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Fix pattern sort in DAGISelEmitter.cpp
The old code skipped one of the sorting criteria if either pattern had no types. This could lead to cycles of the form X < Y, Y < Z, Z < X. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191735 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -81,15 +81,13 @@ struct PatternSortingPredicate {
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const TreePatternNode *LHSSrc = LHS->getSrcPattern();
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const TreePatternNode *RHSSrc = RHS->getSrcPattern();
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if (LHSSrc->getNumTypes() != 0 && RHSSrc->getNumTypes() != 0 &&
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LHSSrc->getType(0) != RHSSrc->getType(0)) {
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MVT::SimpleValueType V1 = LHSSrc->getType(0), V2 = RHSSrc->getType(0);
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if (MVT(V1).isVector() != MVT(V2).isVector())
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return MVT(V2).isVector();
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MVT LHSVT = (LHSSrc->getNumTypes() != 0 ? LHSSrc->getType(0) : MVT::Other);
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MVT RHSVT = (RHSSrc->getNumTypes() != 0 ? RHSSrc->getType(0) : MVT::Other);
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if (LHSVT.isVector() != RHSVT.isVector())
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return RHSVT.isVector();
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if (MVT(V1).isFloatingPoint() != MVT(V2).isFloatingPoint())
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return MVT(V2).isFloatingPoint();
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}
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if (LHSVT.isFloatingPoint() != RHSVT.isFloatingPoint())
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return RHSVT.isFloatingPoint();
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// Otherwise, if the patterns might both match, sort based on complexity,
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// which means that we prefer to match patterns that cover more nodes in the
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