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Allow transforming this: 

%tmp = cast <4 x uint>* %testData to <4 x int>*         ; <<4 x int>*> [#uses=1]
        %tmp = load <4 x int>* %tmp             ; <<4 x int>> [#uses=1]

to this:

        %tmp = load <4 x uint>* %testData               ; <<4 x uint>> [#uses=1]
        %tmp = cast <4 x uint> %tmp to <4 x int>                ; <<4 x int>> [#uses=1]

llvm-svn: 27353
This commit is contained in:
Chris Lattner 2006-04-02 05:37:12 +00:00
parent f42d0aeda1
commit ebca476b27
1 changed files with 4 additions and 2 deletions
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6
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -6234,7 +6234,8 @@ static Instruction *InstCombineLoadCast(InstCombiner &IC, LoadInst &LI) {
if (const PointerType *SrcTy = dyn_cast<PointerType>(CastOp->getType())) {
const Type *SrcPTy = SrcTy->getElementType();
if (DestPTy->isInteger() || isa<PointerType>(DestPTy)) {
if (DestPTy->isInteger() || isa<PointerType>(DestPTy) ||
isa<PackedType>(DestPTy)) {
// If the source is an array, the code below will not succeed. Check to
// see if a trivial 'gep P, 0, 0' will help matters. Only do this for
// constants.
@ -6247,7 +6248,8 @@ static Instruction *InstCombineLoadCast(InstCombiner &IC, LoadInst &LI) {
SrcPTy = SrcTy->getElementType();
}
if ((SrcPTy->isInteger() || isa<PointerType>(SrcPTy)) &&
if ((SrcPTy->isInteger() || isa<PointerType>(SrcPTy) ||
isa<PackedType>(SrcPTy)) &&
// Do not allow turning this into a load of an integer, which is then
// casted to a pointer, this pessimizes pointer analysis a lot.
(isa<PointerType>(SrcPTy) == isa<PointerType>(LI.getType())) &&