https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118662
--- Comment #17 from rguenther at suse dot de <rguenther at suse dot de> --- > Am 27.01.2025 um 17:38 schrieb ubizjak at gmail dot com > <gcc-bugzi...@gcc.gnu.org>: > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118662 > > --- Comment #15 from Uroš Bizjak <ubizjak at gmail dot com> --- > The testcase now generates (-O2 -ftree-slp-vectorize -fno-vect-cost-model > -msse4): > > addup: > pmovsxbd (%rdi), %xmm0 > movd (%rdi), %xmm1 > movdqa %xmm0, %xmm2 > pextrb $3, %xmm1, %edx > ... > > One possible improvement would be to move QImode value to %xmm1 and > sign-extend > to %xmm0 from %xmm1. Something like: > > addup: > movd (%rdi), %xmm1 > pmovsxbd %xmm1, %xmm0 > movdqa %xmm0, %xmm2 > pextrb $3, %xmm1, %edx > ... > > This would save memory read. IIRC there are a few bugreports that we tend to Duplikate Memory loads into instructions that can handle memory operands. > > -- > You are receiving this mail because: > You are the assignee for the bug. > You are on the CC list for the bug.
