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[TableGen] Don't try to move CheckOpcode before CheckType/CheckChildType in ContractNodes. NFC

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It appears that CheckOpcode is already emitted before CheckType so
this hasn't been doing anything on any in tree targets.
This commit is contained in:
Craig Topper 2025-02-04 21:16:04 -08:00
parent 79762a10e4
commit 31bd82cdcc
1 changed files with 5 additions and 7 deletions
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12
llvm/utils/TableGen/DAGISelMatcherOpt.cpp
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@ -135,13 +135,11 @@ static void ContractNodes(std::unique_ptr<Matcher> &MatcherPtr,
// variants.
}
// If we have a CheckType/CheckChildType/Record node followed by a
// CheckOpcode, invert the two nodes. We prefer to do structural checks
// before type checks, as this opens opportunities for factoring on targets
// like X86 where many operations are valid on multiple types.
if ((isa<CheckTypeMatcher>(N) || isa<CheckChildTypeMatcher>(N) ||
isa<RecordMatcher>(N)) &&
isa<CheckOpcodeMatcher>(N->getNext())) {
// If we have a Record node followed by a CheckOpcode, invert the two nodes.
// We prefer to do structural checks before type checks, as this opens
// opportunities for factoring on targets like X86 where many operations are
// valid on multiple types.
if (isa<RecordMatcher>(N) && isa<CheckOpcodeMatcher>(N->getNext())) {
// Unlink the two nodes from the list.
Matcher *CheckType = MatcherPtr.release();
Matcher *CheckOpcode = CheckType->takeNext();