https://gcc.gnu.org/g:84e61c03c97908ea03409beeaa27f2f1736f1102
commit r14-12903-g84e61c03c97908ea03409beeaa27f2f1736f1102 Author: Alexey Lapshin <[email protected]> Date: Mon Sep 28 23:59:53 2026 +0700 xtensa: Don't index reg_renumber before LRA in xt_true_regnum xt_true_regnum is used by move expanders and insn conditions, which IRA invokes through emit_move_insn and recog_memoized when emitting moves for regional allocation. At that point reg_renumber has not been resized to cover the new pseudos, so indexing it reads out of bounds. Before LRA starts reg_renumber holds no final assignments, so only consult it once LRA is in progress or reload has completed. gcc/ChangeLog: PR target/107549 * config/xtensa/xtensa.cc (xt_true_regnum): Don't index reg_renumber before LRA starts. (cherry picked from commit cd15f0e559442c9b387d3cb7c6ce07d7109b825e) Diff: --- gcc/config/xtensa/xtensa.cc | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/gcc/config/xtensa/xtensa.cc b/gcc/config/xtensa/xtensa.cc index 9beac9324679..c9860728f7e6 100644 --- a/gcc/config/xtensa/xtensa.cc +++ b/gcc/config/xtensa/xtensa.cc @@ -488,9 +488,12 @@ xt_true_regnum (rtx x) { if (REG_P (x)) { + /* Before LRA, reg_renumber need not cover pseudos created since it + was last resized (e.g. by ira_emit during regional allocation). */ if (! HARD_REGISTER_P (x) && reg_renumber - && (lra_in_progress || reg_renumber[REGNO (x)] >= 0)) + && (lra_in_progress + || (reload_completed && reg_renumber[REGNO (x)] >= 0))) return reg_renumber[REGNO (x)]; return REGNO (x); }
