[PATCH] D88772: [X86] Temporarily set Mode32Bit when matching an instruction with the data32 prefix

[Fangrui Song via Phabricator via llvm-commits]

MaskRay created this revision.
MaskRay added reviewers: craig.topper, RKSimon, spatel.
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PR47632

This allows MC to match `data32 ljmp` as ljmpl.

The compatibility with GNU as improves: `data32 lgdt` will be matched as `lgdtl` (prefixes: 0x67 0x66, instead of 0x66 0x67).

GNU as supports many other `data32 *l`, which we currently hard code.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D88772

Files:
  llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
  llvm/test/MC/X86/data-prefix-fail.s
  llvm/test/MC/X86/x86-16.s

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