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R600/SI: Wrap local memory pointer in AssertZExt on SI

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These pointers are really just offsets and they will always be
less than 16-bits.  Using AssertZExt allows us to use computeKnownBits
to prove that these values are positive.  We will use this information
in a later commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216277 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard 2014-08-22 18:49:31 +00:00
parent 9048dc6867
commit 80544654f3
1 changed files with 12 additions and 0 deletions
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12
lib/Target/R600/SIISelLowering.cpp
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@ -504,6 +504,18 @@ SDValue SITargetLowering::LowerFormalArguments(
SDValue Arg = LowerParameter(DAG, VT, MemVT, DL, DAG.getRoot(),
36 + VA.getLocMemOffset(),
Ins[i].Flags.isSExt());
const PointerType *ParamTy =
dyn_cast<PointerType>(FType->getParamType(Ins[i].OrigArgIndex));
if (Subtarget->getGeneration() == AMDGPUSubtarget::SOUTHERN_ISLANDS &&
ParamTy && ParamTy->getAddressSpace() == AMDGPUAS::LOCAL_ADDRESS) {
// On SI local pointers are just offsets into LDS, so they are always
// less than 16-bits. On CI and newer they could potentially be
// real pointers, so we can't guarantee their size.
Arg = DAG.getNode(ISD::AssertZext, DL, Arg.getValueType(), Arg,
DAG.getValueType(MVT::i16));
}
InVals.push_back(Arg);
continue;
}