i386: Remove V1DImode shift expanders [PR98287]

i386: Remove V1DImode shift expanders [PR98287]

On Tue, Feb 02, 2021 at 02:23:55PM +0100, Richard Biener wrote:
> All I say is that the x86 target
> should either not advertise V1DF shifts or advertise the basic
> ops that reasonable simplification would expect to exist.

The backend has several V1?Imode shifts, but optab only for those V1DImode
ones:

grep '[la]sh[lr]v1[qhsdtox]' tmp-mddump.md
(define_insn ("mmx_ashlv1di3")
(define_insn ("mmx_lshrv1di3")
(define_insn ("avx512bw_ashlv1ti3")
(define_insn ("avx512bw_lshrv1ti3")
(define_insn ("sse2_ashlv1ti3")
(define_insn ("sse2_lshrv1ti3")
(define_expand ("ashlv1di3")
(define_expand ("lshrv1di3")
  emit_insn (gen_sse2_lshrv1ti3 (tmp, gen_lowpart (V1TImode, operands[1]),

I think it has been introduced with
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89021#c13

Before we didn't have any V1DImode expanders (except mov/movmisalign, but
those are needed and are supplied for other V1??mode modes too).

This patch just removes the two V1DImode shift expanders with standard names.

2021-02-03  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/98287
	* config/i386/mmx.md (<insn><mode>3): For shifts don't enable expander
	for V1DImode.

	* gcc.dg/pr98287.c: New test.