https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88464
--- Comment #21 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Jakub Jelinek from comment #20) > (In reply to Uroš Bizjak from comment #19) > > FYI, there are quite some sequences like: > > > > kmovw %k1, %r11d > > testb %r11b, %r11b > > jne .L63 > > > > (e.g. when compiling avx512f-pr88464-1.c). > > > > Perhaps ktest insn can be utilized here? > > It can if -mavx512dq, because we need ktestb rather than ktestw. Or we > could do kandw first, but that would be longer (movl $255, %r11d; kmovw > $r11d, %k2; kandw %k1, %k2; ktestw %k2, %k2). Have you tried with > -mavx512dq? I haven't added it to dg-options of the tests, because I wanted > to test the behavior without it too and duplicating all the tests also for > -mavx512dq would be too much. Indeed, -mavx512dq produces expected ktestb. Sorry for the false alarm.