diff options
| -rw-r--r-- | utils/TableGen/AsmMatcherEmitter.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/utils/TableGen/AsmMatcherEmitter.cpp b/utils/TableGen/AsmMatcherEmitter.cpp index 097cbfc680..9e8e9462cc 100644 --- a/utils/TableGen/AsmMatcherEmitter.cpp +++ b/utils/TableGen/AsmMatcherEmitter.cpp @@ -488,6 +488,15 @@ struct MatchableInfo { return false; } + // Give matches that require more features higher precedence. This is useful + // because we cannot define AssemblerPredicates with the negation of + // processor features. For example, ARM v6 "nop" may be either a HINT or + // MOV. With v6, we want to match HINT. The assembler has no way to + // predicate MOV under "NoV6", but HINT will always match first because it + // requires V6 while MOV does not. + if (RequiredFeatures.size() != RHS.RequiredFeatures.size()) + return RequiredFeatures.size() > RHS.RequiredFeatures.size(); + return false; } |