[Bug target/80819] [6/7/8 regression] Useless store to the stack in _mm_set_epi64x with SSE4 -mno-avx

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80819

--- Comment #8 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #7)
> Note it is already postreload that propagates the %rsi register directly
> into vec_concatv2di.  And the reason why DSE does nothing is that since LRA
> introduction the DSE spill removal has been disabled and last year even
> removed altogether.
> Removing the * from the first alternative fixes this.
> Uros, what is the purpose of those two *s and can't they be replaced by say
> ^ or $ ?

The (*x,0,rm) alternative was introduced together with Yr to avoid REX
prefixes, but the reason for *rm escaped my mind... probably is there from the
reload times, and could hopefully be removed.