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...hange AsmMatcherEmitter 'Hack' variable setting to allow the repeated operand $rd in the AsmString. Do you or anyone else know the history with this 'Hack' flag? Thanks, Ana. diff --git a/utils/TableGen/AsmMatcherEmitter.cpp b/utils/TableGen/AsmMatcherEmitter.cpp index 1a820a5..252fd51 100644 --- a/utils/TableGen/AsmMatcherEmitter.cpp +++ b/utils/TableGen/AsmMatcherEmitter.cpp @@ -1526,7 +1526,7 @@ void AsmMatcherInfo::buildInfo() { II->initialize(*this, SingletonRegisters, Variant, HasMnemonicFirst); // Validate the alias definitions. - II->validate(...

Hi, On Instructions you can use checkEarlyTargetMatchPredicate() to check that the operands are the same. There's an example of that in MipsAsmParser.cpp for DATI and DAHI. I can't think of a reason TableGen couldn't be made to allow this for InstAlias too. > On 15 Dec 2017, at 02:12, via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > Hello, > > InstAlias

Hello, InstAlias does not allow tied operands (repeated operands) in the asm string to be matched. It seems this situation is explicitly prevented in AsmMatcherEmitter.cpp: if (!Hack) PrintFatalError(TheDef->getLoc(), "ERROR: matchable with tied operand '" + Tok + "' can never be matched!");