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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).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164256 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2012-09-19 22:15:06 +00:00
parent cdac1be34a
commit eb79b545fc
1 changed files with 5 additions and 2 deletions
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7
utils/TableGen/CodeGenDAGPatterns.cpp
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@ -2800,8 +2800,11 @@ void CodeGenDAGPatterns::AddPatternToMatch(const TreePattern *Pattern,
const PatternToMatch &PTM) {
// Do some sanity checking on the pattern we're about to match.
std::string Reason;
if (!PTM.getSrcPattern()->canPatternMatch(Reason, *this))
Pattern->error("Pattern can never match: " + Reason);
if (!PTM.getSrcPattern()->canPatternMatch(Reason, *this)) {
PrintWarning(Pattern->getRecord()->getLoc(),
Twine("Pattern can never match: ") + Reason);
return;
}
// If the source pattern's root is a complex pattern, that complex pattern
// must specify the nodes it can potentially match.