock *MergeBB,
- unsigned BBSelectReg);
-
- MachineInstr *getDefInstr(unsigned Reg);
- void insertChainedPHI(MachineBasicBlock *IfBB, MachineBasicBlock *CodeBB,
- MachineBasicBlock *MergeBB,
- LinearizedRegion *InnerRegion, unsigned DestReg,
- unsigned SourceReg);
- bool containsDef(MachineBasicBlock *MBB, LinearizedRegion *InnerRegion,
- unsigned Register);
- void rewriteLiveOutRegs(MachineBasicBlock *IfBB, MachineBasicBlock *CodeBB,
- MachineBasicBlock *MergeBB,
- LinearizedRegion *InnerRegion,
- LinearizedRegion *LRegion);
-
- void splitLoopPHI(MachineInstr &PHI, MachineBasicBlock *Entry,
- MachineBasicBlock *EntrySucc, LinearizedRegion *LRegion);
- void splitLoopPHIs(MachineBasicBlock *Entry, MachineBasicBlock *EntrySucc,
- LinearizedRegion *LRegion);
-
- MachineBasicBlock *splitExit(LinearizedRegion *LRegion);
-
- MachineBasicBlock *splitEntry(LinearizedRegion *LRegion);
-
- LinearizedRegion *initLinearizedRegion(RegionMRT *Region);
-
- bool structurizeComplexRegion(RegionMRT *Region);
-
- bool structurizeRegion(RegionMRT *Region);
-
- bool structurizeRegions(RegionMRT *Region, bool isTopRegion);
-
-public:
- static char ID;
-
- AMDGPUMachineCFGStructurizer() : MachineFunctionPass(ID) {
- initializeAMDGPUMachineCFGStructurizerPass(*PassRegistry::getPassRegistry());
- }
-
- void getAnalysisUsage(AnalysisUsage &AU) const override {
- AU.addRequired<MachineRegionInfoPass>();
- MachineFunctionPass::getAnalysisUsage(AU);
- }
-
- void initFallthroughMap(MachineFunction &MF);
-
- void createLinearizedRegion(RegionMRT *Region, unsigned SelectOut);
-
- unsigned initializeSelectRegisters(MRT *MRT, unsigned ExistingExitReg,
- MachineRegisterInfo *MRI,
- const SIInstrInfo *TII);
-
- void setRegionMRT(RegionMRT *RegionTree) { RMRT = RegionTree; }
-
- RegionMRT *getRegionMRT() { return RMRT; }
-
- bool runOnMachineFunction(MachineFunction &MF) override;
-};
-
-} // end anonymous namespace
-
-char AMDGPUMachineCFGStructurizer::ID = 0;
-
-bool AMDGPUMachineCFGStructurizer::regionIsSimpleIf(RegionMRT *Region) {
- MachineBasicBlock *Entry = Region->getEntry();
- MachineBasicBlock *Succ = Region->getSucc();
- bool FoundBypass = false;
- bool FoundIf = false;
-
- if (Entry->succ_size() != 2) {
- return false;
- }
-
- for (MachineBasicBlock *Current : Entry->successors()) {
- if (Current == Succ) {
- FoundBypass = true;
- } else if ((Current->succ_size() == 1) &&
- *(Current->succ_begin()) == Succ) {
- FoundIf = true;
- }
- }
-
- return FoundIf && FoundBypass;
-}
-
-void AMDGPUMachineCFGStructurizer::transformSimpleIfRegion(RegionMRT *Region) {
- MachineBasicBlock *Entry = Region->getEntry();
- MachineBasicBlock *Exit = Region->getExit();
- TII->convertNonUniformIfRegion(Entry, Exit);
-}
-
-static void fixMBBTerminator(MachineBasicBlock *MBB) {
- if (MBB->succ_size() == 1) {
- auto *Succ = *(MBB->succ_begin());
- for (auto &TI : MBB->terminators()) {
- for (auto &UI : TI.uses()) {
- if (UI.isMBB() && UI.getMBB() != Succ) {
- UI.setMBB(Succ);
- }
- }
- }
- }
-}
-
-static void fixRegionTerminator(RegionMRT *Region) {
- MachineBasicBlock *InternalSucc = nullptr;
- MachineBasicBlock *ExternalSucc = nullptr;
- LinearizedRegion *LRegion = Region->getLinearizedRegion();
- auto Exit = LRegion->getExit();
-
- SmallPtrSet<MachineBasicBlock *, 2> Successors;
- for (MachineBasicBlock *Succ : Exit->successors()) {
- if (LRegion->contains(Succ)) {
- // Do not allow re-assign
- assert(InternalSucc == nullptr);
- InternalSucc = Succ;
- } else {
- // Do not allow re-assign
- assert(ExternalSucc == nullptr);
- ExternalSucc = Succ;
- }
- }
-
- for (auto &TI : Exit->terminators()) {
- for (auto &UI : TI.uses()) {
- if (UI.isMBB()) {
- auto Target = UI.getMBB();
- if (Target != InternalSucc && Target != ExternalSucc) {
- UI.setMBB(ExternalSucc);
- }
- }
- }
- }
-}
-
-// If a region is just a sequence of regions (and the exit
-// block in the case of the top level region), we can simply skip
-// linearizing it, because it is already linear
-bool regionIsSequence(RegionMRT *Region) {
- auto Children = Region->getChildren();
- for (auto *CI : *Children) {
- if (!CI->isRegion()) {
- if (CI->getMBBMRT()->getMBB()->succ_size() > 1) {
- return false;
- }
- }
- }
- return true;
-}
-
-void fixupRegionExits(RegionMRT *Region) {
- auto Children = Region->getChildren();
- for (auto *CI : *Children) {
- if (!CI->isRegion()) {
- fixMBBTerminator(CI->getMBBMRT()->getMBB());
- } else {
- fixRegionTerminator(CI->getRegionMRT());
- }
- }
-}
-
-void AMDGPUMachineCFGStructurizer::getPHIRegionIndices(
- RegionMRT *Region, MachineInstr &PHI,
- SmallVector<unsigned, 2> &PHIRegionIndices) {
- unsigned NumInputs = getPHINumInputs(PHI);
- for (unsigned i = 0; i < NumInputs; ++i) {
- MachineBasicBlock *Pred = getPHIPred(PHI, i);
- if (Region->contains(Pred)) {
- PHIRegionIndices.push_back(i);
- }
- }
-}
-
-void AMDGPUMachineCFGStructurizer::getPHIRegionIndices(
- LinearizedRegion *Region, MachineInstr &PHI,
- SmallVector<unsigned, 2> &PHIRegionIndices) {
- unsigned NumInputs = getPHINumInputs(PHI);
- for (unsigned i = 0; i < NumInputs; ++i) {
- MachineBasicBlock *Pred = getPHIPred(PHI, i);
- if (Region->contains(Pred)) {
- PHIRegionIndices.push_back(i);
- }
- }
-}
-
-void AMDGPUMachineCFGStructurizer::getPHINonRegionIndices(
- LinearizedRegion *Region, MachineInstr &PHI,
- SmallVector<unsigned, 2> &PHINonRegionIndices) {
- unsigned NumInputs = getPHINumInputs(PHI);
- for (unsigned i = 0; i < NumInputs; ++i) {
- MachineBasicBlock *Pred = getPHIPred(PHI, i);
- if (!Region->contains(Pred)) {
- PHINonRegionIndices.push_back(i);
- }
- }
-}
-
-void AMDGPUMachineCFGStructurizer::storePHILinearizationInfoDest(
- unsigned LDestReg, MachineInstr &PHI,
- SmallVector<unsigned, 2> *RegionIndices) {
- if (RegionIndices) {
- for (auto i : *RegionIndices) {
- PHIInfo.addSource(LDestReg, getPHISourceReg(PHI, i), getPHIPred(PHI, i));
- }
- } else {
- unsigned NumInputs = getPHINumInputs(PHI);
- for (unsigned i = 0; i < NumInputs; ++i) {
- PHIInfo.addSource(LDestReg, getPHISourceReg(PHI, i), getPHIPred(PHI, i));
- }
- }
-}
-
-unsigned AMDGPUMachineCFGStructurizer::storePHILinearizationInfo(
- MachineInstr &PHI, SmallVector<unsigned, 2> *RegionIndices) {
- unsigned DestReg = getPHIDestReg(PHI);
- Register LinearizeDestReg =
- MRI->createVirtualRegister(MRI->getRegClass(DestReg));
- PHIInfo.addDest(LinearizeDestReg, PHI.getDebugLoc());
- storePHILinearizationInfoDest(LinearizeDestReg, PHI, RegionIndices);
- return LinearizeDestReg;
-}
-
-void AMDGPUMachineCFGStructurizer::extractKilledPHIs(MachineBasicBlock *MBB) {
- // We need to create a new chain for the killed phi, but there is no
- // need to do the renaming outside or inside the block.
- SmallPtrSet<MachineInstr *, 2> PHIs;
- for (MachineBasicBlock::instr_iterator I = MBB->instr_begin(),
- E = MBB->instr_end();
- I != E; ++I) {
- MachineInstr &Instr = *I;
- if (Instr.isPHI()) {
- unsigned PHIDestReg = getPHIDestReg(Instr);
- LLVM_DEBUG(dbgs() << "Extracting killed phi:\n");
- LLVM_DEBUG(Instr.dump());
- PHIs.insert(&Instr);
- PHIInfo.addDest(PHIDestReg, Instr.getDebugLoc());
- storePHILinearizationInfoDest(PHIDestReg, Instr);
- }
- }
-
- for (auto *PI : PHIs) {
- PI->eraseFromParent();
- }
-}
-
-static bool isPHIRegionIndex(SmallVector<unsigned, 2> PHIRegionIndices,
- unsigned Index) {
- return llvm::is_contained(PHIRegionIndices, Index);
-}
-
-bool AMDGPUMachineCFGStructurizer::shrinkPHI(MachineInstr &PHI,
- SmallVector<unsigned, 2> &PHIIndices,
- unsigned *ReplaceReg) {
- return shrinkPHI(PHI, 0, nullptr, PHIIndices, ReplaceReg);
-}
-
-bool AMDGPUMachineCFGStructurizer::shrinkPHI(MachineInstr &PHI,
- unsigned CombinedSourceReg,
- MachineBasicBlock *SourceMBB,
- SmallVector<unsigned, 2> &PHIIndices,
- unsigned *ReplaceReg) {
- LLVM_DEBUG(dbgs() << "Shrink PHI: ");
- LLVM_DEBUG(PHI.dump());
- LLVM_DEBUG(dbgs() << " to " << printReg(getPHIDestReg(PHI), TRI)
- << " = PHI(");
-
- bool Replaced = false;
- unsigned NumInputs = getPHINumInputs(PHI);
- int SingleExternalEntryIndex = -1;
- for (unsigned i = 0; i < NumInputs; ++i) {
- if (!isPHIRegionIndex(PHIIndices, i)) {
- if (SingleExternalEntryIndex == -1) {
- // Single entry
- SingleExternalEntryIndex = i;
- } else {
- // Multiple entries
- SingleExternalEntryIndex = -2;
- }
- }
- }
-
- if (SingleExternalEntryIndex > -1) {
- *ReplaceReg = getPHISourceReg(PHI, SingleExternalEntryIndex);
- // We should not rewrite the code, we should only pick up the single value
- // that represents the shrunk PHI.
