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* Convert getelementptr/store pairs into a single store

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* Convert getelementptr/load pairs into a single load


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1075 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2001-11-01 03:12:34 +00:00
parent d32a96121b
commit 8d38e54c2f
1 changed files with 26 additions and 1 deletions
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27
lib/Transforms/LevelRaise.cpp
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@ -438,7 +438,7 @@ static bool PeepholeMallocInst(BasicBlock *BB, BasicBlock::iterator &BI) {
static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
Instruction *I = *BI;
if (I->use_size() == 0) return false;
if (I->use_size() == 0 && I->getType() != Type::VoidTy) return false;
if (CastInst *CI = dyn_cast<CastInst>(I)) {
Value *Src = CI->getOperand(0);
@ -484,6 +484,31 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
} else if (MallocInst *MI = dyn_cast<MallocInst>(I)) {
if (PeepholeMallocInst(BB, BI)) return true;
} else if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
Value *Val = SI->getOperand(0);
Value *Pointer = SI->getPtrOperand();
if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Pointer)) {
PRINT_PEEPHOLE2("gep-store:in", GEP, SI);
ReplaceInstWithInst(BB->getInstList(), BI,
SI = new StoreInst(Val, GEP->getPtrOperand(),
GEP->getIndexVec()));
PRINT_PEEPHOLE1("gep-store:out", SI);
return true;
}
} else if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
Value *Pointer = LI->getPtrOperand();
if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Pointer)) {
PRINT_PEEPHOLE2("gep-load:in", GEP, LI);
ReplaceInstWithInst(BB->getInstList(), BI,
LI = new LoadInst(GEP->getPtrOperand(),
GEP->getIndexVec()));
PRINT_PEEPHOLE1("gep-load:out", LI);
return true;
}
} else if (I->getOpcode() == Instruction::Add &&
isa<CastInst>(I->getOperand(1))) {