[PATCH] New test for PR rtl-optimization/96298.

Segher Boessenkool segher@kernel.crashing.org
Sun Aug 16 01:30:21 GMT 2020


On Tue, Jul 28, 2020 at 10:13:31PM +0100, Roger Sayle wrote:
[ You attached something binary, which makes it hard to reply to. ]

> --- /dev/null
> +++ b/gcc/testsuite/gcc.dg/pr96298.c
> @@ -0,0 +1,19 @@
> +/* PR rtl-optimization/96298 */
> +/* { dg-do run } */
> +/* { dg-options "-O2 -fno-tree-forwprop" } */
> +/* { dg-additional-options "-mno-sse" { target x86_64-*-* i?86-*-* } } */

I would do a test with these target flags in gcc.target/i386/, and one
without any in gcc.dg?

It looks fine to me either way, I think you can use vector_size like
this on any target.


Segher


> +typedef unsigned char __attribute__ ((__vector_size__ (8))) v64u8;
> +
> +v64u8 a;
> +
> +int
> +main (void)
> +{
> +  v64u8 x = (a - 1) ^ -a;
> +  for (unsigned i = 0; i < sizeof (x); i++)
> +    if (x[i] != 0xff)
> +      __builtin_abort ();
> +  return 0;
> +}


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