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Fix memcpy expansion so it won't generate invalid 

types for the target (I think).  This was breaking
the PPC32 calling sequence.

llvm-svn: 73900
This commit is contained in:
Dale Johannesen 2009-06-22 20:59:07 +00:00
parent 0b6a6242ed
commit 315fb72d36
1 changed files with 25 additions and 6 deletions
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31
llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -3121,6 +3121,8 @@ bool MeetsMaxMemopRequirement(std::vector<MVT> &MemOps,
VT = (MVT::SimpleValueType)(VT.getSimpleVT() - 1);
VTSize = VT.getSizeInBits() / 8;
} else {
// This can result in a type that is not legal on the target, e.g.
// 1 or 2 bytes on PPC.
VT = (MVT::SimpleValueType)(VT.getSimpleVT() - 1);
VTSize >>= 1;
}
@ -3177,12 +3179,29 @@ static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
getMemBasePlusOffset(Dst, DstOff, DAG),
DstSV, DstSVOff + DstOff, false, DstAlign);
} else {
Value = DAG.getLoad(VT, dl, Chain,
getMemBasePlusOffset(Src, SrcOff, DAG),
SrcSV, SrcSVOff + SrcOff, false, Align);
Store = DAG.getStore(Chain, dl, Value,
getMemBasePlusOffset(Dst, DstOff, DAG),
DstSV, DstSVOff + DstOff, false, DstAlign);
// 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.
// 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,
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);
}
}
OutChains.push_back(Store);
SrcOff += VTSize;