https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91154
--- Comment #24 from Uroš Bizjak <ubizjak at gmail dot com> --- It looks that the patch introduced a (small?) runtime regression of 5% in SPEC2000 300.twolf on haswell [1]. Maybe worth looking at. [1] https://gcc.opensuse.org/gcc-old/SPEC/CINT/sb-czerny-head-64/300_twolf_recent_big.png