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Remove CodeGenLICM. It's largely obsoleted by MachineLICM's new ability

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to unfold loop-invariant loads.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85657 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-10-31 14:35:41 +00:00
parent 576fd76a68
commit 9f476e3179
5 changed files with 1 additions and 126 deletions
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1
include/llvm/LinkAllPasses.h
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@ -123,7 +123,6 @@ namespace {
(void) llvm::createNullProfilerRSPass();
(void) llvm::createRSProfilingPass();
(void) llvm::createInstCountPass();
(void) llvm::createCodeGenLICMPass();
(void) llvm::createCodeGenPreparePass();
(void) llvm::createGVNPass();
(void) llvm::createMemCpyOptPass();

6
include/llvm/Transforms/Scalar.h
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@ -305,12 +305,6 @@ FunctionPass *createSimplifyHalfPowrLibCallsPass();
//
FunctionPass *createCodeGenPreparePass(const TargetLowering *TLI = 0);
//===----------------------------------------------------------------------===//
//
// CodeGenLICM - This pass performs late LICM; hoisting constants out of loops.
//
Pass *createCodeGenLICMPass();
//===----------------------------------------------------------------------===//
//
// InstructionNamer - Give any unnamed non-void instructions "tmp" names.

7
lib/CodeGen/LLVMTargetMachine.cpp
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@ -39,8 +39,6 @@ static cl::opt<bool> PrintEmittedAsm("print-emitted-asm", cl::Hidden,
cl::desc("Dump emitter generated instructions as assembly"));
static cl::opt<bool> PrintGCInfo("print-gc", cl::Hidden,
cl::desc("Dump garbage collector data"));
static cl::opt<bool> HoistConstants("hoist-constants", cl::Hidden,
cl::desc("Hoist constants out of loops"));
static cl::opt<bool> VerifyMachineCode("verify-machineinstrs", cl::Hidden,
cl::desc("Verify generated machine code"),
cl::init(getenv("LLVM_VERIFY_MACHINEINSTRS")!=NULL));
@ -255,11 +253,8 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
// Make sure that no unreachable blocks are instruction selected.
PM.add(createUnreachableBlockEliminationPass());
if (OptLevel != CodeGenOpt::None) {
if (HoistConstants)
PM.add(createCodeGenLICMPass());
if (OptLevel != CodeGenOpt::None)
PM.add(createCodeGenPreparePass(getTargetLowering()));
}
PM.add(createStackProtectorPass(getTargetLowering()));

1
lib/Transforms/Scalar/CMakeLists.txt
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@ -2,7 +2,6 @@ add_llvm_library(LLVMScalarOpts
ABCD.cpp
ADCE.cpp
BasicBlockPlacement.cpp
CodeGenLICM.cpp
CodeGenPrepare.cpp
CondPropagate.cpp
ConstantProp.cpp

112
lib/Transforms/Scalar/CodeGenLICM.cpp
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@ -1,112 +0,0 @@
//===- CodeGenLICM.cpp - LICM a function for code generation --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This function performs late LICM, hoisting constants out of loops that
// are not valid immediates. It should not be followed by instcombine,
// because instcombine would quickly stuff the constants back into the loop.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "codegen-licm"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/LLVMContext.h"
#include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/ADT/DenseMap.h"
using namespace llvm;
namespace {
class CodeGenLICM : public LoopPass {
virtual bool runOnLoop(Loop *L, LPPassManager &LPM);
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
public:
static char ID; // Pass identification, replacement for typeid
explicit CodeGenLICM() : LoopPass(&ID) {}
};
}
char CodeGenLICM::ID = 0;
static RegisterPass<CodeGenLICM> X("codegen-licm",
"hoist constants out of loops");
Pass *llvm::createCodeGenLICMPass() {
return new CodeGenLICM();
}
bool CodeGenLICM::runOnLoop(Loop *L, LPPassManager &) {
bool Changed = false;
// Only visit outermost loops.
if (L->getParentLoop()) return Changed;
Instruction *PreheaderTerm = L->getLoopPreheader()->getTerminator();
DenseMap<Constant *, BitCastInst *> HoistedConstants;
for (Loop::block_iterator I = L->block_begin(), E = L->block_end();
I != E; ++I) {
BasicBlock *BB = *I;
for (BasicBlock::iterator BBI = BB->begin(), BBE = BB->end();
BBI != BBE; ++BBI) {
Instruction *I = BBI;
// TODO: For now, skip all intrinsic instructions, because some of them
// can require their operands to be constants, and we don't want to
// break that.
if (isa<IntrinsicInst>(I))
continue;
// LLVM represents fneg as -0.0-x; don't hoist the -0.0 out.
if (BinaryOperator::isFNeg(I) ||
BinaryOperator::isNeg(I) ||
BinaryOperator::isNot(I))
continue;
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
// Don't hoist out switch case constants.
if (isa<SwitchInst>(I) && i == 1)
break;
// Don't hoist out shuffle masks.
if (isa<ShuffleVectorInst>(I) && i == 2)
break;
Value *Op = I->getOperand(i);
Constant *C = dyn_cast<Constant>(Op);
if (!C) continue;
// TODO: Ask the target which constants are legal. This would allow
// us to add support for hoisting ConstantInts and GlobalValues too.
if (isa<ConstantFP>(C) ||
isa<ConstantVector>(C) ||
isa<ConstantAggregateZero>(C)) {
BitCastInst *&BC = HoistedConstants[C];
if (!BC)
BC = new BitCastInst(C, C->getType(), "hoist", PreheaderTerm);
I->setOperand(i, BC);
Changed = true;
}
}
}
}
return Changed;
}
void CodeGenLICM::getAnalysisUsage(AnalysisUsage &AU) const {
// This pass preserves just about everything. List some popular things here.
AU.setPreservesCFG();
AU.addPreservedID(LoopSimplifyID);
AU.addPreserved<LoopInfo>();
AU.addPreserved<AliasAnalysis>();
AU.addPreserved("scalar-evolution");
AU.addPreserved("iv-users");
AU.addPreserved("lda");
AU.addPreserved("live-values");
// Hoisting requires a loop preheader.
AU.addRequiredID(LoopSimplifyID);
}