https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119270
--- Comment #1 from Haochen Jiang <haochen.jiang at intel dot com> --- >From my bisect, it might caused by r15-7932 on single copy for Ice Lake. Guilty Commit: e355fe414aa3aaf215c7dd9dd789ce217a1b458c Author: Vladimir N. Makarov Date: 2025-03-11 04:27:51 Tuesday Diff: -2.45499181669395% Message: [PR114991][IRA]: Improve reg equiv invariant calculation In PR test case IRA preferred to allocate hard reg to a pseudo instead of its equivalence. This resulted in allocating caller-saved hard reg and generating save/restore insns in the function prologue/epilogue. The equivalence is an invariant (stack pointer plus offset) and the pseudo is used mostly as memory address. This happened as there was no simplification of insn after the invariant substitution. The patch adds the necessary code.
