[llvm-commits] [llvm] r41150 - /llvm/trunk/lib/Target/Mips/MipsDelaySlotFiller.cpp
Bruno Cardoso Lopes
bruno.cardoso at gmail.com
Fri Aug 17 18:50:47 PDT 2007
Author: bruno
Date: Fri Aug 17 20:50:47 2007
New Revision: 41150
URL: http://llvm.org/viewvc/llvm-project?rev=41150&view=rev
Log:
A Pass to insert Nops on intructions with DelaySlot
Added:
llvm/trunk/lib/Target/Mips/MipsDelaySlotFiller.cpp
Added: llvm/trunk/lib/Target/Mips/MipsDelaySlotFiller.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Mips/MipsDelaySlotFiller.cpp?rev=41150&view=auto
==============================================================================
--- llvm/trunk/lib/Target/Mips/MipsDelaySlotFiller.cpp (added)
+++ llvm/trunk/lib/Target/Mips/MipsDelaySlotFiller.cpp Fri Aug 17 20:50:47 2007
@@ -0,0 +1,77 @@
+//===-- DelaySlotFiller.cpp - Mips delay slot filler ---------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Bruno Cardoso Lopes and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Simple pass to fills delay slots with NOPs.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "delay-slot-filler"
+
+#include "Mips.h"
+#include "MipsTargetMachine.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/ADT/Statistic.h"
+
+using namespace llvm;
+
+STATISTIC(FilledSlots, "Number of delay slots filled");
+
+namespace {
+ struct Filler : public MachineFunctionPass {
+
+ TargetMachine &TM;
+ const TargetInstrInfo *TII;
+
+ static char ID;
+ Filler(TargetMachine &tm)
+ : MachineFunctionPass((intptr_t)&ID), TM(tm), TII(tm.getInstrInfo()) { }
+
+ virtual const char *getPassName() const {
+ return "Mips Delay Slot Filler";
+ }
+
+ bool runOnMachineBasicBlock(MachineBasicBlock &MBB);
+ bool runOnMachineFunction(MachineFunction &F) {
+ bool Changed = false;
+ for (MachineFunction::iterator FI = F.begin(), FE = F.end();
+ FI != FE; ++FI)
+ Changed |= runOnMachineBasicBlock(*FI);
+ return Changed;
+ }
+
+ };
+ char Filler::ID = 0;
+} // end of anonymous namespace
+
+/// runOnMachineBasicBlock - Fill in delay slots for the given basic block.
+/// Currently, we fill delay slots with NOPs. We assume there is only one
+/// delay slot per delayed instruction.
+bool Filler::
+runOnMachineBasicBlock(MachineBasicBlock &MBB)
+{
+ bool Changed = false;
+ for (MachineBasicBlock::iterator I = MBB.begin(); I != MBB.end(); ++I)
+ if (TII->hasDelaySlot(I->getOpcode())) {
+ MachineBasicBlock::iterator J = I;
+ ++J;
+ BuildMI(MBB, J, TII->get(Mips::NOP));
+ ++FilledSlots;
+ Changed = true;
+ }
+ return Changed;
+}
+
+/// createMipsDelaySlotFillerPass - Returns a pass that fills in delay
+/// slots in Mips MachineFunctions
+FunctionPass *llvm::createMipsDelaySlotFillerPass(MipsTargetMachine &tm) {
+ return new Filler(tm);
+}
+
More information about the llvm-commits
mailing list