[llvm] r195339 - Revert r195317 (and r195333), "Teach ISel not to optimize 'optnone' functions."
NAKAMURA Takumi
geek4civic at gmail.com
Thu Nov 21 02:55:15 PST 2013
Author: chapuni
Date: Thu Nov 21 04:55:15 2013
New Revision: 195339
URL: http://llvm.org/viewvc/llvm-project?rev=195339&view=rev
Log:
Revert r195317 (and r195333), "Teach ISel not to optimize 'optnone' functions."
It broke, at least, i686 target. It is reproducible with "llc -mtriple=i686-unknown".
FYI, it didn't appear to add either "-O0" or "-fast-isel".
Removed:
llvm/trunk/test/CodeGen/Generic/isel-optnone.ll
Modified:
llvm/trunk/include/llvm/MC/MCCodeGenInfo.h
llvm/trunk/include/llvm/Target/TargetMachine.h
llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
llvm/trunk/lib/Target/TargetMachine.cpp
Modified: llvm/trunk/include/llvm/MC/MCCodeGenInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/MC/MCCodeGenInfo.h?rev=195339&r1=195338&r2=195339&view=diff
==============================================================================
--- llvm/trunk/include/llvm/MC/MCCodeGenInfo.h (original)
+++ llvm/trunk/include/llvm/MC/MCCodeGenInfo.h Thu Nov 21 04:55:15 2013
@@ -42,9 +42,6 @@ namespace llvm {
CodeModel::Model getCodeModel() const { return CMModel; }
CodeGenOpt::Level getOptLevel() const { return OptLevel; }
-
- // Allow overriding OptLevel on a per-function basis.
- void setOptLevel(CodeGenOpt::Level Level) { OptLevel = Level; }
};
} // namespace llvm
Modified: llvm/trunk/include/llvm/Target/TargetMachine.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Target/TargetMachine.h?rev=195339&r1=195338&r2=195339&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Target/TargetMachine.h (original)
+++ llvm/trunk/include/llvm/Target/TargetMachine.h Thu Nov 21 04:55:15 2013
@@ -75,8 +75,7 @@ protected: // Can only create subclasses
std::string TargetFS;
/// CodeGenInfo - Low level target information such as relocation model.
- /// Non-const to allow resetting optimization level per-function.
- MCCodeGenInfo *CodeGenInfo;
+ const MCCodeGenInfo *CodeGenInfo;
/// AsmInfo - Contains target specific asm information.
///
@@ -214,9 +213,6 @@ public:
/// Default, or Aggressive.
CodeGenOpt::Level getOptLevel() const;
- /// \brief Overrides the optimization level.
- void setOptLevel(CodeGenOpt::Level Level) const;
-
void setFastISel(bool Enable) { Options.EnableFastISel = Enable; }
bool shouldPrintMachineCode() const { return Options.PrintMachineCode; }
Modified: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp?rev=195339&r1=195338&r2=195339&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp Thu Nov 21 04:55:15 2013
@@ -223,39 +223,6 @@ defaultListDAGScheduler("default", "Best
namespace llvm {
//===--------------------------------------------------------------------===//
- /// \brief This struct is used by SelectionDAGISel to temporarily override
- /// the optimization level on a per-function basis.
- class OptLevelChanger {
- SelectionDAGISel &IS;
- CodeGenOpt::Level SavedOptLevel;
-
- public:
- OptLevelChanger(SelectionDAGISel &ISel,
- CodeGenOpt::Level NewOptLevel) : IS(ISel) {
- SavedOptLevel = IS.OptLevel;
- if (NewOptLevel == SavedOptLevel)
- return;
- IS.OptLevel = NewOptLevel;
- IS.TM.setOptLevel(NewOptLevel);
- DEBUG(dbgs() << "\nChanging optimization level for Function "
- << IS.MF->getFunction()->getName() << "\n");
- DEBUG(dbgs() << "\tBefore: -O" << SavedOptLevel
- << " ; After: -O" << NewOptLevel << "\n");
- }
-
- ~OptLevelChanger() {
- if (IS.OptLevel == SavedOptLevel)
- return;
- DEBUG(dbgs() << "\nRestoring optimization level for Function "
- << IS.MF->getFunction()->getName() << "\n");
- DEBUG(dbgs() << "\tBefore: -O" << IS.OptLevel
- << " ; After: -O" << SavedOptLevel << "\n");
- IS.OptLevel = SavedOptLevel;
- IS.TM.setOptLevel(SavedOptLevel);
- }
- };
-
- //===--------------------------------------------------------------------===//
/// createDefaultScheduler - This creates an instruction scheduler appropriate
/// for the target.