- Replaced = true;
- } else {
- MachineBasicBlock *MBB = PHI.getParent();
- MachineInstrBuilder MIB =
- BuildMI(*MBB, PHI, PHI.getDebugLoc(), TII->get(TargetOpcode::PHI),
- getPHIDestReg(PHI));
- if (SourceMBB) {
- MIB.addReg(CombinedSourceReg);
- MIB.addMBB(SourceMBB);
- LLVM_DEBUG(dbgs() << printReg(CombinedSourceReg, TRI) << ", "
- << printMBBReference(*SourceMBB));
- }
-
- for (unsigned i = 0; i < NumInputs; ++i) {
- if (isPHIRegionIndex(PHIIndices, i)) {
- continue;
- }
- unsigned SourceReg = getPHISourceReg(PHI, i);
- MachineBasicBlock *SourcePred = getPHIPred(PHI, i);
- MIB.addReg(SourceReg);
- MIB.addMBB(SourcePred);
- LLVM_DEBUG(dbgs() << printReg(SourceReg, TRI) << ", "
- << printMBBReference(*SourcePred));
- }
- LLVM_DEBUG(dbgs() << ")\n");
- }
- PHI.eraseFromParent();
- return Replaced;
-}
-
-void AMDGPUMachineCFGStructurizer::replacePHI(
- MachineInstr &PHI, unsigned CombinedSourceReg, MachineBasicBlock *LastMerge,
- SmallVector<unsigned, 2> &PHIRegionIndices) {
- LLVM_DEBUG(dbgs() << "Replace PHI: ");
- LLVM_DEBUG(PHI.dump());
- LLVM_DEBUG(dbgs() << " with " << printReg(getPHIDestReg(PHI), TRI)
- << " = PHI(");
-
- bool HasExternalEdge = false;
- unsigned NumInputs = getPHINumInputs(PHI);
- for (unsigned i = 0; i < NumInputs; ++i) {
- if (!isPHIRegionIndex(PHIRegionIndices, i)) {
- HasExternalEdge = true;
- }
- }
-
- if (HasExternalEdge) {
- MachineBasicBlock *MBB = PHI.getParent();
- MachineInstrBuilder MIB =
- BuildMI(*MBB, PHI, PHI.getDebugLoc(), TII->get(TargetOpcode::PHI),
- getPHIDestReg(PHI));
- MIB.addReg(CombinedSourceReg);
- MIB.addMBB(LastMerge);
- LLVM_DEBUG(dbgs() << printReg(CombinedSourceReg, TRI) << ", "
- << printMBBReference(*LastMerge));
- for (unsigned i = 0; i < NumInputs; ++i) {
- if (isPHIRegionIndex(PHIRegionIndices, i)) {
- continue;
- }
- unsigned SourceReg = getPHISourceReg(PHI, i);
- MachineBasicBlock *SourcePred = getPHIPred(PHI, i);
- MIB.addReg(SourceReg);
- MIB.addMBB(SourcePred);
- LLVM_DEBUG(dbgs() << printReg(SourceReg, TRI) << ", "
- << printMBBReference(*SourcePred));
- }
- LLVM_DEBUG(dbgs() << ")\n");
- } else {
- replaceRegisterWith(getPHIDestReg(PHI), CombinedSourceReg);
- }
- PHI.eraseFromParent();
-}
-
-void AMDGPUMachineCFGStructurizer::replaceEntryPHI(
- MachineInstr &PHI, unsigned CombinedSourceReg, MachineBasicBlock *IfMBB,
- SmallVector<unsigned, 2> &PHIRegionIndices) {
- LLVM_DEBUG(dbgs() << "Replace entry PHI: ");
- LLVM_DEBUG(PHI.dump());
- LLVM_DEBUG(dbgs() << " with ");
-
- unsigned NumInputs = getPHINumInputs(PHI);
- unsigned NumNonRegionInputs = NumInputs;
- for (unsigned i = 0; i < NumInputs; ++i) {
- if (isPHIRegionIndex(PHIRegionIndices, i)) {
- NumNonRegionInputs--;
- }
- }
-
- if (NumNonRegionInputs == 0) {
- auto DestReg = getPHIDestReg(PHI);
- replaceRegisterWith(DestReg, CombinedSourceReg);
- LLVM_DEBUG(dbgs() << " register " << printReg(CombinedSourceReg, TRI)
- << "\n");
- PHI.eraseFromParent();
- } else {
- LLVM_DEBUG(dbgs() << printReg(getPHIDestReg(PHI), TRI) << " = PHI(");
- MachineBasicBlock *MBB = PHI.getParent();
- MachineInstrBuilder MIB =
- BuildMI(*MBB, PHI, PHI.getDebugLoc(), TII->get(TargetOpcode::PHI),
- getPHIDestReg(PHI));
- MIB.addReg(CombinedSourceReg);
- MIB.addMBB(IfMBB);
- LLVM_DEBUG(dbgs() << printReg(CombinedSourceReg, TRI) << ", "
- << printMBBReference(*IfMBB));
- unsigned NumInputs = getPHINumInputs(PHI);
- for (unsigned i = 0; i < NumInputs; ++i) {
- if (isPHIRegionIndex(PHIRegionIndices, i)) {
- continue;
- }
- unsigned SourceReg = getPHISourceReg(PHI, i);
- MachineBasicBlock *SourcePred = getPHIPred(PHI, i);
- MIB.addReg(SourceReg);
- MIB.addMBB(SourcePred);
- LLVM_DEBUG(dbgs() << printReg(SourceReg, TRI) << ", "
- << printMBBReference(*SourcePred));
- }
- LLVM_DEBUG(dbgs() << ")\n");
- PHI.eraseFromParent();
- }
-}
-
-void AMDGPUMachineCFGStructurizer::replaceLiveOutRegs(
- MachineInstr &PHI, SmallVector<unsigned, 2> &PHIRegionIndices,
- unsigned CombinedSourceReg, LinearizedRegion *LRegion) {
- bool WasLiveOut = false;
- for (auto PII : PHIRegionIndices) {
- unsigned Reg = getPHISourceReg(PHI, PII);
- if (LRegion->isLiveOut(Reg)) {
- bool IsDead = true;
-
- // Check if register is live out of the basic block
- MachineBasicBlock *DefMBB = getDefInstr(Reg)->getParent();
- for (const MachineOperand &MO : MRI->use_operands(Reg))
- if (MO.getParent()->getParent() != DefMBB)
- IsDead = false;
-
- LLVM_DEBUG(dbgs() << "Register " << printReg(Reg, TRI) << " is "
- << (IsDead ? "dead" : "alive")
- << " after PHI replace\n");
- if (IsDead) {
- LRegion->removeLiveOut(Reg);
- }
- WasLiveOut = true;
- }
- }
-
- if (WasLiveOut)
- LRegion->addLiveOut(CombinedSourceReg);
-}
-
-void AMDGPUMachineCFGStructurizer::rewriteRegionExitPHI(RegionMRT *Region,
- MachineBasicBlock *LastMerge,
- MachineInstr &PHI,
- LinearizedRegion *LRegion) {
- SmallVector<unsigned, 2> PHIRegionIndices;
- getPHIRegionIndices(Region, PHI, PHIRegionIndices);
- unsigned LinearizedSourceReg =
- storePHILinearizationInfo(PHI, &PHIRegionIndices);
-
- replacePHI(PHI, LinearizedSourceReg, LastMerge, PHIRegionIndices);
- replaceLiveOutRegs(PHI, PHIRegionIndices, LinearizedSourceReg, LRegion);
-}
-
-void AMDGPUMachineCFGStructurizer::rewriteRegionEntryPHI(LinearizedRegion *Region,
- MachineBasicBlock *IfMBB,
- MachineInstr &PHI) {
- SmallVector<unsigned, 2> PHINonRegionIndices;
- getPHINonRegionIndices(Region, PHI, PHINonRegionIndices);
- unsigned LinearizedSourceReg =
- storePHILinearizationInfo(PHI, &PHINonRegionIndices);
- replaceEntryPHI(PHI, LinearizedSourceReg, IfMBB, PHINonRegionIndices);
-}
-
-static void collectPHIs(MachineBasicBlock *MBB,
- SmallVector<MachineInstr *, 2> &PHIs) {
- for (auto &BBI : *MBB) {
- if (BBI.isPHI()) {
- PHIs.push_back(&BBI);
- }
- }
-}
-
-void AMDGPUMachineCFGStructurizer::rewriteRegionExitPHIs(RegionMRT *Region,
- MachineBasicBlock *LastMerge,
- LinearizedRegion *LRegion) {
- SmallVector<MachineInstr *, 2> PHIs;
- auto Exit = Region->getSucc();
- if (Exit == nullptr)
- return;
-
- collectPHIs(Exit, PHIs);
-
- for (auto *PHII : PHIs) {
- rewriteRegionExitPHI(Region, LastMerge, *PHII, LRegion);
- }
-}
-
-void AMDGPUMachineCFGStructurizer::rewriteRegionEntryPHIs(LinearizedRegion *Region,
- MachineBasicBlock *IfMBB) {
- SmallVector<MachineInstr *, 2> PHIs;
- auto Entry = Region->getEntry();
-
- collectPHIs(Entry, PHIs);
-
- for (auto *PHII : PHIs) {
- rewriteRegionEntryPHI(Region, IfMBB, *PHII);
- }
-}
-
-void AMDGPUMachineCFGStructurizer::insertUnconditionalBranch(MachineBasicBlock *MBB,
- MachineBasicBlock *Dest,
- const DebugLoc &DL) {
- LLVM_DEBUG(dbgs() << "Inserting unconditional branch: " << MBB->getNumber()
- << " -> " << Dest->getNumber() << "\n");
- MachineBasicBlock::instr_iterator Terminator = MBB->getFirstInstrTerminator();
- bool HasTerminator = Terminator != MBB->instr_end();
- if (HasTerminator) {
- TII->ReplaceTailWithBranchTo(Terminator, Dest);
- }
- if (++MachineFunction::iterator(MBB) != MachineFunction::iterator(Dest)) {
- TII->insertUnconditionalBranch(*MBB, Dest, DL);
- }
-}
-
-static MachineBasicBlock *getSingleExitNode(MachineFunction &MF) {
- MachineBasicBlock *result = nullptr;
- for (auto &MFI : MF) {
- if (MFI.succ_empty()) {
- if (result == nullptr) {
- result = &MFI;
- } else {
- return nullptr;
- }
- }
- }
-
- return result;
-}
-
-static bool hasOneExitNode(MachineFunction &MF) {
- return getSingleExitNode(MF) != nullptr;
-}
-
-MachineBasicBlock *
-AMDGPUMachineCFGStructurizer::createLinearizedExitBlock(RegionMRT *Region) {
- auto Exit = Region->getSucc();
-
- // If the exit is the end of the function, we just use the existing
- MachineFunction *MF = Region->getEntry()->getParent();
- if (Exit == nullptr && hasOneExitNode(*MF)) {
- return &(*(--(Region->getEntry()->getParent()->end())));
- }
-
- MachineBasicBlock *LastMerge = MF->CreateMachineBasicBlock();
- if (Exit == nullptr) {
- MachineFunction::iterator ExitIter = MF->end();
- MF->insert(ExitIter, LastMerge);
- } else {
- MachineFunction::iterator ExitIter = Exit->getIterator();
- MF->insert(ExitIter, LastMerge);
- LastMerge->addSuccessor(Exit);
- insertUnconditionalBranch(LastMerge, Exit);
- LLVM_DEBUG(dbgs() << "Created exit block: " << LastMerge->getNumber()
- << "\n");
- }
- return LastMerge;
-}
-
-void AMDGPUMachineCFGStructurizer::insertMergePHI(MachineBasicBlock *IfBB,
- MachineBasicBlock *CodeBB,
- MachineBasicBlock *MergeBB,
- unsigned DestRegister,
- unsigned IfSourceRegister,
- unsigned CodeSourceRegister,
- bool IsUndefIfSource) {
- // If this is the function exit block, we don't need a phi.
