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author | Dimitry Andric <dim@FreeBSD.org> | 2017-12-20 14:16:56 +0000 |
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committer | Dimitry Andric <dim@FreeBSD.org> | 2017-12-20 14:16:56 +0000 |
commit | 2cab237b5dbfe1b3e9c7aa7a3c02d2b98fcf7462 (patch) | |
tree | 524fe828571f81358bba62fdb6d04c6e5e96a2a4 /contrib/llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp | |
parent | 6c7828a2807ea5e50c79ca42dbedf2b589ce63b2 (diff) | |
parent | 044eb2f6afba375a914ac9d8024f8f5142bb912e (diff) | |
download | src-2cab237b5dbfe1b3e9c7aa7a3c02d2b98fcf7462.tar.gz src-2cab237b5dbfe1b3e9c7aa7a3c02d2b98fcf7462.zip |
Merge llvm trunk r321017 to contrib/llvm.
Notes
Notes:
svn path=/projects/clang600-import/; revision=327023
Diffstat (limited to 'contrib/llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp')
-rw-r--r-- | contrib/llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp b/contrib/llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp new file mode 100644 index 000000000000..9501f0f89b81 --- /dev/null +++ b/contrib/llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp @@ -0,0 +1,95 @@ +//===--------- PPCPreEmitPeephole.cpp - Late peephole optimizations -------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// A pre-emit peephole for catching opportunities introduced by late passes such +// as MachineBlockPlacement. +// +//===----------------------------------------------------------------------===// + +#include "PPC.h" +#include "PPCInstrInfo.h" +#include "PPCSubtarget.h" +#include "llvm/ADT/DenseMap.h" +#include "llvm/ADT/Statistic.h" +#include "llvm/CodeGen/LivePhysRegs.h" +#include "llvm/CodeGen/MachineFunctionPass.h" +#include "llvm/CodeGen/MachineInstrBuilder.h" +#include "llvm/CodeGen/MachineRegisterInfo.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/ADT/Statistic.h" +#include "llvm/Support/Debug.h" + +using namespace llvm; + +#define DEBUG_TYPE "ppc-pre-emit-peephole" + +STATISTIC(NumRRConvertedInPreEmit, + "Number of r+r instructions converted to r+i in pre-emit peephole"); +STATISTIC(NumRemovedInPreEmit, + "Number of instructions deleted in pre-emit peephole"); + +static cl::opt<bool> +RunPreEmitPeephole("ppc-late-peephole", cl::Hidden, cl::init(false), + cl::desc("Run pre-emit peephole optimizations.")); + +namespace { + class PPCPreEmitPeephole : public MachineFunctionPass { + public: + static char ID; + PPCPreEmitPeephole() : MachineFunctionPass(ID) { + initializePPCPreEmitPeepholePass(*PassRegistry::getPassRegistry()); + } + + void getAnalysisUsage(AnalysisUsage &AU) const override { + MachineFunctionPass::getAnalysisUsage(AU); + } + + MachineFunctionProperties getRequiredProperties() const override { + return MachineFunctionProperties().set( + MachineFunctionProperties::Property::NoVRegs); + } + + bool runOnMachineFunction(MachineFunction &MF) override { + if (skipFunction(MF.getFunction()) || !RunPreEmitPeephole) + return false; + bool Changed = false; + const PPCInstrInfo *TII = MF.getSubtarget<PPCSubtarget>().getInstrInfo(); + SmallVector<MachineInstr *, 4> InstrsToErase; + for (MachineBasicBlock &MBB : MF) { + for (MachineInstr &MI : MBB) { + MachineInstr *DefMIToErase = nullptr; + if (TII->convertToImmediateForm(MI, &DefMIToErase)) { + Changed = true; + NumRRConvertedInPreEmit++; + DEBUG(dbgs() << "Converted instruction to imm form: "); + DEBUG(MI.dump()); + if (DefMIToErase) { + InstrsToErase.push_back(DefMIToErase); + } + } + } + } + for (MachineInstr *MI : InstrsToErase) { + DEBUG(dbgs() << "PPC pre-emit peephole: erasing instruction: "); + DEBUG(MI->dump()); + MI->eraseFromParent(); + NumRemovedInPreEmit++; + } + return Changed; + } + }; +} + +INITIALIZE_PASS(PPCPreEmitPeephole, DEBUG_TYPE, "PowerPC Pre-Emit Peephole", + false, false) +char PPCPreEmitPeephole::ID = 0; + +FunctionPass *llvm::createPPCPreEmitPeepholePass() { + return new PPCPreEmitPeephole(); +} |