Handle GEPs with all-zero indices in the same way we handle pointer-pointer bitcasts. Also, fix a potentia infinite loop.
This brings FastDSE to parity with old DSE on 175.vpr. llvm-svn: 39839
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@ -60,9 +60,18 @@ namespace {
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assert(isa<PointerType>(v->getType()) && "Translating a non-pointer type?");
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// See through pointer-to-pointer bitcasts
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while (BitCastInst* C = dyn_cast<BitCastInst>(v))
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if (isa<PointerType>(C->getSrcTy()))
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v = C->getOperand(0);
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while (isa<BitCastInst>(v) || isa<GetElementPtrInst>(v))
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if (BitCastInst* C = dyn_cast<BitCastInst>(v)) {
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if (isa<PointerType>(C->getSrcTy()))
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v = C->getOperand(0);
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else
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break;
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} else if (GetElementPtrInst* G = dyn_cast<GetElementPtrInst>(v)) {
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if (G->hasAllZeroIndices())
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v = G->getOperand(0);
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else
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break;
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}
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}
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// getAnalysisUsage - We require post dominance frontiers (aka Control
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