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Implement InstCombine/cast-propagate.ll
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12784 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2639,6 +2639,27 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) {
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if (GV->isConstant() && !GV->isExternal())
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if (Constant *V = GetGEPGlobalInitializer(GV->getInitializer(), CE))
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return ReplaceInstUsesWith(LI, V);
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// load (cast X) --> cast (load X) iff safe
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if (CastInst *CI = dyn_cast<CastInst>(Op)) {
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const Type *DestPTy = cast<PointerType>(CI->getType())->getElementType();
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if (const PointerType *SrcTy =
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dyn_cast<PointerType>(CI->getOperand(0)->getType())) {
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const Type *SrcPTy = SrcTy->getElementType();
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if (TD->getTypeSize(SrcPTy) == TD->getTypeSize(DestPTy) &&
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(SrcPTy->isInteger() || isa<PointerType>(SrcPTy)) &&
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(DestPTy->isInteger() || isa<PointerType>(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 the load, cast
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// the result of the loaded value.
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Value *NewLoad = InsertNewInstBefore(new LoadInst(CI->getOperand(0),
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CI->getName()), LI);
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// Now cast the result of the load.
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return new CastInst(NewLoad, LI.getType());
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}
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}
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}
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return 0;
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}
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