i386: Fix GLC tuning with -masm=intel [PR104104]

i386: Fix GLC tuning with -masm=intel [PR104104]

> > On Sat, Jan 15, 2022 at 5:39 PM Hongyu Wang <wwwhhhyyy333@gmail.com> wrote:
> > > Thanks for the suggestion, here is the updated patch that survived
> > > bootstrap/regtest.

Unfortunately the patch results in assembler failures with -masm=intel.

> > > > +  if (TARGET_DEST_FALSE_DEPENDENCY
> > > > +      && get_attr_dest_false_dep (insn) ==
> > > > +        DEST_FALSE_DEP_TRUE)
> > > > +    output_asm_insn ("vxorps\t{%x0, %x0, %x0}", operands);

All the vxorps insns were emitted like the above, which means for -masm=sysv
it looks like
        vxorps  %xmm3, %xmm3, %xmm3
but for -masm=intel like:
        vxorps
We want obviously
        vxorps  xmm3, xmm3, xmm3
so the following patch just drops the errorneous {}s.

2022-01-19  Jakub Jelinek  <jakub@redhat.com>

	PR target/104104
	* config/i386/sse.md
	(<avx512>_<complexopname>_<mode><maskc_name><round_name>,
	avx512fp16_<complexopname>sh_v8hf<mask_scalarc_name><round_scalarcz_name>,
	avx512dq_mul<mode>3<mask_name>, <avx2_avx512>_permvar<mode><mask_name>,
	avx2_perm<mode>_1<mask_name>, avx512f_perm<mode>_1<mask_name>,
	avx512dq_rangep<mode><mask_name><round_saeonly_name>,
	avx512dq_ranges<mode><mask_scalar_name><round_saeonly_scalar_name>,
	<avx512>_getmant<mode><mask_name><round_saeonly_name>,
	avx512f_vgetmant<mode><mask_scalar_name><round_saeonly_scalar_name>):
	Use vxorps\t%x0, %x0, %x0 instead of vxorps\t{%x0, %x0, %x0}.

	* gcc.target/i386/pr104104.c: New test.