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Implement a small optimization to handling of GEP's that are equivalent to casts.
This results in substantially reduced collapsing for some testcases git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10002 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -308,6 +308,24 @@ void GraphBuilder::visitGetElementPtrInst(User &GEP) {
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DSNodeHandle Value = getValueDest(*GEP.getOperand(0));
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if (Value.getNode() == 0) return;
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// As a special case, if all of the index operands of GEP are constant zeros,
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// handle this just like we handle casts (ie, don't do much).
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bool AllZeros = true;
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for (unsigned i = 1, e = GEP.getNumOperands(); i != e; ++i)
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if (GEP.getOperand(i) !=
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Constant::getNullValue(GEP.getOperand(i)->getType())) {
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AllZeros = false;
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break;
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}
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// If all of the indices are zero, the result points to the operand without
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// applying the type.
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if (AllZeros) {
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setDestTo(GEP, Value);
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return;
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}
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const PointerType *PTy = cast<PointerType>(GEP.getOperand(0)->getType());
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const Type *CurTy = PTy->getElementType();
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