[PATCH] D94250: [SystemZ] Introducing assembler dialects for the Z backend

[Anirudh Prasad via Phabricator via llvm-commits]

anirudhp created this revision.
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- This patch introduces a different assembler dialect ("hlasm") for z/OS. The default dialect has now been given the "att" dialect name. For this appropriate changes have been added to SystemZ.td.
- This patch also makes a few changes to SystemZInstrFormats.td which restrict a few condition code mnemonics to just the "att" dialect variant (he, le, lh, nhe, nle, nlh). These extended condition code mnemonics are not available in HLASM.
- A new private function has been introduced in SystemZAsmParser.cpp to return the assembler dialect set in SystemZMCAsmInfo.cpp. The reason we couldn't/haven't explicitly queried the overriden getAssemblerDialect function from AsmParser is outlined in this thread here <https://lists.llvm.org/pipermail/llvm-dev/2020-November/146875.html>. This returned dialect is directly passed onto the relevant matcher functions which taken in a variantID, so that the matcher functions can appropriately choose an instruction based on the variant.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D94250

Files:
  llvm/lib/Target/SystemZ/AsmParser/SystemZAsmParser.cpp
  llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmInfo.cpp
  llvm/lib/Target/SystemZ/SystemZ.td
  llvm/lib/Target/SystemZ/SystemZInstrFormats.td
  llvm/lib/Target/SystemZ/SystemZInstrInfo.td

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