- if (MergeBB->succ_empty()) {
- return;
- }
- LLVM_DEBUG(dbgs() << "Merge PHI (" << printMBBReference(*MergeBB)
- << "): " << printReg(DestRegister, TRI) << " = PHI("
- << printReg(IfSourceRegister, TRI) << ", "
- << printMBBReference(*IfBB)
- << printReg(CodeSourceRegister, TRI) << ", "
- << printMBBReference(*CodeBB) << ")\n");
- const DebugLoc &DL = MergeBB->findDebugLoc(MergeBB->begin());
- MachineInstrBuilder MIB = BuildMI(*MergeBB, MergeBB->instr_begin(), DL,
- TII->get(TargetOpcode::PHI), DestRegister);
- if (IsUndefIfSource && false) {
- MIB.addReg(IfSourceRegister, RegState::Undef);
- } else {
- MIB.addReg(IfSourceRegister);
- }
- MIB.addMBB(IfBB);
- MIB.addReg(CodeSourceRegister);
- MIB.addMBB(CodeBB);
-}
-
-static void removeExternalCFGSuccessors(MachineBasicBlock *MBB) {
- for (MachineBasicBlock::succ_iterator PI = MBB->succ_begin(),
- E = MBB->succ_end();
- PI != E; ++PI) {
- if ((*PI) != MBB) {
- (MBB)->removeSuccessor(*PI);
- }
- }
-}
-
-static void removeExternalCFGEdges(MachineBasicBlock *StartMBB,
- MachineBasicBlock *EndMBB) {
-
- // We have to check against the StartMBB successor because a
- // structurized region with a loop will have the entry block split,
- // and the backedge will go to the entry successor.
- DenseSet<std::pair<MachineBasicBlock *, MachineBasicBlock *>> Succs;
- unsigned SuccSize = StartMBB->succ_size();
- if (SuccSize > 0) {
- MachineBasicBlock *StartMBBSucc = *(StartMBB->succ_begin());
- for (MachineBasicBlock *Succ : EndMBB->successors()) {
- // Either we have a back-edge to the entry block, or a back-edge to the
- // successor of the entry block since the block may be split.
- if (Succ != StartMBB &&
- !(Succ == StartMBBSucc && StartMBB != EndMBB && SuccSize == 1)) {
- Succs.insert(
- std::pair<MachineBasicBlock *, MachineBasicBlock *>(EndMBB, Succ));
- }
- }
- }
-
- for (MachineBasicBlock *Pred : StartMBB->predecessors())
- if (Pred != EndMBB)
- Succs.insert(std::pair(Pred, StartMBB));
-
- for (auto SI : Succs) {
- std::pair<MachineBasicBlock *, MachineBasicBlock *> Edge = SI;
- LLVM_DEBUG(dbgs() << "Removing edge: " << printMBBReference(*Edge.first)
- << " -> " << printMBBReference(*Edge.second) << "\n");
- Edge.first->removeSuccessor(Edge.second);
- }
-}
-
-MachineBasicBlock *AMDGPUMachineCFGStructurizer::createIfBlock(
- MachineBasicBlock *MergeBB, MachineBasicBlock *CodeBBStart,
- MachineBasicBlock *CodeBBEnd, MachineBasicBlock *SelectBB, unsigned IfReg,
- bool InheritPreds) {
- MachineFunction *MF = MergeBB->getParent();
- MachineBasicBlock *IfBB = MF->CreateMachineBasicBlock();
-
- if (InheritPreds) {
- for (MachineBasicBlock *Pred : CodeBBStart->predecessors())
- if (Pred != CodeBBEnd)
- Pred->addSuccessor(IfBB);
- }
-
- removeExternalCFGEdges(CodeBBStart, CodeBBEnd);
-
- auto CodeBBStartI = CodeBBStart->getIterator();
- auto CodeBBEndI = CodeBBEnd->getIterator();
- auto MergeIter = MergeBB->getIterator();
- MF->insert(MergeIter, IfBB);
- MF->splice(MergeIter, CodeBBStartI, ++CodeBBEndI);
- IfBB->addSuccessor(MergeBB);
- IfBB->addSuccessor(CodeBBStart);
-
- LLVM_DEBUG(dbgs() << "Created If block: " << IfBB->getNumber() << "\n");
- // Ensure that the MergeBB is a successor of the CodeEndBB.
- if (!CodeBBEnd->isSuccessor(MergeBB))
- CodeBBEnd->addSuccessor(MergeBB);
-
- LLVM_DEBUG(dbgs() << "Moved " << printMBBReference(*CodeBBStart)
- << " through " << printMBBReference(*CodeBBEnd) << "\n");
-
- // If we have a single predecessor we can find a reasonable debug location
- MachineBasicBlock *SinglePred =
- CodeBBStart->pred_size() == 1 ? *(CodeBBStart->pred_begin()) : nullptr;
- const DebugLoc &DL = SinglePred
- ? SinglePred->findDebugLoc(SinglePred->getFirstTerminator())
- : DebugLoc();
-
- Register Reg =
- TII->insertEQ(IfBB, IfBB->begin(), DL, IfReg,
- SelectBB->getNumber() /* CodeBBStart->getNumber() */);
- if (&(*(IfBB->getParent()->begin())) == IfBB) {
- TII->materializeImmediate(*IfBB, IfBB->begin(), DL, IfReg,
- CodeBBStart->getNumber());
- }
- MachineOperand RegOp = MachineOperand::CreateReg(Reg, false, false, true);
- ArrayRef<MachineOperand> Cond(RegOp);
- TII->insertBranch(*IfBB, MergeBB, CodeBBStart, Cond, DL);
-
- return IfBB;
-}
-
-void AMDGPUMachineCFGStructurizer::ensureCondIsNotKilled(
- SmallVector<MachineOperand, 1> Cond) {
- if (Cond.size() != 1)
- return;
- if (!Cond[0].isReg())
- return;
-
- Register CondReg = Cond[0].getReg();
- for (MachineOperand &MO : MRI->use_operands(CondReg))
- MO.setIsKill(false);
-}
-
-void AMDGPUMachineCFGStructurizer::rewriteCodeBBTerminator(MachineBasicBlock *CodeBB,
- MachineBasicBlock *MergeBB,
- unsigned BBSelectReg) {
- MachineBasicBlock *TrueBB = nullptr;
- MachineBasicBlock *FalseBB = nullptr;
- SmallVector<MachineOperand, 1> Cond;
- MachineBasicBlock *FallthroughBB = FallthroughMap[CodeBB];
- TII->analyzeBranch(*CodeBB, TrueBB, FalseBB, Cond);
-
- const DebugLoc &DL = CodeBB->findDebugLoc(CodeBB->getFirstTerminator());
-
- if (FalseBB == nullptr && TrueBB == nullptr && FallthroughBB == nullptr) {
- // This is an exit block, hence no successors. We will assign the
- // bb select register to the entry block.
- TII->materializeImmediate(*CodeBB, CodeBB->getFirstTerminator(), DL,
- BBSelectReg,
- CodeBB->getParent()->begin()->getNumber());
- insertUnconditionalBranch(CodeBB, MergeBB, DL);
- return;
- }
-
- if (FalseBB == nullptr && TrueBB == nullptr) {
- TrueBB = FallthroughBB;
- } else if (TrueBB != nullptr) {
- FalseBB =
- (FallthroughBB && (FallthroughBB != TrueBB)) ? FallthroughBB : FalseBB;
- }
-
- if ((TrueBB != nullptr && FalseBB == nullptr) || (TrueBB == FalseBB)) {
- TII->materializeImmediate(*CodeBB, CodeBB->getFirstTerminator(), DL,
- BBSelectReg, TrueBB->getNumber());
- } else {
- const TargetRegisterClass *RegClass = MRI->getRegClass(BBSelectReg);
- Register TrueBBReg = MRI->createVirtualRegister(RegClass);
- Register FalseBBReg = MRI->createVirtualRegister(RegClass);
- TII->materializeImmediate(*CodeBB, CodeBB->getFirstTerminator(), DL,
- TrueBBReg, TrueBB->getNumber());
- TII->materializeImmediate(*CodeBB, CodeBB->getFirstTerminator(), DL,
- FalseBBReg, FalseBB->getNumber());
- ensureCondIsNotKilled(Cond);
- TII->insertVectorSelect(*CodeBB, CodeBB->getFirstTerminator(), DL,
- BBSelectReg, Cond, TrueBBReg, FalseBBReg);
- }
-
- insertUnconditionalBranch(CodeBB, MergeBB, DL);
-}
-
-MachineInstr *AMDGPUMachineCFGStructurizer::getDefInstr(unsigned Reg) {
- if (MRI->def_begin(Reg) == MRI->def_end()) {
- LLVM_DEBUG(dbgs() << "Register "
- << printReg(Reg, MRI->getTargetRegisterInfo())
- << " has NO defs\n");
- } else if (!MRI->hasOneDef(Reg)) {
- LLVM_DEBUG(dbgs() << "Register "
- << printReg(Reg, MRI->getTargetRegisterInfo())
- << " has multiple defs\n");
- LLVM_DEBUG(dbgs() << "DEFS BEGIN:\n");
- for (auto DI = MRI->def_begin(Reg), DE = MRI->def_end(); DI != DE; ++DI) {
- LLVM_DEBUG(DI->getParent()->dump());
- }
- LLVM_DEBUG(dbgs() << "DEFS END\n");
- }
-
- assert(MRI->hasOneDef(Reg) && "Register has multiple definitions");
- return (*(MRI->def_begin(Reg))).getParent();
-}
-
-void AMDGPUMachineCFGStructurizer::insertChainedPHI(MachineBasicBlock *IfBB,
- MachineBasicBlock *CodeBB,
- MachineBasicBlock *MergeBB,
- LinearizedRegion *InnerRegion,
- unsigned DestReg,
- unsigned SourceReg) {
- // In this function we know we are part of a chain already, so we need
- // to add the registers to the existing chain, and rename the register
- // inside the region.
- bool IsSingleBB = InnerRegion->getEntry() == InnerRegion->getExit();
- MachineInstr *DefInstr = getDefInstr(SourceReg);
- if (DefInstr->isPHI() && DefInstr->getParent() == CodeBB && IsSingleBB) {
- // Handle the case where the def is a PHI-def inside a basic
- // block, then we only need to do renaming. Special care needs to
- // be taken if the PHI-def is part of an existing chain, or if a
- // new one needs to be created.
