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BBVectorize: Don't make calls to SE when the result is unused. 

SE was being called during the instruction-fusion process (when the result
is unreliable, and thus ignored). No functionality change is intended.

llvm-svn: 167037
This commit is contained in:
Hal Finkel 2012-10-30 18:55:49 +00:00
parent d3df665140
commit eac2887143
1 changed files with 5 additions and 2 deletions
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7
llvm/lib/Transforms/Vectorize/BBVectorize.cpp
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@ -547,7 +547,7 @@ namespace {
bool getPairPtrInfo(Instruction *I, Instruction *J,
Value *&IPtr, Value *&JPtr, unsigned &IAlignment, unsigned &JAlignment,
unsigned &IAddressSpace, unsigned &JAddressSpace,
int64_t &OffsetInElmts) {
int64_t &OffsetInElmts, bool ComputeOffset = true) {
OffsetInElmts = 0;
if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
LoadInst *LJ = cast<LoadInst>(J);
@ -567,6 +567,9 @@ namespace {
JAddressSpace = SJ->getPointerAddressSpace();
}
if (!ComputeOffset)
return true;
const SCEV *IPtrSCEV = SE->getSCEV(IPtr);
const SCEV *JPtrSCEV = SE->getSCEV(JPtr);
@ -1677,7 +1680,7 @@ namespace {
// been precomputed (OffsetInElmts must be unused here).
(void) getPairPtrInfo(I, J, IPtr, JPtr, IAlignment, JAlignment,
IAddressSpace, JAddressSpace,
OffsetInElmts);
OffsetInElmts, false);
// The pointer value is taken to be the one with the lowest offset.
Value *VPtr;