[all-commits] [llvm/llvm-project] 5aa15a: [ARM] - Fix Thumb1InstrInfo::copyPhysReg crash on ...

[Pawan Nirpal via All-commits]

  Branch: refs/heads/release/23.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 5aa15abead01fef21fee4706aa01f39e8ac18829
      https://github.com/llvm/llvm-project/commit/5aa15abead01fef21fee4706aa01f39e8ac18829
  Author: Pawan Nirpal <pnirpal at qti.qualcomm.com>
  Date:   2026-07-16 (Thu, 16 Jul 2026)

  Changed paths:
    M llvm/lib/Target/ARM/Thumb1InstrInfo.cpp
    A llvm/test/CodeGen/ARM/thumb1-copy-physreg-dbg-value-crash.ll

  Log Message:
  -----------
  [ARM] - Fix Thumb1InstrInfo::copyPhysReg crash on debug instructions during liveness walk. (#209478)

clang asserts when compiling with -mthumb -mcpu=arm926ej-s -O0 -g
(pre-v6 Thumb1, debug info enabled). The crash occurs in
LiveRegUnits::stepBackward which unconditionally asserts that it must
never be called on a debug instruction, but Thumb1InstrInfo::copyPhysReg
walks the basic block backward without skipping DBG_VALUE instructions.

Fixes: https://github.com/llvm/llvm-project/issues/209475
(cherry picked from commit 73615e792dc3116d5c66cb8175039dd6d4840f31)



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