https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79390
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Try --param=max-rtl-if-conversion-insns=2 .
Or try some -mtune that is not:
/* X86_TUNE_ONE_IF_CONV_INSNS: Restrict a number of set insns to be
if-converted to one. */
DEF_TUNE (X86_TUNE_ONE_IF_CONV_INSN, "one_if_conv_insn",
m_SILVERMONT | m_KNL | m_INTEL | m_CORE_ALL | m_GENERIC)
See PR68920 for more details. cmov is a mixed bag, sometimes it helps (usually
when the jump can't be predicted well), sometimes it slows things down
tremendously.
