Enable FMA in rsqrt2 expander and fold rsqrtv16sf2 expander into
rsqrt2 expander which expands to UNSPEC_RSQRT28 for TARGET_AVX512ER.
Although it doesn't show performance change in our workloads, FMA can
improve other workloads.
gcc/
PR target/88713
* config/i386/i386-expand.c (ix
Hello HJ,
On 28 июн 07:19, H.J. Lu via Gcc-patches wrote:
> Enable FMA in rsqrt2 expander and fold rsqrtv16sf2 expander into
> rsqrt2 expander which expands to UNSPEC_RSQRT28 for TARGET_AVX512ER.
> Although it doesn't show performance change in our workloads, FMA can
> improve other workloads.
>
On Tue, Jul 7, 2020 at 8:56 AM Kirill Yukhin wrote:
>
> Hello HJ,
>
> On 28 июн 07:19, H.J. Lu via Gcc-patches wrote:
> > Enable FMA in rsqrt2 expander and fold rsqrtv16sf2 expander into
> > rsqrt2 expander which expands to UNSPEC_RSQRT28 for TARGET_AVX512ER.
> > Although it doesn't show performan
On 07 июл 09:06, H.J. Lu wrote:
> On Tue, Jul 7, 2020 at 8:56 AM Kirill Yukhin wrote:
> >
> > Hello HJ,
> >
> > On 28 июн 07:19, H.J. Lu via Gcc-patches wrote:
> > > Enable FMA in rsqrt2 expander and fold rsqrtv16sf2 expander into
> > > rsqrt2 expander which expands to UNSPEC_RSQRT28 for TARGET_AV
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/i386/pr88713-1.c
> @@ -0,0 +1,13 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O2 -Ofast -mno-avx512f -mfma" } */
>
> I gues -O2 is useless here (and in -2.c test).
Fixed.
> Othwerwise LGTM.
>
This is t
