https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122215
--- Comment #18 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:8bc11df218b3b9af0002188a6dfdf81e751ea278 commit r15-10597-g8bc11df218b3b9af0002188a6dfdf81e751ea278 Author: Vladimir N. Makarov <[email protected]> Date: Fri Dec 5 14:21:38 2025 -0500 [PR122215, IRA]: Fix undefined behaviour of improve_allocation Register filters are used in one loop of improve_allocation to ignore some hard regs for cost calculation but it is missed in the subsequent loop using the costs. This results in usage of random (undefined) register costs and in sporadic code generation for riscv32 which uses the filters. gcc/ChangeLog: PR rtl-optimization/122215 * ira-color.cc (improve_allocation): Use register filter for all loop on hard regs. gcc/testsuite/ChangeLog: PR rtl-optimization/122215 * gcc.target/riscv/pr122215.c: New. * lib/target-supports.exp (check_effective_target_valgrind): New.
