[Bug target/104978] [avx512fp16] wrong code for _mm_mask_fcmadd_round_sch

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104978

--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #0)
> #include<immintrin.h>
> __m128h
> foo (__m128h a, __m128h b, __m128h c, __mmask8 m)
> { 
>     return _mm_mask_fcmadd_round_sch (a, m, b, c, 8);
> }
> 
> 
> _Z3fooDv8_DF16_S_S_h:
>         kmovd   k1, edi
>         vfcmaddcsh      xmm2{k1}, xmm0, xmm1, {rn-sae}
>         vmovaps xmm0{k1}, xmm2
>         ret
> 
> k1 must & 1 before vmovaps xmm0{k1}, xmm2.

Or just vmovaps xmm0, xmm2 since vfcmaddcsh will copy upper [32:128] from
src1(xmm0) here.