Viewing file:  memcmp-6.c (1.06 KB) -rw-r--r--
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/* PR tree-optimization/96670 - ICE on memchr with an empty initializer
{ dg-do compile }
{ dg-options "-O -Wall -fdump-tree-optimized" } */
struct {
int i, j;
} const s = { };
const char a[sizeof s] = { };
void memcmp_success_unused (void)
{
int n = (char *)&s.j - (char *)&s;
char *p = (char *)&s;
__builtin_memcmp (p, a, n);
__builtin_memcmp (a, p, n);
}
void memcmp_success_used (void)
{
int n = (char *)&s.j - (char *)&s;
char *p = (char *)&s;
if (__builtin_memcmp (p, a, n)
|| __builtin_memcmp (a, p, n))
__builtin_abort ();
}
void memcmp_fail_unused (void)
{
int n = (char *)&s.j - (char *)&s;
char *p = (char *)&s;
__builtin_memcmp (p, a, n);
__builtin_memcmp (a, p, n);
}
void memcmp_fail_used (void)
{
int n = (char *)&s.j - (char *)&s;
char *p = (char *)&s;
if (__builtin_memcmp (p, a, n)
|| __builtin_memcmp (a, p, n))
__builtin_abort ();
}
/* { dg-prune-output "\\\[-Wunused-value" }
{ dg-final { scan-tree-dump-not "abort" "optimized" } }
{ dg-final { scan-tree-dump-not "memcmp \\\(" "optimized" } } */
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