On Fri, May 26, 2023 at 4:12 AM Jiang, Haochen wrote:
>
> > gcc/ChangeLog:
> >
> > * config/i386/i386-expand.cc (ix86_expand_vecop_qihi2):
> > Rewrite to expand to 2x-wider (e.g. V16QI -> V16HImode)
> > instructions when available. Emulate truncation via
> > ix86_expand_vec_perm_c
> gcc/ChangeLog:
>
> * config/i386/i386-expand.cc (ix86_expand_vecop_qihi2):
> Rewrite to expand to 2x-wider (e.g. V16QI -> V16HImode)
> instructions when available. Emulate truncation via
> ix86_expand_vec_perm_const_1 when native truncate insn
> is not available.
> (ix86
Rewrite ix86_expand_vecop_qihi2 to expand fo 2x-wider (e.g. V16QI -> V16HImode)
instructions when available. Currently, the compiler generates following
assembly for V16QImode multiplication (-mavx2):
vpunpcklbw %xmm0, %xmm0, %xmm3
vpunpcklbw %xmm1, %xmm1, %xmm2
vpunpckhbw
