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another random stab in the dark trying to fix llvm-gcc-i386-linux-selfhost 

llvm-svn: 123149
This commit is contained in:
Chris Lattner 2011-01-10 02:34:11 +00:00
parent ec1387cf4b
commit 88bc848ab6
1 changed files with 4 additions and 2 deletions
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6
llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
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@ -71,13 +71,14 @@ 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) {
@ -89,6 +90,7 @@ 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