https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127422
--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <[email protected]>: https://gcc.gnu.org/g:55e9aef65b2d3705089c2de601867aa6e7cc261d commit r17-4404-g55e9aef65b2d3705089c2de601867aa6e7cc261d Author: Yongqiang Tian <[email protected]> Date: Wed Sep 16 22:17:21 2026 +1000 combine: Ignore debug insns in volatile checks [PR127422] A DEBUG_INSN can retain a volatile MEM after the corresponding ordinary instruction has been deleted. Do not treat that non-executing payload as an intervening volatile access in can_combine_p. Assisted-by: OpenAI Codex 5.6 Sol, co-reviewed by Claude and Yongqiang Tian. PR rtl-optimization/127422 gcc/ChangeLog: * combine.cc (can_combine_p): Ignore debug instructions when scanning for intervening volatile references. gcc/testsuite/ChangeLog: * gcc.dg/pr127422.c: New test. Signed-off-by: Yongqiang Tian <[email protected]>
