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Fortify r152675 a bit. Although I'm not able to come up with a test case that would trigger the truncation case.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152678 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -7204,7 +7204,7 @@ SDValue DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) {
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// If the result of load has to be truncated, then it's not necessarily
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// profitable.
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if (NVT.bitsLT(LVT))
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if (NVT.bitsLT(LVT) && !TLI.isTruncateFree(LVT, NVT))
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return SDValue();
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if (InVec.getOpcode() == ISD::BITCAST) {
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@ -7308,6 +7308,7 @@ SDValue DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) {
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// use of the load; that's okay because we don't want to perform this
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// transformation in other cases anyway.
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SDValue Load;
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SDValue Chain;
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if (NVT.bitsGT(LVT)) {
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// If the result type of vextract is wider than the load, then issue an
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// extending load instead.
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@ -7316,14 +7317,21 @@ SDValue DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) {
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Load = DAG.getExtLoad(ExtType, N->getDebugLoc(), NVT, LN0->getChain(),
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NewPtr, LN0->getPointerInfo().getWithOffset(PtrOff),
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LVT, LN0->isVolatile(), LN0->isNonTemporal(),Align);
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} else
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Chain = Load.getValue(1);
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} else {
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Load = DAG.getLoad(LVT, N->getDebugLoc(), LN0->getChain(), NewPtr,
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LN0->getPointerInfo().getWithOffset(PtrOff),
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LN0->isVolatile(), LN0->isNonTemporal(),
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LN0->isInvariant(), Align);
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Chain = Load.getValue(1);
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if (NVT.bitsLT(LVT))
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Load = DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), NVT, Load);
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else
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Load = DAG.getNode(ISD::BITCAST, N->getDebugLoc(), NVT, Load);
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}
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WorkListRemover DeadNodes(*this);
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SDValue From[] = { SDValue(N, 0), SDValue(LN0,1) };
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SDValue To[] = { Load.getValue(0), Load.getValue(1) };
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SDValue To[] = { Load, Chain };
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DAG.ReplaceAllUsesOfValuesWith(From, To, 2, &DeadNodes);
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// Since we're explcitly calling ReplaceAllUses, add the new node to the
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// worklist explicitly as well.
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