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Soften the pattern-can-never-match error in TableGen into a warning. This pattern can be very useful in cases where you want to define a multiclass that covers both commutative and non-commutative operators (say, add and sub).
llvm-svn: 164256
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@ -2800,8 +2800,11 @@ void CodeGenDAGPatterns::AddPatternToMatch(const TreePattern *Pattern,
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const PatternToMatch &PTM) {
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// Do some sanity checking on the pattern we're about to match.
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std::string Reason;
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if (!PTM.getSrcPattern()->canPatternMatch(Reason, *this))
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Pattern->error("Pattern can never match: " + Reason);
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if (!PTM.getSrcPattern()->canPatternMatch(Reason, *this)) {
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PrintWarning(Pattern->getRecord()->getLoc(),
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Twine("Pattern can never match: ") + Reason);
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return;
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}
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// If the source pattern's root is a complex pattern, that complex pattern
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// must specify the nodes it can potentially match.
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