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/* Test to verify that overlapping memcpy with const sizes that are powers
of two are folded into into the same code as memmove, but that they
are diagnosed nonetheless. Whether a call is folded depends on
the size of the copy, the alignment, and wheteber else the target
might decide to consider. The test is only run on a small subset
of targets where it's known to pass (see PR testsuite/83483).
{ dg-do compile }
{ dg-options "-O0 -Wrestrict -fdump-tree-optimized" }
{ dg-skip-if "skip non-x86 targets" { ! { i?86-*-* x86_64-*-* } } } */
char a[32];
void fold_copy_2 (void)
{
__builtin_memcpy (a + 1, a, 2); /* { dg-warning "\\\[-Wrestrict]" } */
}
void fold_copy_4 (void)
{
__builtin_memcpy (a + 2, a, 4); /* { dg-warning "\\\[-Wrestrict]" } */
}
void fold_copy_8 (void)
{
__builtin_memcpy (a + 3, a, 8); /* { dg-warning "\\\[-Wrestrict]" } */
}
void fold_move_2 (void)
{
__builtin_memmove (a + 1, a, 2);
}
void fold_move_4 (void)
{
__builtin_memmove (a + 2, a, 4);
}
void fold_move_8 (void)
{
__builtin_memmove (a + 3, a, 8);
}
/* { dg-final { scan-tree-dump-not "memcpy" "optimized" } }
{ dg-final { scan-tree-dump-not "memmove" "optimized" } } */
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