- InnerRegion->replaceRegisterInsideRegion(SourceReg, DestReg, true, MRI);
-
- // We collect all PHI Information, and if we are at the region entry,
- // all PHIs will be removed, and then re-introduced if needed.
- storePHILinearizationInfoDest(DestReg, *DefInstr);
- // We have picked up all the information we need now and can remove
- // the PHI
- PHIInfo.removeSource(DestReg, SourceReg, CodeBB);
- DefInstr->eraseFromParent();
- } else {
- // If this is not a phi-def, or it is a phi-def but from a linearized region
- if (IsSingleBB && DefInstr->getParent() == InnerRegion->getEntry()) {
- // If this is a single BB and the definition is in this block we
- // need to replace any uses outside the region.
- InnerRegion->replaceRegisterOutsideRegion(SourceReg, DestReg, false, MRI);
- }
- const TargetRegisterClass *RegClass = MRI->getRegClass(DestReg);
- Register NextDestReg = MRI->createVirtualRegister(RegClass);
- bool IsLastDef = PHIInfo.getNumSources(DestReg) == 1;
- LLVM_DEBUG(dbgs() << "Insert Chained PHI\n");
- insertMergePHI(IfBB, InnerRegion->getExit(), MergeBB, DestReg, NextDestReg,
- SourceReg, IsLastDef);
-
- PHIInfo.removeSource(DestReg, SourceReg, CodeBB);
- if (IsLastDef) {
- const DebugLoc &DL = IfBB->findDebugLoc(IfBB->getFirstTerminator());
- TII->materializeImmediate(*IfBB, IfBB->getFirstTerminator(), DL,
- NextDestReg, 0);
- PHIInfo.deleteDef(DestReg);
- } else {
- PHIInfo.replaceDef(DestReg, NextDestReg);
- }
- }
-}
-
-bool AMDGPUMachineCFGStructurizer::containsDef(MachineBasicBlock *MBB,
- LinearizedRegion *InnerRegion,
- unsigned Register) {
- return getDefInstr(Register)->getParent() == MBB ||
- InnerRegion->contains(getDefInstr(Register)->getParent());
-}
-
-void AMDGPUMachineCFGStructurizer::rewriteLiveOutRegs(MachineBasicBlock *IfBB,
- MachineBasicBlock *CodeBB,
- MachineBasicBlock *MergeBB,
- LinearizedRegion *InnerRegion,
- LinearizedRegion *LRegion) {
- DenseSet<unsigned> *LiveOuts = InnerRegion->getLiveOuts();
- SmallVector<unsigned, 4> OldLiveOuts;
- bool IsSingleBB = InnerRegion->getEntry() == InnerRegion->getExit();
- for (auto OLI : *LiveOuts) {
- OldLiveOuts.push_back(OLI);
- }
-
- for (auto LI : OldLiveOuts) {
- LLVM_DEBUG(dbgs() << "LiveOut: " << printReg(LI, TRI));
- if (!containsDef(CodeBB, InnerRegion, LI) ||
- (!IsSingleBB && (getDefInstr(LI)->getParent() == LRegion->getExit()))) {
- // If the register simply lives through the CodeBB, we don't have
- // to rewrite anything since the register is not defined in this
- // part of the code.
- LLVM_DEBUG(dbgs() << "- through");
- continue;
- }
- LLVM_DEBUG(dbgs() << "\n");
- unsigned Reg = LI;
- if (/*!PHIInfo.isSource(Reg) &&*/ Reg != InnerRegion->getBBSelectRegOut()) {
- // If the register is live out, we do want to create a phi,
- // unless it is from the Exit block, because in that case there
- // is already a PHI, and no need to create a new one.
-
- // If the register is just a live out def and not part of a phi
- // chain, we need to create a PHI node to handle the if region,
- // and replace all uses outside of the region with the new dest
- // register, unless it is the outgoing BB select register. We have
- // already created phi nodes for these.
- const TargetRegisterClass *RegClass = MRI->getRegClass(Reg);
- Register PHIDestReg = MRI->createVirtualRegister(RegClass);
- Register IfSourceReg = MRI->createVirtualRegister(RegClass);
- // Create initializer, this value is never used, but is needed
- // to satisfy SSA.
- LLVM_DEBUG(dbgs() << "Initializer for reg: " << printReg(Reg) << "\n");
- TII->materializeImmediate(*IfBB, IfBB->getFirstTerminator(), DebugLoc(),
- IfSourceReg, 0);
-
- InnerRegion->replaceRegisterOutsideRegion(Reg, PHIDestReg, true, MRI);
- LLVM_DEBUG(dbgs() << "Insert Non-Chained Live out PHI\n");
- insertMergePHI(IfBB, InnerRegion->getExit(), MergeBB, PHIDestReg,
- IfSourceReg, Reg, true);
- }
- }
-
- // Handle the chained definitions in PHIInfo, checking if this basic block
- // is a source block for a definition.
- SmallVector<unsigned, 4> Sources;
- if (PHIInfo.findSourcesFromMBB(CodeBB, Sources)) {
- LLVM_DEBUG(dbgs() << "Inserting PHI Live Out from "
- << printMBBReference(*CodeBB) << "\n");
- for (auto SI : Sources) {
- unsigned DestReg;
- PHIInfo.findDest(SI, CodeBB, DestReg);
- insertChainedPHI(IfBB, CodeBB, MergeBB, InnerRegion, DestReg, SI);
- }
- LLVM_DEBUG(dbgs() << "Insertion done.\n");
- }
-
- LLVM_DEBUG(PHIInfo.dump(MRI));
-}
-
-void AMDGPUMachineCFGStructurizer::prunePHIInfo(MachineBasicBlock *MBB) {
- LLVM_DEBUG(dbgs() << "Before PHI Prune\n");
- LLVM_DEBUG(PHIInfo.dump(MRI));
- SmallVector<std::tuple<unsigned, unsigned, MachineBasicBlock *>, 4>
- ElimiatedSources;
- for (auto DRI = PHIInfo.dests_begin(), DE = PHIInfo.dests_end(); DRI != DE;
- ++DRI) {
-
- unsigned DestReg = *DRI;
- auto SE = PHIInfo.sources_end(DestReg);
-
- bool MBBContainsPHISource = false;
- // Check if there is a PHI source in this MBB
- for (auto SRI = PHIInfo.sources_begin(DestReg); SRI != SE; ++SRI) {
- unsigned SourceReg = (*SRI).first;
- MachineOperand *Def = &(*(MRI->def_begin(SourceReg)));
- if (Def->getParent()->getParent() == MBB) {
- MBBContainsPHISource = true;
- }
- }
-
- // If so, all other sources are useless since we know this block
- // is always executed when the region is executed.
- if (MBBContainsPHISource) {
- for (auto SRI = PHIInfo.sources_begin(DestReg); SRI != SE; ++SRI) {
- PHILinearize::PHISourceT Source = *SRI;
- unsigned SourceReg = Source.first;
- MachineBasicBlock *SourceMBB = Source.second;
- MachineOperand *Def = &(*(MRI->def_begin(SourceReg)));
- if (Def->getParent()->getParent() != MBB) {
- ElimiatedSources.push_back(std::tuple(DestReg, SourceReg, SourceMBB));
- }
- }
- }
- }
-
- // Remove the PHI sources that are in the given MBB
- for (auto &SourceInfo : ElimiatedSources) {
- PHIInfo.removeSource(std::get<0>(SourceInfo), std::get<1>(SourceInfo),
- std::get<2>(SourceInfo));
- }
- LLVM_DEBUG(dbgs() << "After PHI Prune\n");
- LLVM_DEBUG(PHIInfo.dump(MRI));
-}
-
-void AMDGPUMachineCFGStructurizer::createEntryPHI(LinearizedRegion *CurrentRegion,
- unsigned DestReg) {
- MachineBasicBlock *Entry = CurrentRegion->getEntry();
- MachineBasicBlock *Exit = CurrentRegion->getExit();
-
- LLVM_DEBUG(dbgs() << "RegionExit: " << Exit->getNumber() << " Pred: "
- << (*(Entry->pred_begin()))->getNumber() << "\n");
-
- int NumSources = 0;
- auto SE = PHIInfo.sources_end(DestReg);
-
- for (auto SRI = PHIInfo.sources_begin(DestReg); SRI != SE; ++SRI) {
- NumSources++;
- }
-
- if (NumSources == 1) {
- auto SRI = PHIInfo.sources_begin(DestReg);
- unsigned SourceReg = (*SRI).first;
- replaceRegisterWith(DestReg, SourceReg);
- } else {
- const DebugLoc &DL = Entry->findDebugLoc(Entry->begin());
- MachineInstrBuilder MIB = BuildMI(*Entry, Entry->instr_begin(), DL,
- TII->get(TargetOpcode::PHI), DestReg);
- LLVM_DEBUG(dbgs() << "Entry PHI " << printReg(DestReg, TRI) << " = PHI(");
-
- unsigned CurrentBackedgeReg = 0;
-
- for (auto SRI = PHIInfo.sources_begin(DestReg); SRI != SE; ++SRI) {
- unsigned SourceReg = (*SRI).first;
-
- if (CurrentRegion->contains((*SRI).second)) {
- if (CurrentBackedgeReg == 0) {
- CurrentBackedgeReg = SourceReg;
- } else {
- MachineInstr *PHIDefInstr = getDefInstr(SourceReg);
- MachineBasicBlock *PHIDefMBB = PHIDefInstr->getParent();
- const TargetRegisterClass *RegClass =
- MRI->getRegClass(CurrentBackedgeReg);
- Register NewBackedgeReg = MRI->createVirtualRegister(RegClass);
- MachineInstrBuilder BackedgePHI =
- BuildMI(*PHIDefMBB, PHIDefMBB->instr_begin(), DL,
- TII->get(TargetOpcode::PHI), NewBackedgeReg);
- BackedgePHI.addReg(CurrentBackedgeReg);
- BackedgePHI.addMBB(getPHIPred(*PHIDefInstr, 0));
- BackedgePHI.addReg(getPHISourceReg(*PHIDefInstr, 1));
- BackedgePHI.addMBB((*SRI).second);
- CurrentBackedgeReg = NewBackedgeReg;
- LLVM_DEBUG(dbgs()
- << "Inserting backedge PHI: "
- << printReg(NewBackedgeReg, TRI) << " = PHI("
- << printReg(CurrentBackedgeReg, TRI) << ", "
- << printMBBReference(*getPHIPred(*PHIDefInstr, 0)) << ", "
- << printReg(getPHISourceReg(*PHIDefInstr, 1), TRI) << ", "
- << printMBBReference(*(*SRI).second));
- }
- } else {
- MIB.addReg(SourceReg);
- MIB.addMBB((*SRI).second);
- LLVM_DEBUG(dbgs() << printReg(SourceReg, TRI) << ", "
