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Bug fix in SetOperandsForMemInstr: handle leading zeros correctly 

when folding or not folding GEPs.

llvm-svn: 3245
This commit is contained in:
Vikram S. Adve 2002-08-04 20:51:05 +00:00
parent 1a1c3ed56d
commit b4a9685872
1 changed files with 9 additions and 5 deletions
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14
llvm/lib/Target/Sparc/SparcInstrSelection.cpp
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@ -995,18 +995,22 @@ SetOperandsForMemInstr(vector<MachineInstr*>& mvec,
// If we have only constant indices, fold chains of constant indices
// in this and any preceding GetElemPtr instructions.
bool foldedGEPs = false;
if (allConstantIndices &&
(ptrChild->getOpLabel() == Instruction::GetElementPtr ||
ptrChild->getOpLabel() == GetElemPtrIdx))
if (Value* newPtr = FoldGetElemChain((InstructionNode*) ptrChild, idxVec))
if (Value* newPtr = FoldGetElemChain((InstructionNode*) ptrChild, idxVec)) {
ptrVal = newPtr;
foldedGEPs = true;
}
// Append the index vector of the current instruction, if any.
// Discard any leading [0] index.
if (memInst->getNumIndices() > 0)
// Skip the leading [0] index if preceding GEPs were folded into this.
if (memInst->getNumIndices() > 0) {
assert((!foldedGEPs || IsZero(*memInst->idx_begin())) && "1st index not 0");
idxVec.insert(idxVec.end(),
memInst->idx_begin() + IsZero(*memInst->idx_begin()),
memInst->idx_end());
memInst->idx_begin() + foldedGEPs, memInst->idx_end());
}
// Now create the appropriate operands for the machine instruction
SetMemOperands_Internal(mvec, mvecI, vmInstrNode,