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The problem is that x86 is the only target that defines HAVE_ATTR_length and doesn't schedule any splitting pass at -O0 after pro_and_epilogue. So, either we go back to handling this during vzeroupper output (unconditionally, rather than flag_ipa_ra guarded), or we need to tweak the split* passes for x86. Seems there are 5 split passes, split1 is run unconditionally before reload, split2 is run for optimize > 0 or STACK_REGS (x86) after ra but before epilogue_completed, split3 is run before regstack for STACK_REGS and optimize and -fno-schedule-insns2, split4 is run before sched2 if sched2 is run and split5 is run before shorten_branches if HAVE_ATTR_length and not STACK_REGS. 2020-02-05 Jakub Jelinek <jakub@redhat.com> PR target/92190 * recog.c (pass_split_after_reload::gate): For STACK_REGS targets, don't run when !optimize. (pass_split_before_regstack::gate): For STACK_REGS targets, run even when !optimize.
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