- << printMBBReference(*(*SRI).second) << ", ");
- }
- }
-
- // Add the final backedge register source to the entry phi
- if (CurrentBackedgeReg != 0) {
- MIB.addReg(CurrentBackedgeReg);
- MIB.addMBB(Exit);
- LLVM_DEBUG(dbgs() << printReg(CurrentBackedgeReg, TRI) << ", "
- << printMBBReference(*Exit) << ")\n");
- } else {
- LLVM_DEBUG(dbgs() << ")\n");
- }
- }
-}
-
-void AMDGPUMachineCFGStructurizer::createEntryPHIs(LinearizedRegion *CurrentRegion) {
- LLVM_DEBUG(PHIInfo.dump(MRI));
-
- for (auto DRI = PHIInfo.dests_begin(), DE = PHIInfo.dests_end(); DRI != DE;
- ++DRI) {
-
- unsigned DestReg = *DRI;
- createEntryPHI(CurrentRegion, DestReg);
- }
- PHIInfo.clear();
-}
-
-void AMDGPUMachineCFGStructurizer::replaceRegisterWith(
- unsigned Register, class Register NewRegister) {
- assert(Register != NewRegister && "Cannot replace a reg with itself");
-
- for (MachineRegisterInfo::reg_iterator I = MRI->reg_begin(Register),
- E = MRI->reg_end();
- I != E;) {
- MachineOperand &O = *I;
- ++I;
- if (NewRegister.isPhysical()) {
- LLVM_DEBUG(dbgs() << "Trying to substitute physical register: "
- << printReg(NewRegister, MRI->getTargetRegisterInfo())
- << "\n");
- llvm_unreachable("Cannot substitute physical registers");
- // We don't handle physical registers, but if we need to
- // in the future This is how we do it:
- // O.substPhysReg(NewRegister, *TRI);
- } else {
- LLVM_DEBUG(dbgs() << "Replacing register: "
- << printReg(Register, MRI->getTargetRegisterInfo())
- << " with "
- << printReg(NewRegister, MRI->getTargetRegisterInfo())
- << "\n");
- O.setReg(NewRegister);
- }
- }
- PHIInfo.deleteDef(Register);
-
- getRegionMRT()->replaceLiveOutReg(Register, NewRegister);
-
- LLVM_DEBUG(PHIInfo.dump(MRI));
-}
-
-void AMDGPUMachineCFGStructurizer::resolvePHIInfos(MachineBasicBlock *FunctionEntry) {
- LLVM_DEBUG(dbgs() << "Resolve PHI Infos\n");
- LLVM_DEBUG(PHIInfo.dump(MRI));
- for (auto DRI = PHIInfo.dests_begin(), DE = PHIInfo.dests_end(); DRI != DE;
- ++DRI) {
- unsigned DestReg = *DRI;
- LLVM_DEBUG(dbgs() << "DestReg: " << printReg(DestReg, TRI) << "\n");
- auto SRI = PHIInfo.sources_begin(DestReg);
- unsigned SourceReg = (*SRI).first;
- LLVM_DEBUG(dbgs() << "DestReg: " << printReg(DestReg, TRI)
- << " SourceReg: " << printReg(SourceReg, TRI) << "\n");
-
- assert(PHIInfo.sources_end(DestReg) == ++SRI &&
- "More than one phi source in entry node");
- replaceRegisterWith(DestReg, SourceReg);
- }
-}
-
-static bool isFunctionEntryBlock(MachineBasicBlock *MBB) {
- return ((&(*(MBB->getParent()->begin()))) == MBB);
-}
-
-MachineBasicBlock *AMDGPUMachineCFGStructurizer::createIfRegion(
- MachineBasicBlock *MergeBB, MachineBasicBlock *CodeBB,
- LinearizedRegion *CurrentRegion, unsigned BBSelectRegIn,
- unsigned BBSelectRegOut) {
- if (isFunctionEntryBlock(CodeBB) && !CurrentRegion->getHasLoop()) {
- // Handle non-loop function entry block.
- // We need to allow loops to the entry block and then
- rewriteCodeBBTerminator(CodeBB, MergeBB, BBSelectRegOut);
- resolvePHIInfos(CodeBB);
- removeExternalCFGSuccessors(CodeBB);
- CodeBB->addSuccessor(MergeBB);
- CurrentRegion->addMBB(CodeBB);
- return nullptr;
- }
- if (CurrentRegion->getEntry() == CodeBB && !CurrentRegion->getHasLoop()) {
- // Handle non-loop region entry block.
- MachineFunction *MF = MergeBB->getParent();
- auto MergeIter = MergeBB->getIterator();
- auto CodeBBStartIter = CodeBB->getIterator();
- auto CodeBBEndIter = ++(CodeBB->getIterator());
- if (CodeBBEndIter != MergeIter) {
- MF->splice(MergeIter, CodeBBStartIter, CodeBBEndIter);
- }
- rewriteCodeBBTerminator(CodeBB, MergeBB, BBSelectRegOut);
- prunePHIInfo(CodeBB);
- createEntryPHIs(CurrentRegion);
- removeExternalCFGSuccessors(CodeBB);
- CodeBB->addSuccessor(MergeBB);
- CurrentRegion->addMBB(CodeBB);
- return nullptr;
- }
- // Handle internal block.
- const TargetRegisterClass *RegClass = MRI->getRegClass(BBSelectRegIn);
- Register CodeBBSelectReg = MRI->createVirtualRegister(RegClass);
- rewriteCodeBBTerminator(CodeBB, MergeBB, CodeBBSelectReg);
- bool IsRegionEntryBB = CurrentRegion->getEntry() == CodeBB;
- MachineBasicBlock *IfBB = createIfBlock(MergeBB, CodeBB, CodeBB, CodeBB,
- BBSelectRegIn, IsRegionEntryBB);
- CurrentRegion->addMBB(IfBB);
- // If this is the entry block we need to make the If block the new
- // linearized region entry.
- if (IsRegionEntryBB) {
- CurrentRegion->setEntry(IfBB);
-
- if (CurrentRegion->getHasLoop()) {
- MachineBasicBlock *RegionExit = CurrentRegion->getExit();
- MachineBasicBlock *ETrueBB = nullptr;
- MachineBasicBlock *EFalseBB = nullptr;
- SmallVector<MachineOperand, 1> ECond;
-
- const DebugLoc &DL = DebugLoc();
- TII->analyzeBranch(*RegionExit, ETrueBB, EFalseBB, ECond);
- TII->removeBranch(*RegionExit);
-
- // We need to create a backedge if there is a loop
- Register Reg =
- TII->insertNE(RegionExit, RegionExit->instr_end(), DL,
- CurrentRegion->getRegionMRT()->getInnerOutputRegister(),
- CurrentRegion->getRegionMRT()->getEntry()->getNumber());
- MachineOperand RegOp = MachineOperand::CreateReg(Reg, false, false, true);
- ArrayRef<MachineOperand> Cond(RegOp);
- LLVM_DEBUG(dbgs() << "RegionExitReg: ");
- LLVM_DEBUG(RegOp.print(dbgs(), TRI));
- LLVM_DEBUG(dbgs() << "\n");
- TII->insertBranch(*RegionExit, CurrentRegion->getEntry(), RegionExit,
- Cond, DebugLoc());
- RegionExit->addSuccessor(CurrentRegion->getEntry());
- }
- }
- CurrentRegion->addMBB(CodeBB);
- LinearizedRegion InnerRegion(CodeBB, MRI, TRI, PHIInfo);
-
- InnerRegion.setParent(CurrentRegion);
- LLVM_DEBUG(dbgs() << "Insert BB Select PHI (BB)\n");
- insertMergePHI(IfBB, CodeBB, MergeBB, BBSelectRegOut, BBSelectRegIn,
- CodeBBSelectReg);
- InnerRegion.addMBB(MergeBB);
-
- LLVM_DEBUG(InnerRegion.print(dbgs(), TRI));
- rewriteLiveOutRegs(IfBB, CodeBB, MergeBB, &InnerRegion, CurrentRegion);
- extractKilledPHIs(CodeBB);
- if (IsRegionEntryBB)
- createEntryPHIs(CurrentRegion);
- return IfBB;
-}
-
-MachineBasicBlock *AMDGPUMachineCFGStructurizer::createIfRegion(
- MachineBasicBlock *MergeBB, LinearizedRegion *InnerRegion,
- LinearizedRegion *CurrentRegion, MachineBasicBlock *SelectBB,
- unsigned BBSelectRegIn, unsigned BBSelectRegOut) {
- unsigned CodeBBSelectReg =
- InnerRegion->getRegionMRT()->getInnerOutputRegister();
- MachineBasicBlock *CodeEntryBB = InnerRegion->getEntry();
- MachineBasicBlock *CodeExitBB = InnerRegion->getExit();
- MachineBasicBlock *IfBB = createIfBlock(MergeBB, CodeEntryBB, CodeExitBB,
- SelectBB, BBSelectRegIn, true);
- CurrentRegion->addMBB(IfBB);
- bool isEntry = CurrentRegion->getEntry() == InnerRegion->getEntry();
- if (isEntry) {
-
- if (CurrentRegion->getHasLoop()) {
- MachineBasicBlock *RegionExit = CurrentRegion->getExit();
- MachineBasicBlock *ETrueBB = nullptr;
- MachineBasicBlock *EFalseBB = nullptr;
- SmallVector<MachineOperand, 1> ECond;
-
- const DebugLoc &DL = DebugLoc();
- TII->analyzeBranch(*RegionExit, ETrueBB, EFalseBB, ECond);
- TII->removeBranch(*RegionExit);
-
- // We need to create a backedge if there is a loop
- Register Reg =
- TII->insertNE(RegionExit, RegionExit->instr_end(), DL,
- CurrentRegion->getRegionMRT()->getInnerOutputRegister(),
- CurrentRegion->getRegionMRT()->getEntry()->getNumber());
- MachineOperand RegOp = MachineOperand::CreateReg(Reg, false, false, true);
- ArrayRef<MachineOperand> Cond(RegOp);
- LLVM_DEBUG(dbgs() << "RegionExitReg: ");
- LLVM_DEBUG(Cond[0].print(dbgs(), TRI));
- LLVM_DEBUG(dbgs() << "\n");
- TII->insertBranch(*RegionExit, CurrentRegion->getEntry(), RegionExit,
- Cond, DebugLoc());
- RegionExit->addSuccessor(IfBB);
- }
- }
- CurrentRegion->addMBBs(InnerRegion);
- LLVM_DEBUG(dbgs() << "Insert BB Select PHI (region)\n");
- insertMergePHI(IfBB, CodeExitBB, MergeBB, BBSelectRegOut, BBSelectRegIn,
- CodeBBSelectReg);
-
- rewriteLiveOutRegs(IfBB, /* CodeEntryBB */ CodeExitBB, MergeBB, InnerRegion,
- CurrentRegion);
-
- rewriteRegionEntryPHIs(InnerRegion, IfBB);
-
- if (isEntry) {
- CurrentRegion->setEntry(IfBB);
- }
-
- if (isEntry) {
- createEntryPHIs(CurrentRegion);
- }
-
- return IfBB;
-}
-
-void AMDGPUMachineCFGStructurizer::splitLoopPHI(MachineInstr &PHI,
- MachineBasicBlock *Entry,
- MachineBasicBlock *EntrySucc,
- LinearizedRegion *LRegion) {
- SmallVector<unsigned, 2> PHIRegionIndices;
- getPHIRegionIndices(LRegion, PHI, PHIRegionIndices);
-
