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Teach the alignment handling code to look through constant expr casts and GEPs
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26580 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -5285,11 +5285,17 @@ static unsigned GetKnownAlignment(Value *V, TargetData *TD) {
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}
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}
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return Align;
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} else if (CastInst *CI = dyn_cast<CastInst>(V)) {
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} else if (isa<CastInst>(V) ||
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(isa<ConstantExpr>(V) &&
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cast<ConstantExpr>(V)->getOpcode() == Instruction::Cast)) {
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User *CI = cast<User>(V);
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if (isa<PointerType>(CI->getOperand(0)->getType()))
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return GetKnownAlignment(CI->getOperand(0), TD);
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return 0;
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} else if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(V)) {
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} else if (isa<GetElementPtrInst>(V) ||
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(isa<ConstantExpr>(V) &&
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cast<ConstantExpr>(V)->getOpcode()==Instruction::GetElementPtr)) {
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User *GEPI = cast<User>(V);
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unsigned BaseAlignment = GetKnownAlignment(GEPI->getOperand(0), TD);
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if (BaseAlignment == 0) return 0;
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@ -5311,8 +5317,10 @@ static unsigned GetKnownAlignment(Value *V, TargetData *TD) {
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const Type *BasePtrTy = GEPI->getOperand(0)->getType();
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if (TD->getTypeAlignment(cast<PointerType>(BasePtrTy)->getElementType())
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<= BaseAlignment)
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return TD->getTypeAlignment(GEPI->getType()->getElementType());
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<= BaseAlignment) {
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const Type *GEPTy = GEPI->getType();
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return TD->getTypeAlignment(cast<PointerType>(GEPTy)->getElementType());
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}
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return 0;
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}
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return 0;
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