[all-commits] [llvm/llvm-project] 4704da: [ARM] Fix Thumb2 compare being emitted ExpandCMP_SWAP

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4704da1374964c0634d7e17c9f87923666d57396
      https://github.com/llvm/llvm-project/commit/4704da1374964c0634d7e17c9f87923666d57396
  Author: David Green <david.green at arm.com>
  Date:   2022-07-20 (Wed, 20 Jul 2022)

  Changed paths:
    M llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
    M llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp
    M llvm/lib/Target/ARM/ARMInstrThumb.td
    M llvm/test/CodeGen/ARM/atomicrmw_exclusive_monitor_ints.ll
    M llvm/test/CodeGen/ARM/cmpxchg.mir
    A llvm/test/CodeGen/Thumb2/cmpxchg.mir

  Log Message:
  -----------
  [ARM] Fix Thumb2 compare being emitted ExpandCMP_SWAP

Given a patch like D129506, using instructions not valid for the current
target feature set becomes an error. This fixes an issue in
ARMExpandPseudo::ExpandCMP_SWAP where Thumb2 compares were used in
Thumb1Only code, such as thumbv8m.baseline targets.

Differential Revision: https://reviews.llvm.org/D129695