- assert(PHIRegionIndices.size() == 1);
-
- unsigned RegionIndex = PHIRegionIndices[0];
- unsigned RegionSourceReg = getPHISourceReg(PHI, RegionIndex);
- MachineBasicBlock *RegionSourceMBB = getPHIPred(PHI, RegionIndex);
- unsigned PHIDest = getPHIDestReg(PHI);
- unsigned PHISource = PHIDest;
- unsigned ReplaceReg;
-
- if (shrinkPHI(PHI, PHIRegionIndices, &ReplaceReg)) {
- PHISource = ReplaceReg;
- }
-
- const TargetRegisterClass *RegClass = MRI->getRegClass(PHIDest);
- Register NewDestReg = MRI->createVirtualRegister(RegClass);
- LRegion->replaceRegisterInsideRegion(PHIDest, NewDestReg, false, MRI);
- MachineInstrBuilder MIB =
- BuildMI(*EntrySucc, EntrySucc->instr_begin(), PHI.getDebugLoc(),
- TII->get(TargetOpcode::PHI), NewDestReg);
- LLVM_DEBUG(dbgs() << "Split Entry PHI " << printReg(NewDestReg, TRI)
- << " = PHI(");
- MIB.addReg(PHISource);
- MIB.addMBB(Entry);
- LLVM_DEBUG(dbgs() << printReg(PHISource, TRI) << ", "
- << printMBBReference(*Entry));
- MIB.addReg(RegionSourceReg);
- MIB.addMBB(RegionSourceMBB);
- LLVM_DEBUG(dbgs() << " ," << printReg(RegionSourceReg, TRI) << ", "
- << printMBBReference(*RegionSourceMBB) << ")\n");
-}
-
-void AMDGPUMachineCFGStructurizer::splitLoopPHIs(MachineBasicBlock *Entry,
- MachineBasicBlock *EntrySucc,
- LinearizedRegion *LRegion) {
- SmallVector<MachineInstr *, 2> PHIs;
- collectPHIs(Entry, PHIs);
-
- for (auto *PHII : PHIs) {
- splitLoopPHI(*PHII, Entry, EntrySucc, LRegion);
- }
-}
-
-// Split the exit block so that we can insert a end control flow
-MachineBasicBlock *
-AMDGPUMachineCFGStructurizer::splitExit(LinearizedRegion *LRegion) {
- auto MRTRegion = LRegion->getRegionMRT();
- auto Exit = LRegion->getExit();
- auto MF = Exit->getParent();
- auto Succ = MRTRegion->getSucc();
-
- auto NewExit = MF->CreateMachineBasicBlock();
- auto AfterExitIter = Exit->getIterator();
- AfterExitIter++;
- MF->insert(AfterExitIter, NewExit);
- Exit->removeSuccessor(Succ);
- Exit->addSuccessor(NewExit);
- NewExit->addSuccessor(Succ);
- insertUnconditionalBranch(NewExit, Succ);
- LRegion->addMBB(NewExit);
- LRegion->setExit(NewExit);
-
- LLVM_DEBUG(dbgs() << "Created new exit block: " << NewExit->getNumber()
- << "\n");
-
- // Replace any PHI Predecessors in the successor with NewExit
- for (auto &II : *Succ) {
- MachineInstr &Instr = II;
-
- // If we are past the PHI instructions we are done
- if (!Instr.isPHI())
- break;
-
- int numPreds = getPHINumInputs(Instr);
- for (int i = 0; i < numPreds; ++i) {
- auto Pred = getPHIPred(Instr, i);
- if (Pred == Exit) {
- setPhiPred(Instr, i, NewExit);
- }
- }
- }
-
- return NewExit;
-}
-
-static MachineBasicBlock *split(MachineBasicBlock::iterator I) {
- // Create the fall-through block.
- MachineBasicBlock *MBB = (*I).getParent();
- MachineFunction *MF = MBB->getParent();
- MachineBasicBlock *SuccMBB = MF->CreateMachineBasicBlock();
- auto MBBIter = ++(MBB->getIterator());
- MF->insert(MBBIter, SuccMBB);
- SuccMBB->transferSuccessorsAndUpdatePHIs(MBB);
- MBB->addSuccessor(SuccMBB);
-
- // Splice the code over.
- SuccMBB->splice(SuccMBB->end(), MBB, I, MBB->end());
-
- return SuccMBB;
-}
-
-// Split the entry block separating PHI-nodes and the rest of the code
-// This is needed to insert an initializer for the bb select register
-// inloop regions.
-
-MachineBasicBlock *
-AMDGPUMachineCFGStructurizer::splitEntry(LinearizedRegion *LRegion) {
- MachineBasicBlock *Entry = LRegion->getEntry();
- MachineBasicBlock *EntrySucc = split(Entry->getFirstNonPHI());
- MachineBasicBlock *Exit = LRegion->getExit();
-
- LLVM_DEBUG(dbgs() << "Split " << printMBBReference(*Entry) << " to "
- << printMBBReference(*Entry) << " -> "
- << printMBBReference(*EntrySucc) << "\n");
- LRegion->addMBB(EntrySucc);
-
- // Make the backedge go to Entry Succ
- if (Exit->isSuccessor(Entry)) {
- Exit->removeSuccessor(Entry);
- }
- Exit->addSuccessor(EntrySucc);
- MachineInstr &Branch = *(Exit->instr_rbegin());
- for (auto &UI : Branch.uses()) {
- if (UI.isMBB() && UI.getMBB() == Entry) {
- UI.setMBB(EntrySucc);
- }
- }
-
- splitLoopPHIs(Entry, EntrySucc, LRegion);
-
- return EntrySucc;
-}
-
-LinearizedRegion *
-AMDGPUMachineCFGStructurizer::initLinearizedRegion(RegionMRT *Region) {
- LinearizedRegion *LRegion = Region->getLinearizedRegion();
- LRegion->initLiveOut(Region, MRI, TRI, PHIInfo);
- LRegion->setEntry(Region->getEntry());
- return LRegion;
-}
-
-static void removeOldExitPreds(RegionMRT *Region) {
- MachineBasicBlock *Exit = Region->getSucc();
- if (Exit == nullptr) {
- return;
- }
- for (MachineBasicBlock::pred_iterator PI = Exit->pred_begin(),
- E = Exit->pred_end();
- PI != E; ++PI) {
- if (Region->contains(*PI)) {
- (*PI)->removeSuccessor(Exit);
- }
- }
-}
-
-static bool mbbHasBackEdge(MachineBasicBlock *MBB,
- SmallPtrSet<MachineBasicBlock *, 8> &MBBs) {
- for (MachineBasicBlock *Succ : MBB->successors())
- if (MBBs.contains(Succ))
- return true;
- return false;
-}
-
-static bool containsNewBackedge(MRT *Tree,
- SmallPtrSet<MachineBasicBlock *, 8> &MBBs) {
- // Need to traverse this in reverse since it is in post order.
- if (Tree == nullptr)
- return false;
-
- if (Tree->isMBB()) {
- MachineBasicBlock *MBB = Tree->getMBBMRT()->getMBB();
- MBBs.insert(MBB);
- if (mbbHasBackEdge(MBB, MBBs)) {
- return true;
- }
- } else {
- RegionMRT *Region = Tree->getRegionMRT();
- for (MRT *C : llvm::reverse(*Region->getChildren()))
- if (containsNewBackedge(C, MBBs))
- return true;
- }
- return false;
-}
-
-static bool containsNewBackedge(RegionMRT *Region) {
- SmallPtrSet<MachineBasicBlock *, 8> MBBs;
- return containsNewBackedge(Region, MBBs);
-}
-
-bool AMDGPUMachineCFGStructurizer::structurizeComplexRegion(RegionMRT *Region) {
- auto *LRegion = initLinearizedRegion(Region);
- LRegion->setHasLoop(containsNewBackedge(Region));
- MachineBasicBlock *LastMerge = createLinearizedExitBlock(Region);
- MachineBasicBlock *CurrentMerge = LastMerge;
- LRegion->addMBB(LastMerge);
- LRegion->setExit(LastMerge);
-
- rewriteRegionExitPHIs(Region, LastMerge, LRegion);
- removeOldExitPreds(Region);
-
- LLVM_DEBUG(PHIInfo.dump(MRI));
-
- SetVector<MRT *> *Children = Region->getChildren();
- LLVM_DEBUG(dbgs() << "===========If Region Start===============\n");
- if (LRegion->getHasLoop()) {
- LLVM_DEBUG(dbgs() << "Has Backedge: Yes\n");
- } else {
- LLVM_DEBUG(dbgs() << "Has Backedge: No\n");
- }
-
- unsigned BBSelectRegIn;
- unsigned BBSelectRegOut;
- for (MRT *Child : *Children) {
- LLVM_DEBUG(dbgs() << "CurrentRegion: \n");
- LLVM_DEBUG(LRegion->print(dbgs(), TRI));
-
- if (Child->isRegion()) {
-
- LinearizedRegion *InnerLRegion =
- Child->getRegionMRT()->getLinearizedRegion();
- // We found the block is the exit of an inner region, we need
- // to put it in the current linearized region.
-
- LLVM_DEBUG(dbgs() << "Linearizing region: ");
- LLVM_DEBUG(InnerLRegion->print(dbgs(), TRI));
- LLVM_DEBUG(dbgs() << "\n");
-
- MachineBasicBlock *InnerEntry = InnerLRegion->getEntry();
- if ((&(*(InnerEntry->getParent()->begin()))) == InnerEntry) {
- // Entry has already been linearized, no need to do this region.
- unsigned OuterSelect = InnerLRegion->getBBSelectRegOut();
- unsigned InnerSelectReg =
- InnerLRegion->getRegionMRT()->getInnerOutputRegister();
- replaceRegisterWith(InnerSelectReg, OuterSelect),
- resolvePHIInfos(InnerEntry);
- if (!InnerLRegion->getExit()->isSuccessor(CurrentMerge))
- InnerLRegion->getExit()->addSuccessor(CurrentMerge);
- continue;
- }
-
- BBSelectRegOut = Child->getBBSelectRegOut();
- BBSelectRegIn = Child->getBBSelectRegIn();
-
- LLVM_DEBUG(dbgs() << "BBSelectRegIn: " << printReg(BBSelectRegIn, TRI)
- << "\n");
- LLVM_DEBUG(dbgs() << "BBSelectRegOut: " << printReg(BBSelectRegOut, TRI)
- << "\n");
-
- MachineBasicBlock *IfEnd = CurrentMerge;
- CurrentMerge = createIfRegion(CurrentMerge, InnerLRegion, LRegion,
- Child->getRegionMRT()->getEntry(),
- BBSelectRegIn, BBSelectRegOut);
- TII->convertNonUniformIfRegion(CurrentMerge, IfEnd);
- } else {
- MachineBasicBlock *MBB = Child->getMBBMRT()->getMBB();
- LLVM_DEBUG(dbgs() << "Linearizing block: " << MBB->getNumber() << "\n");
-
- if (MBB == getSingleExitNode(*(MBB->getParent()))) {
- // If this is the exit block then we need to skip to the next.
- // The "in" register will be transferred to "out" in the next
- // iteration.
