[PATCH] D84709: [X86] Add support for {disp32} to control size of jmp and jcc instructions in the assembler

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel, echristo.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

By default we pick a 1 byte displacement and let relaxation enlarge it if necessary. The GNU assembler supports a pseudo prefix to basically pre-relax the instruction the larger size.

I plan to add {disp8} and {disp32} support for memory operands in another patch which is why I've included the parsing code and enum for {disp8} pseudo prefix as well.


https://reviews.llvm.org/D84709

Files:
  llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
  llvm/test/MC/X86/x86-16.s
  llvm/test/MC/X86/x86-32.s

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