On Mon, 11 May 2020, Uros Bizjak wrote:
> Attached patch implements V2SFmode FMA insn patterns. Patched compiler
> vectorizes FMA, FMS and FNMA instructions, but for some reason fails
> to vectorize FNMS.
>
> I have double checked that the insn pattern is correct, and now I'm
> all out of ideas what could be wrong with the pattern, still ignored
> by the vectorizer. -fno-vect-cost-model does not help so it's time to
> ask the experts...
Do you have negate patterns for V2SFmode? The vectorizer sees
decomposed ops and only the vectorized operations are later formed
into FMAs.
Richard.
> gcc/ChangeLog:
>
> 2020-05-11 Uroš Bizjak <ubiz...@gmail.com>
>
> PR target/95046
> * config/i386/mmx.md (fmav2sf4): New insn pattern.
> (fmsv2sf4): Ditto.
> (fnmav2sf4): Ditto.
> (fnmsv2sf4): Ditto.
>
> testsuite/ChangeLog:
>
> 2020-05-11 Uroš Bizjak <ubiz...@gmail.com>
>
> PR target/95046
> * gcc.target/i386/pr95046-2.c: New test.
>
> Otherwise, the patch is bootstrapped and regression tested on
> x86_64-linux-gnu {,-m32}.
>
> Uros.
>
--
Richard Biener <rguent...@suse.de>
SUSE Software Solutions Germany GmbH, Maxfeldstrasse 5, 90409 Nuernberg,
Germany; GF: Felix Imendörffer; HRB 36809 (AG Nuernberg)
