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Unlike other targets, ARM now uses BUILD_VECTORs post-legalization so they
can't be changed arbitrarily by the DAGCombiner without checking if it is running after legalization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107097 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2322,7 +2322,8 @@ SDValue DAGCombiner::visitOR(SDNode *N) {
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}
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// fold (or x, undef) -> -1
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if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF) {
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if (!LegalOperations &&
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(N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)) {
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EVT EltVT = VT.isVector() ? VT.getVectorElementType() : VT;
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return DAG.getConstant(APInt::getAllOnesValue(EltVT.getSizeInBits()), VT);
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}
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10
test/CodeGen/ARM/2010-06-28-DAGCombineUndef.ll
Normal file
10
test/CodeGen/ARM/2010-06-28-DAGCombineUndef.ll
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@ -0,0 +1,10 @@
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; RUN: llc < %s -march=arm -mattr=+neon
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define void @main() nounwind {
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entry:
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store <2 x i64> undef, <2 x i64>* undef, align 16
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%0 = load <16 x i8>* undef, align 16 ; <<16 x i8>> [#uses=1]
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%1 = or <16 x i8> zeroinitializer, %0 ; <<16 x i8>> [#uses=1]
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store <16 x i8> %1, <16 x i8>* undef, align 16
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ret void
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}
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