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Rewrite 73900 per Duncan's suggestion.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74082 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -3181,27 +3181,17 @@ static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
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} else {
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// The type might not be legal for the target. This should only happen
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// if the type is smaller than a legal type, as on PPC, so the right
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// thing to do is generate a LoadExt/StoreTrunc pair.
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// thing to do is generate a LoadExt/StoreTrunc pair. These simplify
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// to Load/Store if NVT==VT.
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// FIXME does the case above also need this?
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if (TLI.isTypeLegal(VT)) {
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Value = DAG.getLoad(VT, dl, Chain,
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getMemBasePlusOffset(Src, SrcOff, DAG),
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SrcSV, SrcSVOff + SrcOff, false, Align);
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Store = DAG.getStore(Chain, dl, Value,
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MVT NVT = TLI.getTypeToTransformTo(VT);
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assert(NVT.bitsGE(VT));
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Value = DAG.getExtLoad(ISD::EXTLOAD, dl, NVT, Chain,
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getMemBasePlusOffset(Src, SrcOff, DAG),
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SrcSV, SrcSVOff + SrcOff, VT, false, Align);
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Store = DAG.getTruncStore(Chain, dl, Value,
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getMemBasePlusOffset(Dst, DstOff, DAG),
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DstSV, DstSVOff + DstOff, false, DstAlign);
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} else {
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MVT NVT = VT;
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while (!TLI.isTypeLegal(NVT)) {
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NVT = (MVT::SimpleValueType(NVT.getSimpleVT() + 1));
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}
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Value = DAG.getExtLoad(ISD::EXTLOAD, dl, NVT, Chain,
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getMemBasePlusOffset(Src, SrcOff, DAG),
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SrcSV, SrcSVOff + SrcOff, VT, false, Align);
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Store = DAG.getTruncStore(Chain, dl, Value,
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getMemBasePlusOffset(Dst, DstOff, DAG),
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DstSV, DstSVOff + DstOff, VT, false, DstAlign);
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}
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DstSV, DstSVOff + DstOff, VT, false, DstAlign);
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}
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OutChains.push_back(Store);
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SrcOff += VTSize;
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