https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94042
--- Comment #31 from Vladimir Makarov <vmakarov at gcc dot gnu.org> --- (In reply to Segher Boessenkool from comment #30) > r10-6919 isn't good for Power, btw. Why would it *ever* be a good idea? This heuristic avoid creating small gaps in hard reg file which prevent assignments for multi-reg pseudos. It decreases average SPEC2000 code size and improves performance at least for Intel i7-9700K (0.5% for SPECINT2000 and about 1% for SPECFP2000). It also solves some recent arm testsuite failures (expected use of callee-clobbered hard regs for multi-regs pseudos). I understand the frustration. Sorry for creating it. Unfortunately in RA heuristic patches there is no a perfect solution. Somebody will always be upset.
