https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123121
--- Comment #13 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-15 branch has been updated by Vladimir Makarov <[email protected]>: https://gcc.gnu.org/g:ac40092e0010873e5c8a12ef051a406924bebbdf commit r15-10680-gac40092e0010873e5c8a12ef051a406924bebbdf Author: Vladimir N. Makarov <[email protected]> Date: Fri Jan 9 10:36:29 2026 -0500 [PR123121, LRA]: Fix wrong rematerialization of insns with several outputs LRA in the test case, rematerialize insn with div/mod where div result is not used. Still div result requires ax which is used by different pseudos at point of rematerialization and this clobbers the pseudo value. The patch solves the problem by constraining to single set insns as we always rematerialize only one pseudo value. Also there is no sense to rematerialize div/mod as usually their latency is more than load value from CPU cache. The patch explicitly excludes such insns from rematerialization. gcc/ChangeLog: PR rtl-optimization/123121 * lra-remat.cc (bad_for_rematerialization_p): Consider div/mod ops. (operand_to_remat): Exclude rematerialization of insns with multiple sets. gcc/testsuite/ChangeLog: PR rtl-optimization/123121 * gcc.target/i386/pr123121.c: New.
