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Do more addrspacecast transforms that happen for bitcast.

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Makes addrspacecast (gep) do addrspacecast (gep) instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201376 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault
2014-02-14 00:49:12 +00:00
parent 0f2e653317
commit f222ebe86c
3 changed files with 82 additions and 8 deletions
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18
lib/Transforms/InstCombine/InstructionCombining.cpp
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@@ -1220,9 +1220,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
if (!StrippedPtrTy)
return 0;
if (StrippedPtr != PtrOp &&
StrippedPtrTy->getAddressSpace() == GEP.getPointerAddressSpace()) {
if (StrippedPtr != PtrOp) {
bool HasZeroPointerIndex = false;
if (ConstantInt *C = dyn_cast<ConstantInt>(GEP.getOperand(1)))
HasZeroPointerIndex = C->isZero();
@@ -1276,8 +1274,11 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
Value *NewGEP = GEP.isInBounds() ?
Builder->CreateInBoundsGEP(StrippedPtr, Idx, GEP.getName()) :
Builder->CreateGEP(StrippedPtr, Idx, GEP.getName());
// V and GEP are both pointer types --> BitCast
return new BitCastInst(NewGEP, GEP.getType());
if (StrippedPtrTy->getAddressSpace() == GEP.getPointerAddressSpace())
return new BitCastInst(NewGEP, GEP.getType());
return new AddrSpaceCastInst(NewGEP, GEP.getType());
}
// Transform things like:
@@ -1307,8 +1308,11 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
Value *NewGEP = GEP.isInBounds() && NSW ?
Builder->CreateInBoundsGEP(StrippedPtr, NewIdx, GEP.getName()) :
Builder->CreateGEP(StrippedPtr, NewIdx, GEP.getName());
// The NewGEP must be pointer typed, so must the old one -> BitCast
return new BitCastInst(NewGEP, GEP.getType());
if (StrippedPtrTy->getAddressSpace() == GEP.getPointerAddressSpace())
return new BitCastInst(NewGEP, GEP.getType());
return new AddrSpaceCastInst(NewGEP, GEP.getType());
}
}
}
@@ -1348,7 +1352,9 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
Builder->CreateInBoundsGEP(StrippedPtr, Off, GEP.getName()) :
Builder->CreateGEP(StrippedPtr, Off, GEP.getName());
// The NewGEP must be pointer typed, so must the old one -> BitCast
return new BitCastInst(NewGEP, GEP.getType());
if (StrippedPtrTy->getAddressSpace() == GEP.getPointerAddressSpace())
return new BitCastInst(NewGEP, GEP.getType());
return new AddrSpaceCastInst(NewGEP, GEP.getType());
}
}
}