Re: [aarch64] Use dup and zip1 for interleaving elements in initializing vector

[Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>]

On Fri, 12 May 2023 at 00:37, Richard Sandiford
<richard.sandiford@arm.com> wrote:
>
> Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org> writes:
> > diff --git a/gcc/testsuite/gcc.target/aarch64/vec-init-18.c b/gcc/testsuite/gcc.target/aarch64/vec-init-18.c
> > new file mode 100644
> > index 00000000000..598a51f17c6
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.target/aarch64/vec-init-18.c
> > @@ -0,0 +1,20 @@
> > +/* { dg-do compile } */
> > +/* { dg-options "-O3" } */
> > +
> > +#include <arm_neon.h>
> > +
> > +int16x8_t foo(int16_t x, int y)
> > +{
> > +  int16x8_t v = (int16x8_t) {x, y, x, y, x, y, x, y};
> > +  return v;
> > +}
> > +
> > +int16x8_t foo2(int16_t x)
> > +{
> > +  int16x8_t v = (int16x8_t) {x, 1, x, 1, x, 1, x, 1};
> > +  return v;
> > +}
> > +
> > +/* { dg-final { scan-assembler-times {\tdup\tv[0-9]+\.4h, w[0-9]+} 3 } } */
> > +/* { dg-final { scan-assembler {\tmovi\tv[0-9]+\.4h, 0x1} } } */
> > +/* { dg-final { scan-assembler {\tzip1\tv[0-9]+\.8h, v[0-9]+\.8h, v[0-9]+\.8h} } } */
>
> Would be good to make this a scan-assembler-times ... 2.
>
> OK with that change.  Thanks for doing this.
Thanks, committed the patch in:
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=8b18714fbb1ca9812b33b3de75fe6ba4a57d4946
after bootstrap+test on aarch64-linux-gnu, and verifying bootstrap
passes on aarch64-linux-gnu with --enable-checking=all.

Thanks,
Prathamesh
>
> Richard