On 06/12/2024 10:02, Christophe Lyon wrote:
> This test would fail if GCC is configured with non-default options,
> such as -mtune=cortex-a9.
>
> This 'unexpected' scheduling makes the DLSTP optimization generate
> subs lr, #16
> bhi .L4
> lctp
> pop {r4, r5, pc}
> .L4:
> sub ip, ip, #16
> b <loop-begin>
>
> instead of the expected
> sub ip, ip, #16
> letp lr, <loop-begin>
>
> Although GCC still optimizes all 144 loops, only 96 use letp, 48
> others use lctp.
>
> The patch simply forces -mtune=cortex-m55 to avoid this unexpected
> issue.
>
> gcc/testsuite/ChangeLog:
>
> * gcc.target/arm/mve/dlstp-compile-asm-1.c: Add -mtune=cortex-m55
> ---
> gcc/testsuite/gcc.target/arm/mve/dlstp-compile-asm-1.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/gcc/testsuite/gcc.target/arm/mve/dlstp-compile-asm-1.c
> b/gcc/testsuite/gcc.target/arm/mve/dlstp-compile-asm-1.c
> index 6e6da3d3d59..7b7f1da6435 100644
> --- a/gcc/testsuite/gcc.target/arm/mve/dlstp-compile-asm-1.c
> +++ b/gcc/testsuite/gcc.target/arm/mve/dlstp-compile-asm-1.c
> @@ -1,6 +1,6 @@
> /* { dg-do compile } */
> /* { dg-require-effective-target arm_v8_1m_mve_ok } */
> -/* { dg-options "-O3 -save-temps" } */
> +/* { dg-options "-O3 -save-temps -mtune=cortex-m55" } */
> /* { dg-add-options arm_v8_1m_mve } */
>
> #include <arm_mve.h>
OK
R.
