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misc cleanup

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80507 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-08-30 20:36:46 +00:00
parent 8a67ac525e
commit 963f4ba826
1 changed files with 13 additions and 13 deletions
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26
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -10784,8 +10784,7 @@ Instruction *InstCombiner::visitPHINode(PHINode &PN) {
Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
Value *PtrOp = GEP.getOperand(0);
// Is it 'getelementptr %P, i32 0' or 'getelementptr %P'
// If so, eliminate the noop.
// Eliminate 'getelementptr %P, i32 0' and 'getelementptr %P', they are noops.
if (GEP.getNumOperands() == 1)
return ReplaceInstUsesWith(GEP, PtrOp);
@ -10896,15 +10895,15 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// Handle gep(bitcast x) and gep(gep x, 0, 0, 0).
if (Value *X = getBitCastOperand(PtrOp)) {
assert(isa<PointerType>(X->getType()) && "Must be cast from pointer");
// Transform: GEP (bitcast [10 x i8]* X to [0 x i8]*), i32 0, ...
// into : GEP [10 x i8]* X, i32 0, ...
//
// Likewise, transform: GEP (bitcast i8* X to [0 x i8]*), i32 0, ...
// into : GEP i8* X, ...
//
// This occurs when the program declares an array extern like "int X[];"
if (HasZeroPointerIndex) {
// transform: GEP (bitcast [10 x i8]* X to [0 x i8]*), i32 0, ...
// into : GEP [10 x i8]* X, i32 0, ...
//
// Likewise, transform: GEP (bitcast i8* X to [0 x i8]*), i32 0, ...
// into : GEP i8* X, ...
//
// This occurs when the program declares an array extern like "int X[];"
const PointerType *CPTy = cast<PointerType>(PtrOp->getType());
const PointerType *XTy = cast<PointerType>(X->getType());
if (const ArrayType *CATy =
@ -10919,8 +10918,9 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
if (cast<GEPOperator>(&GEP)->isInBounds())
cast<GEPOperator>(NewGEP)->setIsInBounds(true);
return NewGEP;
} else if (const ArrayType *XATy =
dyn_cast<ArrayType>(XTy->getElementType())) {
}
if (const ArrayType *XATy = dyn_cast<ArrayType>(XTy->getElementType())){
// GEP (bitcast [10 x i8]* X to [0 x i8]*), i32 0, ... ?
if (CATy->getElementType() == XATy->getElementType()) {
// -> GEP [10 x i8]* X, i32 0, ...
@ -11271,7 +11271,7 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) {
LI.setAlignment(KnownAlign);
}
// load (cast X) --> cast (load X) iff safe
// load (cast X) --> cast (load X) iff safe.
if (isa<CastInst>(Op))
if (Instruction *Res = InstCombineLoadCast(*this, LI, TD))
return Res;