On 9/21/22 16:11, H.J. Lu wrote:
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.
But from a dependency standpoint ISTM all debug insn can be ignored. I
still don't see why concat/concatn should be special here.
jeff
