On Tue, Nov 17, 2020 at 12:24 PM Richard Sandiford via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> We're now able to vectorise the set-up loop:
>
> int p = power2 (fns[i].po2);
> for (int j = 0; j < N; j++)
> a[j] = ((p << 4) * j) / (N - 1) - (p << 5);
>
> Rather than adjust the expected output for that, it seemed better
> to disable optimisation for the testing code.
>
> Tested on aarch64-linux-gnu (with and without SVE), arm-linux-gnueabihf
> and x86_64-linux-gnu. OK to install?
In other places we just add a asm ("" : : : "memory") to the loop body, can you
do it like htat?
Thanks,
RIchard.
> Richard
>
>
> gcc/testsuite/
> * gcc.dg/vect/vect-sdiv-pow2-1.c (main): Disable optimization.
> ---
> gcc/testsuite/gcc.dg/vect/vect-sdiv-pow2-1.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/gcc/testsuite/gcc.dg/vect/vect-sdiv-pow2-1.c
> b/gcc/testsuite/gcc.dg/vect/vect-sdiv-pow2-1.c
> index be70bc6c47e..bf387133d01 100644
> --- a/gcc/testsuite/gcc.dg/vect/vect-sdiv-pow2-1.c
> +++ b/gcc/testsuite/gcc.dg/vect/vect-sdiv-pow2-1.c
> @@ -53,7 +53,7 @@ power2 (int x)
>
> #define N 50
>
> -int
> +int __attribute__ ((optimize (0)))
> main (void)
> {
> int a[N], b[N], c[N];
