On Sun, Jan 9, 2022 at 10:16 PM HAO CHEN GUI <guih...@linux.ibm.com> wrote:
>
> Hi,
>
> Gentle ping this:
> https://gcc.gnu.org/pipermail/gcc-patches/2021-December/587051.html
>
> Thanks
>
> On 17/12/2021 上午 9:55, HAO CHEN GUI wrote:
> > Hi,
> > This patch defines a new split pattern for TI to V1TI move. The pattern
> > concatenates two subreg:DI of
> > a TI to a V2DI. With the pattern, the subreg pass can do register split for
> > TI when there is a TI to V1TI
> > move. The patch optimizes one unnecessary "mr" out on P9. The new test case
> > illustrates it.
> >
> > Bootstrapped and tested on powerpc64-linux BE and LE with no
> > regressions. Is this okay for trunk?
> > Any recommendations? Thanks a lot.
> >
> > ChangeLog
> > 2021-12-13 Haochen Gui <guih...@linux.ibm.com>
> >
> > gcc/
> > * config/rs6000/vsx.md (split pattern for TI to V1TI move): Defined.
> >
> > gcc/testsuite/
> > * gcc.target/powerpc/pr103124.c: New testcase.
> >
> >
> > patch.diff
> > diff --git a/gcc/config/rs6000/vsx.md b/gcc/config/rs6000/vsx.md
> > index bf033e31c1c..52968eb4609 100644
> > --- a/gcc/config/rs6000/vsx.md
> > +++ b/gcc/config/rs6000/vsx.md
> > @@ -6589,3 +6589,19 @@ (define_insn "xxeval"
> > [(set_attr "type" "vecperm")
> > (set_attr "prefixed" "yes")])
> >
> > +;; Construct V1TI by vsx_concat_v2di
> > +(define_split
> > + [(set (match_operand:V1TI 0 "vsx_register_operand")
> > + (subreg:V1TI
> > + (match_operand:TI 1 "int_reg_operand") 0 ))]
> > + "TARGET_P9_VECTOR && !reload_completed"
> > + [(const_int 0)]
> > +{
> > + rtx tmp1 = simplify_gen_subreg (DImode, operands[1], TImode, 0);
> > + rtx tmp2 = simplify_gen_subreg (DImode, operands[1], TImode, 8);
> > + rtx tmp3 = gen_reg_rtx (V2DImode);
> > + emit_insn (gen_vsx_concat_v2di (tmp3, tmp1, tmp2));
> > + rtx tmp4 = simplify_gen_subreg (V1TImode, tmp3, V2DImode, 0);
> > + emit_move_insn (operands[0], tmp4);
> > + DONE;
> > +})
> > diff --git a/gcc/testsuite/gcc.target/powerpc/pr103124.c
> > b/gcc/testsuite/gcc.target/powerpc/pr103124.c
> > new file mode 100644
> > index 00000000000..e9072d19b8e
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.target/powerpc/pr103124.c
> > @@ -0,0 +1,12 @@
> > +/* { dg-do compile } */
> > +/* { dg-require-effective-target powerpc_p9vector_ok } */
> > +/* { dg-require-effective-target int128 } */
> > +/* { dg-options "-O2 -mdejagnu-cpu=power9" } */
> > +/* { dg-final { scan-assembler-not "\mmr\M" } } */
Segher probably would prefer {\mmr\M} .
> > +
> > +vector __int128 add (long long a)
> > +{
> > + vector __int128 b;
> > + b = (vector __int128) {a};
> > + return b;
> > +}
This is okay.
Thanks, David