- continue;
- }
-
- BBSelectRegOut = Child->getBBSelectRegOut();
- BBSelectRegIn = Child->getBBSelectRegIn();
-
- LLVM_DEBUG(dbgs() << "BBSelectRegIn: " << printReg(BBSelectRegIn, TRI)
- << "\n");
- LLVM_DEBUG(dbgs() << "BBSelectRegOut: " << printReg(BBSelectRegOut, TRI)
- << "\n");
-
- MachineBasicBlock *IfEnd = CurrentMerge;
- // This is a basic block that is not part of an inner region, we
- // need to put it in the current linearized region.
- CurrentMerge = createIfRegion(CurrentMerge, MBB, LRegion, BBSelectRegIn,
- BBSelectRegOut);
- if (CurrentMerge) {
- TII->convertNonUniformIfRegion(CurrentMerge, IfEnd);
- }
-
- LLVM_DEBUG(PHIInfo.dump(MRI));
- }
- }
-
- LRegion->removeFalseRegisterKills(MRI);
-
- if (LRegion->getHasLoop()) {
- MachineBasicBlock *NewSucc = splitEntry(LRegion);
- if (isFunctionEntryBlock(LRegion->getEntry())) {
- resolvePHIInfos(LRegion->getEntry());
- }
- const DebugLoc &DL = NewSucc->findDebugLoc(NewSucc->getFirstNonPHI());
- unsigned InReg = LRegion->getBBSelectRegIn();
- Register InnerSelectReg =
- MRI->createVirtualRegister(MRI->getRegClass(InReg));
- Register NewInReg = MRI->createVirtualRegister(MRI->getRegClass(InReg));
- TII->materializeImmediate(*(LRegion->getEntry()),
- LRegion->getEntry()->getFirstTerminator(), DL,
- NewInReg, Region->getEntry()->getNumber());
- // Need to be careful about updating the registers inside the region.
- LRegion->replaceRegisterInsideRegion(InReg, InnerSelectReg, false, MRI);
- LLVM_DEBUG(dbgs() << "Loop BBSelect Merge PHI:\n");
- insertMergePHI(LRegion->getEntry(), LRegion->getExit(), NewSucc,
- InnerSelectReg, NewInReg,
- LRegion->getRegionMRT()->getInnerOutputRegister());
- splitExit(LRegion);
- TII->convertNonUniformLoopRegion(NewSucc, LastMerge);
- }
-
- if (Region->isRoot()) {
- TII->insertReturn(*LastMerge);
- }
-
- LLVM_DEBUG(Region->getEntry()->getParent()->dump());
- LLVM_DEBUG(LRegion->print(dbgs(), TRI));
- LLVM_DEBUG(PHIInfo.dump(MRI));
-
- LLVM_DEBUG(dbgs() << "===========If Region End===============\n");
-
- Region->setLinearizedRegion(LRegion);
- return true;
-}
-
-bool AMDGPUMachineCFGStructurizer::structurizeRegion(RegionMRT *Region) {
- if (false && regionIsSimpleIf(Region)) {
- transformSimpleIfRegion(Region);
- return true;
- }
- if (regionIsSequence(Region))
- fixupRegionExits(Region);
- else
- structurizeComplexRegion(Region);
- return false;
-}
-
-static int structurize_once = 0;
-
-bool AMDGPUMachineCFGStructurizer::structurizeRegions(RegionMRT *Region,
- bool isTopRegion) {
- bool Changed = false;
-
- auto Children = Region->getChildren();
- for (auto *CI : *Children) {
- if (CI->isRegion()) {
- Changed |= structurizeRegions(CI->getRegionMRT(), false);
- }
- }
-
- if (structurize_once < 2 || true) {
- Changed |= structurizeRegion(Region);
- structurize_once++;
- }
- return Changed;
-}
-
-void AMDGPUMachineCFGStructurizer::initFallthroughMap(MachineFunction &MF) {
- LLVM_DEBUG(dbgs() << "Fallthrough Map:\n");
- for (auto &MBBI : MF) {
- MachineBasicBlock *MBB = MBBI.getFallThrough();
- if (MBB != nullptr) {
- LLVM_DEBUG(dbgs() << "Fallthrough: " << MBBI.getNumber() << " -> "
- << MBB->getNumber() << "\n");
- }
- FallthroughMap[&MBBI] = MBB;
- }
-}
-
-void AMDGPUMachineCFGStructurizer::createLinearizedRegion(RegionMRT *Region,
- unsigned SelectOut) {
- LinearizedRegion *LRegion = new LinearizedRegion();
- if (SelectOut) {
- LRegion->addLiveOut(SelectOut);
- LLVM_DEBUG(dbgs() << "Add LiveOut (BBSelect): " << printReg(SelectOut, TRI)
- << "\n");
- }
- LRegion->setRegionMRT(Region);
- Region->setLinearizedRegion(LRegion);
- LRegion->setParent(Region->getParent()
- ? Region->getParent()->getLinearizedRegion()
- : nullptr);
-}
-
-unsigned
-AMDGPUMachineCFGStructurizer::initializeSelectRegisters(MRT *MRT, unsigned SelectOut,
- MachineRegisterInfo *MRI,
- const SIInstrInfo *TII) {
- if (MRT->isRegion()) {
- RegionMRT *Region = MRT->getRegionMRT();
- Region->setBBSelectRegOut(SelectOut);
- unsigned InnerSelectOut = createBBSelectReg(TII, MRI);
-
- // Fixme: Move linearization creation to the original spot
- createLinearizedRegion(Region, SelectOut);
-
- for (auto *CI : *Region->getChildren())
- InnerSelectOut = initializeSelectRegisters(CI, InnerSelectOut, MRI, TII);
- MRT->setBBSelectRegIn(InnerSelectOut);
- return InnerSelectOut;
- }
- MRT->setBBSelectRegOut(SelectOut);
- unsigned NewSelectIn = createBBSelectReg(TII, MRI);
- MRT->setBBSelectRegIn(NewSelectIn);
- return NewSelectIn;
-}
-
-static void checkRegOnlyPHIInputs(MachineFunction &MF) {
- for (auto &MBBI : MF) {
- for (MachineInstr &Instr : MBBI.instrs()) {
- if (Instr.isPHI()) {
- int numPreds = getPHINumInputs(Instr);
- for (int i = 0; i < numPreds; ++i) {
- assert(Instr.getOperand(i * 2 + 1).isReg() &&
- "PHI Operand not a register");
- }
- }
- }
- }
-}
-
-bool AMDGPUMachineCFGStructurizer::runOnMachineFunction(MachineFunction &MF) {
- const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
- const SIInstrInfo *TII = ST.getInstrInfo();
- TRI = ST.getRegisterInfo();
- MRI = &(MF.getRegInfo());
- initFallthroughMap(MF);
-
- checkRegOnlyPHIInputs(MF);
- LLVM_DEBUG(dbgs() << "----STRUCTURIZER START----\n");
- LLVM_DEBUG(MF.dump());
-
- Regions = &(getAnalysis<MachineRegionInfoPass>().getRegionInfo());
- LLVM_DEBUG(Regions->dump());
-
- RegionMRT *RTree = MRT::buildMRT(MF, Regions, TII, MRI);
- setRegionMRT(RTree);
- initializeSelectRegisters(RTree, 0, MRI, TII);
- LLVM_DEBUG(RTree->dump(TRI));
- bool result = structurizeRegions(RTree, true);
- delete RTree;
- LLVM_DEBUG(dbgs() << "----STRUCTURIZER END----\n");
- initFallthroughMap(MF);
- return result;
-}
-
-char AMDGPUMachineCFGStructurizerID = AMDGPUMachineCFGStructurizer::ID;
-
-INITIALIZE_PASS_BEGIN(AMDGPUMachineCFGStructurizer, "amdgpu-machine-cfg-structurizer",
- "AMDGPU Machine CFG Structurizer", false, false)
-INITIALIZE_PASS_DEPENDENCY(MachineRegionInfoPass)
-INITIALIZE_PASS_END(AMDGPUMachineCFGStructurizer, "amdgpu-machine-cfg-structurizer",
- "AMDGPU Machine CFG Structurizer", false, false)
-
-FunctionPass *llvm::createAMDGPUMachineCFGStructurizerPass() {
- return new AMDGPUMachineCFGStructurizer();
-}
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
index 2b9e431e86f893..5774045c0d36a6 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
@@ -263,13 +263,6 @@ static cl::opt<bool> EnableAMDGPUAliasAnalysis("enable-amdgpu-aa", cl::Hidden,
cl::desc("Enable AMDGPU Alias Analysis"),
cl::init(true));
-// Option to run late CFG structurizer
-static cl::opt<bool, true> LateCFGStructurize(
- "amdgpu-late-structurize",
- cl::desc("Enable late CFG structurization"),
- cl::location(AMDGPUTargetMachine::EnableLateStructurizeCFG),
- cl::Hidden);
-
// Disable structurizer-based control-flow lowering in order to test convergence
// control tokens. This should eventually be replaced by the wave-transform.
static cl::opt<bool, true> DisableStructurizer(
@@ -627,7 +620,6 @@ AMDGPUTargetMachine::AMDGPUTargetMachine(const Target &T, const Triple &TT,
}
}
-bool AMDGPUTargetMachine::EnableLateStructurizeCFG = false;
bool AMDGPUTargetMachine::EnableFunctionCalls = false;
bool AMDGPUTargetMachine::EnableLowerModuleLDS = true;
bool AMDGPUTargetMachine::DisableStructurizer = false;
@@ -1009,7 +1001,6 @@ class GCNPassConfig final : public AMDGPUPassConfig {
bool addRegAssignAndRewriteFast() override;
bool addRegAssignAndRewriteOptimized() override;
- void addPreRegAlloc() override;
bool addPreRewrite() override;
void addPostRegAlloc() override;
void addPreSched2() override;
@@ -1248,7 +1239,7 @@ bool GCNPassConfig::addPreISel() {
// Merge divergent exit nodes. StructurizeCFG won't recognize the multi-exit
// regions formed by them.
addPass(&AMDGPUUnifyDivergentExitNodesID);
- if (!LateCFGStructurize && !DisableStructurizer) {
+ if (!DisableStructurizer) {
if (EnableStructurizerWorkarounds) {
addPass(createFixIrreduciblePass());
addPass(createUnifyLoopExitsPass());
@@ -1256,7 +1247,7 @@ bool GCNPassConfig::addPreISel() {
addPass(createStructurizeCFGPass(false)); // true -> SkipUniformRegions
}
addPass(createAMDGPUAnnotateUniformValuesLegacy());
- if (!LateCFGStructurize && !DisableStructurizer) {
+ if (!DisableStructurizer) {
addPass(createSIAnnotateControlFlowLegacyPass());
// TODO: Move this right after structurizeCFG to avoid extra divergence
// analysis. This depends on stopping SIAnnotateControlFlow from making
@@ -1347,12 +1338,6 @@ bool GCNPassConfig::addGlobalInstructionSelect() {
return false;
}
-void GCNPassConfig::addPreRegAlloc() {
- if (LateCFGStructurize) {
- addPass(createAMDGPUMachineCFGStructurizerPass());
- }
-}
-
void GCNPassConfig::addFastRegAlloc() {
// FIXME: We have to disable the verifier here because of PHIElimination +
// TwoAddressInstructions disabling it.
