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Rewrite 73900 per Duncan's suggestion.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74082 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2009-06-24 17:11:31 +00:00
parent 71d259bc4b
commit 8539cfd30e
1 changed files with 9 additions and 19 deletions
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28
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -3181,27 +3181,17 @@ static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
} else {
// The type might not be legal for the target. This should only happen
// if the type is smaller than a legal type, as on PPC, so the right
// thing to do is generate a LoadExt/StoreTrunc pair.
// thing to do is generate a LoadExt/StoreTrunc pair. These simplify
// to Load/Store if NVT==VT.
// FIXME does the case above also need this?
if (TLI.isTypeLegal(VT)) {
Value = DAG.getLoad(VT, dl, Chain,
getMemBasePlusOffset(Src, SrcOff, DAG),
SrcSV, SrcSVOff + SrcOff, false, Align);
Store = DAG.getStore(Chain, dl, Value,
MVT NVT = TLI.getTypeToTransformTo(VT);
assert(NVT.bitsGE(VT));
Value = DAG.getExtLoad(ISD::EXTLOAD, dl, NVT, Chain,
getMemBasePlusOffset(Src, SrcOff, DAG),
SrcSV, SrcSVOff + SrcOff, VT, false, Align);
Store = DAG.getTruncStore(Chain, dl, Value,
getMemBasePlusOffset(Dst, DstOff, DAG),
DstSV, DstSVOff + DstOff, false, DstAlign);
} else {
MVT NVT = VT;
while (!TLI.isTypeLegal(NVT)) {
NVT = (MVT::SimpleValueType(NVT.getSimpleVT() + 1));
}
Value = DAG.getExtLoad(ISD::EXTLOAD, dl, NVT, Chain,
getMemBasePlusOffset(Src, SrcOff, DAG),
SrcSV, SrcSVOff + SrcOff, VT, false, Align);
Store = DAG.getTruncStore(Chain, dl, Value,
getMemBasePlusOffset(Dst, DstOff, DAG),
DstSV, DstSVOff + DstOff, VT, false, DstAlign);
}
DstSV, DstSVOff + DstOff, VT, false, DstAlign);
}
OutChains.push_back(Store);
SrcOff += VTSize;