[gcc r15-8648] arm: testsuite: memcpy-aligned requires unaligned accesses

[Richard Earnshaw]

https://gcc.gnu.org/g:b1ac0c5f1986d0774cfc980da8323f17747a1ce9

commit r15-8648-gb1ac0c5f1986d0774cfc980da8323f17747a1ce9
Author: Richard Earnshaw <rearnsha@arm.com>
Date:   Fri Mar 21 15:15:21 2025 +0000

    arm: testsuite: memcpy-aligned requires unaligned accesses
    
    This test is designed to check that if one of the operands is
    aligned (but the other isn't) we expand to a sensible sequence and
    bypass most of the overhead of doing a memcpy.  But on targets without
    unaligned accessess, we still end up calling memcpy.  It's then a
    lottery as to whether the prologue and epilogue code, plus the
    set-up for the memcpy itself, generate instructions that match the
    scan patterns.
    
    Since in those cases we're not actually testing what the test is looking
    for anyway, just skip the test on strict-alignment targets.
    
    gcc/testsuite:
            * gcc.target/arm/memcpy-aligned-1.c: Require unaligned accesses.

Diff:
---
 gcc/testsuite/gcc.target/arm/memcpy-aligned-1.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/testsuite/gcc.target/arm/memcpy-aligned-1.c b/gcc/testsuite/gcc.target/arm/memcpy-aligned-1.c
index 852b391388bd..42e2a6bbdf74 100644
--- a/gcc/testsuite/gcc.target/arm/memcpy-aligned-1.c
+++ b/gcc/testsuite/gcc.target/arm/memcpy-aligned-1.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_unaligned } */
 /* { dg-options "-O2 -save-temps" } */
 
 void *memcpy (void *dest, const void *src, unsigned int n);