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;
> +}
