[PATCH] arm, testsuite: Add -mtune=cortex-m55 to dlstp-compile-asm-1.c test.

[Christophe Lyon]

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>
-- 
2.34.1