ScheduleDAGSDNodes* createDefaultScheduler(SelectionDAGISel *IS,
@@ -403,12 +370,6 @@ bool SelectionDAGISel::runOnMachineFunct
ST.resetSubtargetFeatures(MF);
TM.resetTargetOptions(MF);
- // Reset OptLevel to None for optnone functions.
- CodeGenOpt::Level NewOptLevel = OptLevel;
- if (Fn.hasFnAttribute(Attribute::OptimizeNone))
- NewOptLevel = CodeGenOpt::None;
- OptLevelChanger OLC(*this, NewOptLevel);
-
DEBUG(dbgs() << "\n\n\n=== " << Fn.getName() << "\n");
SplitCriticalSideEffectEdges(const_cast<Function&>(Fn), this);
@@ -987,7 +948,7 @@ static void collectFailStats(const Instr
void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
// Initialize the Fast-ISel state, if needed.
FastISel *FastIS = 0;
- if (TM.Options.EnableFastISel || Fn.hasFnAttribute(Attribute::OptimizeNone))
+ if (TM.Options.EnableFastISel)
FastIS = getTargetLowering()->createFastISel(*FuncInfo, LibInfo);
// Iterate over all basic blocks in the function.
Modified: llvm/trunk/lib/Target/TargetMachine.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/TargetMachine.cpp?rev=195339&r1=195338&r2=195339&view=diff
==============================================================================
--- llvm/trunk/lib/Target/TargetMachine.cpp (original)
+++ llvm/trunk/lib/Target/TargetMachine.cpp Thu Nov 21 04:55:15 2013
@@ -164,11 +164,6 @@ CodeGenOpt::Level TargetMachine::getOptL
return CodeGenInfo->getOptLevel();
}
-void TargetMachine::setOptLevel(CodeGenOpt::Level Level) const {
- if (CodeGenInfo)
- CodeGenInfo->setOptLevel(Level);
-}
-
bool TargetMachine::getAsmVerbosityDefault() {
return AsmVerbosityDefault;
}
Removed: llvm/trunk/test/CodeGen/Generic/isel-optnone.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/Generic/isel-optnone.ll?rev=195338&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/Generic/isel-optnone.ll (original)
+++ llvm/trunk/test/CodeGen/Generic/isel-optnone.ll (removed)
@@ -1,32 +0,0 @@
-; RUN: llc -debug < %s -o /dev/null 2>&1 | FileCheck %s
-; REQUIRES: asserts
-
-; Verify that the backend correctly overrides the optimization level
-; of optnone functions during instruction selection.
-
-define float @foo(float %x) #0 {
-entry:
- %add = fadd fast float %x, %x
- %add1 = fadd fast float %add, %x
- ret float %add1
-}
-
-; CHECK-NOT: Changing optimization level for Function foo
-; CHECK-NOT: Restoring optimization level for Function foo
-
-; Function Attrs: noinline optnone
-define float @fooWithOptnone(float %x) #1 {
-entry:
- %add = fadd fast float %x, %x
- %add1 = fadd fast float %add, %x
- ret float %add1
-}
-
-; CHECK: Changing optimization level for Function fooWithOptnone
-; CHECK-NEXT: Before: -O2 ; After: -O0
-
-; CHECK: Restoring optimization level for Function fooWithOptnone
-; CHECK-NEXT: Before: -O0 ; After: -O2
-
-attributes #0 = { "unsafe-fp-math"="true" }
-attributes #1 = { noinline optnone "unsafe-fp-math"="true" }
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