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Revise the store V, (cast P) -> store (cast V) -> P transform.
We only want to do this if the src and destination types have the same bit width. This patch uses TargetData::getTypeSizeInBits() instead of making a special case for integer types and avoiding the transform if they don't match. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33414 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -8192,10 +8192,9 @@ static Instruction *InstCombineStoreToCast(InstCombiner &IC, StoreInst &SI) {
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SrcPTy = SrcTy->getElementType();
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}
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if (((SrcPTy->isInteger() && SrcPTy != Type::Int1Ty) ||
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isa<PointerType>(SrcPTy)) &&
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IC.getTargetData().getTypeSize(SrcPTy) ==
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IC.getTargetData().getTypeSize(DestPTy)) {
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if ((SrcPTy->isInteger() || isa<PointerType>(SrcPTy)) &&
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IC.getTargetData().getTypeSizeInBits(SrcPTy) ==
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IC.getTargetData().getTypeSizeInBits(DestPTy)) {
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// Okay, we are casting from one integer or pointer type to another of
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// the same size. Instead of casting the pointer before
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@ -8208,13 +8207,9 @@ static Instruction *InstCombineStoreToCast(InstCombiner &IC, StoreInst &SI) {
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if (isa<PointerType>(CastDstTy)) {
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if (CastSrcTy->isInteger())
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opcode = Instruction::IntToPtr;
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} else if (const IntegerType* DITy = dyn_cast<IntegerType>(CastDstTy)) {
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} else if (isa<IntegerType>(CastDstTy)) {
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if (isa<PointerType>(SIOp0->getType()))
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opcode = Instruction::PtrToInt;
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else if (const IntegerType* SITy = dyn_cast<IntegerType>(CastSrcTy))
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if (SITy->getBitWidth() != DITy->getBitWidth())
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return 0; // Don't do this transform on unequal bit widths.
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// else, BitCast is fine
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}
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if (Constant *C = dyn_cast<Constant>(SIOp0))
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NewCast = ConstantExpr::getCast(opcode, C, CastDstTy);
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