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Implement Regression/Transforms/InstCombine/getelementptr_cast.ll, which
occurs many times in crafty git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18273 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -3783,6 +3783,21 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
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GEP.setOperand(0, X);
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return &GEP;
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}
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} else if (GEP.getNumOperands() == 2) {
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// Transform things like:
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// %t = getelementptr ubyte* cast ([2 x sbyte]* %str to ubyte*), uint %V
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// into: %t1 = getelementptr [2 x sbyte*]* %str, int 0, uint %V; cast
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Constant *X = CE->getOperand(0);
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const Type *SrcElTy = cast<PointerType>(X->getType())->getElementType();
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const Type *ResElTy =cast<PointerType>(CE->getType())->getElementType();
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if (isa<ArrayType>(SrcElTy) &&
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TD->getTypeSize(cast<ArrayType>(SrcElTy)->getElementType()) ==
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TD->getTypeSize(ResElTy)) {
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Value *V = InsertNewInstBefore(
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new GetElementPtrInst(X, Constant::getNullValue(Type::IntTy),
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GEP.getOperand(1), GEP.getName()), GEP);
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return new CastInst(V, GEP.getType());
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}
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}
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}
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}
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