https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121571
--- Comment #12 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:673f17a48cbbc4f7f9881cb35b43e9b96994efae commit r15-10844-g673f17a48cbbc4f7f9881cb35b43e9b96994efae Author: Vladimir N. Makarov <[email protected]> Date: Wed Jan 28 10:52:21 2026 -0500 [PR121571, LRA]: Reprocess asm insn with different preferences when there are no enough regs for the asm-insn The test for the PR contains asm insn requiring 7 general regs but three operands can be in memory too ('g' constraint). There are only 6 available general regs. IRA in the test case assigns a mask reg to one pseudo. When LRA reloads the pseudo assigned to mask reg, it frees general reg assigned to another pseudo in the asm and assigns mask reg to another pseudo. After a few iterations, we have asm all operands of which are reload pseudos assigned to general regs and one pseudo assigned to mask reg. After that LRA can do nothing and reports "not enough regs". The patch recognizes situation when there are not enough regs for an asm insn and makes 2nd attempt to find reloads when memory for operands with 'g' or 'rm' constraint is preferred. gcc/ChangeLog: PR target/121571 * lra-constraints.cc (process_alt_operands): Reprocess asm insn when there are no enough regs for the asm-insn. gcc/testsuite/ChangeLog: PR target/121571 * gcc.target/i386/pr121571.c: New.