@@ -1878,7 +1863,6 @@ void AMDGPUCodeGenPassBuilder::addCodeGenPrepare(AddIRPass &addPass) const {
}
void AMDGPUCodeGenPassBuilder::addPreISel(AddIRPass &addPass) const {
- const bool LateCFGStructurize = AMDGPUTargetMachine::EnableLateStructurizeCFG;
const bool DisableStructurizer = AMDGPUTargetMachine::DisableStructurizer;
const bool EnableStructurizerWorkarounds =
AMDGPUTargetMachine::EnableStructurizerWorkarounds;
@@ -1896,7 +1880,7 @@ void AMDGPUCodeGenPassBuilder::addPreISel(AddIRPass &addPass) const {
addPass(AMDGPUUnifyDivergentExitNodesPass());
- if (!LateCFGStructurize && !DisableStructurizer) {
+ if (!DisableStructurizer) {
if (EnableStructurizerWorkarounds) {
addPass(FixIrreduciblePass());
addPass(UnifyLoopExitsPass());
@@ -1907,7 +1891,7 @@ void AMDGPUCodeGenPassBuilder::addPreISel(AddIRPass &addPass) const {
addPass(AMDGPUAnnotateUniformValuesPass());
- if (!LateCFGStructurize && !DisableStructurizer) {
+ if (!DisableStructurizer) {
addPass(SIAnnotateControlFlowPass(TM));
// TODO: Move this right after structurizeCFG to avoid extra divergence
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.h b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.h
index 27ff0da5e812f4..c5d079ad7abb62 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.h
@@ -36,7 +36,6 @@ class AMDGPUTargetMachine : public LLVMTargetMachine {
StringRef getFeatureString(const Function &F) const;
public:
- static bool EnableLateStructurizeCFG;
static bool EnableFunctionCalls;
static bool EnableLowerModuleLDS;
static bool DisableStructurizer;
diff --git a/llvm/lib/Target/AMDGPU/CMakeLists.txt b/llvm/lib/Target/AMDGPU/CMakeLists.txt
index 18a8e917fbb71f..9ed7981b3da5ae 100644
--- a/llvm/lib/Target/AMDGPU/CMakeLists.txt
+++ b/llvm/lib/Target/AMDGPU/CMakeLists.txt
@@ -74,7 +74,6 @@ add_llvm_target(AMDGPUCodeGen
AMDGPULowerKernelArguments.cpp
AMDGPULowerKernelAttributes.cpp
AMDGPULowerModuleLDSPass.cpp
- AMDGPUMachineCFGStructurizer.cpp
AMDGPUMachineFunction.cpp
AMDGPUMachineModuleInfo.cpp
AMDGPUMacroFusion.cpp
diff --git a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
index 6dce41d1605fa4..84d25a1fbd2722 100644
--- a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
@@ -2867,8 +2867,7 @@ SIInstrInfo::getBranchDestBlock(const MachineInstr &MI) const {
bool SIInstrInfo::hasDivergentBranch(const MachineBasicBlock *MBB) const {
for (const MachineInstr &MI : MBB->terminators()) {
- if (MI.getOpcode() == AMDGPU::SI_NON_UNIFORM_BRCOND_PSEUDO ||
- MI.getOpcode() == AMDGPU::SI_IF || MI.getOpcode() == AMDGPU::SI_ELSE ||
+ if (MI.getOpcode() == AMDGPU::SI_IF || MI.getOpcode() == AMDGPU::SI_ELSE ||
MI.getOpcode() == AMDGPU::SI_LOOP)
return true;
}
@@ -3043,20 +3042,14 @@ bool SIInstrInfo::analyzeBranchImpl(MachineBasicBlock &MBB,
return false;
}
- MachineBasicBlock *CondBB = nullptr;
+ BranchPredicate Pred = getBranchPredicate(I->getOpcode());
+ if (Pred == INVALID_BR)
+ return true;
- if (I->getOpcode() == AMDGPU::SI_NON_UNIFORM_BRCOND_PSEUDO) {
- CondBB = I->getOperand(1).getMBB();
- Cond.push_back(I->getOperand(0));
- } else {
- BranchPredicate Pred = getBranchPredicate(I->getOpcode());
- if (Pred == INVALID_BR)
- return true;
+ MachineBasicBlock *CondBB = I->getOperand(0).getMBB();
+ Cond.push_back(MachineOperand::CreateImm(Pred));
+ Cond.push_back(I->getOperand(1)); // Save the branch register.
- CondBB = I->getOperand(0).getMBB();
- Cond.push_back(MachineOperand::CreateImm(Pred));
- Cond.push_back(I->getOperand(1)); // Save the branch register.
- }
++I;
if (I == MBB.end()) {
@@ -3159,13 +3152,6 @@ unsigned SIInstrInfo::insertBranch(MachineBasicBlock &MBB,
return 1;
}
- if(Cond.size() == 1 && Cond[0].isReg()) {
- BuildMI(&MBB, DL, get(AMDGPU::SI_NON_UNIFORM_BRCOND_PSEUDO))
- .add(Cond[0])
- .addMBB(TBB);
- return 1;
- }
-
assert(TBB && Cond[0].isImm());
unsigned Opcode
@@ -8772,79 +8758,6 @@ bool SIInstrInfo::mayAccessFlatAddressSpace(const MachineInstr &MI) const {
return false;
}
-bool SIInstrInfo::isNonUniformBranchInstr(MachineInstr &Branch) const {
- return Branch.getOpcode() == AMDGPU::SI_NON_UNIFORM_BRCOND_PSEUDO;
-}
-
-void SIInstrInfo::convertNonUniformIfRegion(MachineBasicBlock *IfEntry,
- MachineBasicBlock *IfEnd) const {
- MachineBasicBlock::iterator TI = IfEntry->getFirstTerminator();
- assert(TI != IfEntry->end());
-
- MachineInstr *Branch = &(*TI);
- MachineFunction *MF = IfEntry->getParent();
- MachineRegisterInfo &MRI = IfEntry->getParent()->getRegInfo();
-
- if (Branch->getOpcode() == AMDGPU::SI_NON_UNIFORM_BRCOND_PSEUDO) {
- Register DstReg = MRI.createVirtualRegister(RI.getBoolRC());
- MachineInstr *SIIF =
- BuildMI(*MF, Branch->getDebugLoc(), get(AMDGPU::SI_IF), DstReg)
- .add(Branch->getOperand(0))
- .add(Branch->getOperand(1));
- MachineInstr *SIEND =
- BuildMI(*MF, Branch->getDebugLoc(), get(AMDGPU::SI_END_CF))
- .addReg(DstReg);
-
- IfEntry->erase(TI);
- IfEntry->insert(IfEntry->end(), SIIF);
- IfEnd->insert(IfEnd->getFirstNonPHI(), SIEND);
- }
-}
-
-void SIInstrInfo::convertNonUniformLoopRegion(
- MachineBasicBlock *LoopEntry, MachineBasicBlock *LoopEnd) const {
- MachineBasicBlock::iterator TI = LoopEnd->getFirstTerminator();
- // We expect 2 terminators, one conditional and one unconditional.
- assert(TI != LoopEnd->end());
-
- MachineInstr *Branch = &(*TI);
- MachineFunction *MF = LoopEnd->getParent();
- MachineRegisterInfo &MRI = LoopEnd->getParent()->getRegInfo();
-
- if (Branch->getOpcode() == AMDGPU::SI_NON_UNIFORM_BRCOND_PSEUDO) {
-
- Register DstReg = MRI.createVirtualRegister(RI.getBoolRC());
- Register BackEdgeReg = MRI.createVirtualRegister(RI.getBoolRC());
- MachineInstrBuilder HeaderPHIBuilder =
- BuildMI(*(MF), Branch->getDebugLoc(), get(TargetOpcode::PHI), DstReg);
- for (MachineBasicBlock *PMBB : LoopEntry->predecessors()) {
- if (PMBB == LoopEnd) {
- HeaderPHIBuilder.addReg(BackEdgeReg);
- } else {
- Register ZeroReg = MRI.createVirtualRegister(RI.getBoolRC());
- materializeImmediate(*PMBB, PMBB->getFirstTerminator(), DebugLoc(),
- ZeroReg, 0);
- HeaderPHIBuilder.addReg(ZeroReg);
- }
- HeaderPHIBuilder.addMBB(PMBB);
- }
- MachineInstr *HeaderPhi = HeaderPHIBuilder;
- MachineInstr *SIIFBREAK = BuildMI(*(MF), Branch->getDebugLoc(),
- get(AMDGPU::SI_IF_BREAK), BackEdgeReg)
- .addReg(DstReg)
- .add(Branch->getOperand(0));
- MachineInstr *SILOOP =
- BuildMI(*(MF), Branch->getDebugLoc(), get(AMDGPU::SI_LOOP))
- .addReg(BackEdgeReg)
- .addMBB(LoopEntry);
-
- LoopEntry->insert(LoopEntry->begin(), HeaderPhi);
- LoopEnd->erase(TI);
- LoopEnd->insert(LoopEnd->end(), SIIFBREAK);
- LoopEnd->insert(LoopEnd->end(), SILOOP);
- }
-}
-
ArrayRef<std::pair<int, const char *>>
SIInstrInfo::getSerializableTargetIndices() const {
static const std::pair<int, const char *> TargetIndices[] = {
diff --git a/llvm/lib/Target/AMDGPU/SIInstrInfo.h b/llvm/lib/Target/AMDGPU/SIInstrInfo.h
index 91855fb14f6f37..badfd91c0b9727 100644
--- a/llvm/lib/Target/AMDGPU/SIInstrInfo.h
+++ b/llvm/lib/Target/AMDGPU/SIInstrInfo.h
@@ -1307,14 +1307,6 @@ class SIInstrInfo final : public AMDGPUGenInstrInfo {
bool mayAccessFlatAddressSpace(const MachineInstr &MI) const;
- bool isNonUniformBranchInstr(MachineInstr &Instr) const;
-
- void convertNonUniformIfRegion(MachineBasicBlock *IfEntry,
- MachineBasicBlock *IfEnd) const;
-
- void convertNonUniformLoopRegion(MachineBasicBlock *LoopEntry,
- MachineBasicBlock *LoopEnd) const;
-
std::pair<unsigned, unsigned>
decomposeMachineOperandsTargetFlags(unsigned TF) const override;
diff --git a/llvm/lib/Target/AMDGPU/SIInstructions.td b/llvm/lib/Target/AMDGPU/SIInstructions.td
index e7831d00a3a4a8..814d3182fb5df8 100644
--- a/llvm/lib/Target/AMDGPU/SIInstructions.td
+++ b/llvm/lib/Target/AMDGPU/SIInstructions.td
@@ -421,15 +421,6 @@ def IGLP_OPT : SPseudoInstSI<(outs), (ins i32imm:$mask),
let isTerminator = 1, isNotDuplicable = 1 in {
-let OtherPredicates = [EnableLateCFGStructurize] in {
- def SI_NON_UNIFORM_BRCOND_PSEUDO : CFPseudoInstSI <
- (outs),
- (ins SReg_1:$vcc, brtarget:$target),
- [(brcond i1:$vcc, bb:$target)]> {
- let Size = 12;
-}
-}
-
def SI_IF: CFPseudoInstSI <
(outs SReg_1:$dst), (ins SReg_1:$vcc, brtarget:$target),
[(set i1:$dst, (AMDGPUif i1:$vcc, bb:$target))], 1, 1> {
More information about the llvm-commits
mailing list