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revert r123149, reenabling an improvement to memcpyopt that wasn't

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the source of the bootstrap problem.

llvm-svn: 123298
This commit is contained in:
Chris Lattner 2011-01-12 01:43:46 +00:00
parent 033b288e84
commit c7a5a12af5
1 changed files with 2 additions and 4 deletions
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6
lib/Transforms/Scalar/MemCpyOptimizer.cpp
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@ -71,14 +71,13 @@ static int64_t GetOffsetFromIndex(const GetElementPtrInst *GEP, unsigned Idx,
/// be &A[42], and Ptr2 might be &A[40]. In this case offset would be -8.
static bool IsPointerOffset(Value *Ptr1, Value *Ptr2, int64_t &Offset,
const TargetData &TD) {
//Ptr1 = Ptr1->stripPointerCasts();
//Ptr2 = Ptr2->stripPointerCasts();
Ptr1 = Ptr1->stripPointerCasts();
Ptr2 = Ptr2->stripPointerCasts();
GetElementPtrInst *GEP1 = dyn_cast<GetElementPtrInst>(Ptr1);
GetElementPtrInst *GEP2 = dyn_cast<GetElementPtrInst>(Ptr2);
bool VariableIdxFound = false;
#if 0
// If one pointer is a GEP and the other isn't, then see if the GEP is a
// constant offset from the base, as in "P" and "gep P, 1".
if (GEP1 && GEP2 == 0 && GEP1->getOperand(0)->stripPointerCasts() == Ptr2) {
@ -90,7 +89,6 @@ static bool IsPointerOffset(Value *Ptr1, Value *Ptr2, int64_t &Offset,
Offset = GetOffsetFromIndex(GEP2, 1, VariableIdxFound, TD);
return !VariableIdxFound;
}
#endif
// Right now we handle the case when Ptr1/Ptr2 are both GEPs with an identical
// base. After that base, they may have some number of common (and