On Wed, Sep 7, 2022 at 10:03 AM Jeff Law via Gcc-patches <gcc-patches@gcc.gnu.org> wrote: > > > > On 9/2/2022 8:36 AM, H.J. Lu via Gcc-patches wrote: > > CONCAT and CONCATN never appear in the insn chain. They are only used > > in debug insn. Ignore debug insns with CONCAT and CONCATN for insn > > scheduling to avoid different insn orders with and without debug insn. > > > > gcc/ > > > > PR rtl-optimization/106746 > > * sched-deps.cc (sched_analyze_2): Ignore debug insns with CONCAT > > and CONCATN. > Shouldn't we be ignoring everything in a debug insn? I don't see why > CONCAT/CONCATN are special here.
Debug insns are processed by insn scheduling. I think it is to improve debug experiences. It is just that there are no matching usages of CONCAT/CONCATN in non-debug insns. -- H.J.
