[all-commits] [llvm/llvm-project] ee737a: [ARM] Accept .w suffixes for some memory instructions

[Jirui-Wu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ee737ad30fa22256e609279184214f75441acefd
      https://github.com/llvm/llvm-project/commit/ee737ad30fa22256e609279184214f75441acefd
  Author: Jirui Wu <jirui.wu at arm.com>
  Date:   2023-02-24 (Fri, 24 Feb 2023)

  Changed paths:
    M llvm/lib/Target/ARM/ARMInstrThumb2.td
    M llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
    M llvm/test/MC/ARM/basic-thumb2-instructions.s

  Log Message:
  -----------
  [ARM] Accept .w suffixes for some memory instructions

Some memory instructions in the following sections of Armv7-M ARM allow
the .w mnemonic suffix, even though the preferred disassembly is without
the suffix.

A7.7.46 LDRB (immediate) T3
A7.7.55 LDRH (immediate) T3
A7.7.59 LDRSB (immediate) T2
A7.7.63 LDRSH (immediate) T2
A7.7.163 STRB (immediate) T3
A7.7.170 STRH (immediate) T3

This patch accepts the .w suffixes for theses instructions.
Pseudo-instructions and custom parsing logic are used instead of simple
aliases. More discussions are in these relevant patches:
https://reviews.llvm.org/D68916
https://reviews.llvm.org/D96632

Differential Revision: https://reviews.llvm.org/D142980