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vectorizer: Add support for reading and writing from the same memory location.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166255 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-10-19 01:24:18 +00:00
parent cbd9a19b5d
commit 89e7b356f2
2 changed files with 44 additions and 2 deletions
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11
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -715,6 +715,7 @@ bool LoopVectorizationLegality::canVectorizeBlock(BasicBlock &BB) {
ValueVector Reads;
ValueVector Writes;
SmallPtrSet<Value*, 16> AnalyzedPtrs;
unsigned NumPhis = 0;
for (BasicBlock::iterator it = BB.begin(), e = BB.end(); it != e; ++it) {
Instruction *I = it;
@ -766,7 +767,10 @@ bool LoopVectorizationLegality::canVectorizeBlock(BasicBlock &BB) {
DEBUG(dbgs() << "LV: Found a non-simple load.\n");
return false;
}
GetUnderlyingObjects(Ld->getPointerOperand(), Reads, DL);
Value* Ptr = Ld->getPointerOperand();
if (AnalyzedPtrs.insert(Ptr))
GetUnderlyingObjects(Ptr, Reads, DL);
}
// Record store pointers. Abort on all other instructions that write to
@ -778,7 +782,10 @@ bool LoopVectorizationLegality::canVectorizeBlock(BasicBlock &BB) {
DEBUG(dbgs() << "LV: Found a non-simple store.\n");
return false;
}
GetUnderlyingObjects(St->getPointerOperand(), Writes, DL);
Value* Ptr = St->getPointerOperand();
if (AnalyzedPtrs.insert(Ptr))
GetUnderlyingObjects(St->getPointerOperand(), Writes, DL);
}
// We still don't handle functions.