Viewing file:  strncmp-3.c (1.49 KB) -rw-r--r--
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/* PR middle-end/95189 - memcmp being wrongly stripped like strcmp
{ dg-do run }
{ dg-options "-O2 -Wall" } */
#define AB_D "ab\0d"
#define ABCDEF_H "abcdef\0h"
#define ABCDEFGHIJKLMN_P "abcdefghijklmn\0p"
char ab_d[] = AB_D;
char abcdef_h[] = ABCDEF_H;
extern int strncmp (const char*, const char*, __SIZE_TYPE__);
__attribute__((noipa)) void sink (const void *p, ...) { (void)&p; }
#define strncmp(a, b, n) (sink (a, b), strncmp (a, b, n))
int main (void)
{
int zero = 0;
zero += strncmp (ab_d, AB_D, 1);
zero += strncmp (ab_d, AB_D, 2);
zero += strncmp (ab_d, AB_D, 3);
zero += strncmp (ab_d, AB_D, 4);
zero += strncmp (ab_d, AB_D, 5);
zero += strncmp (ab_d, ABCDEF_H, 1);
zero += strncmp (ab_d, ABCDEF_H, 2);
zero += strncmp (abcdef_h, AB_D, 2);
zero += strncmp (abcdef_h, ABCDEF_H, 2);
zero += strncmp (abcdef_h, ABCDEF_H, 3);
zero += strncmp (abcdef_h, ABCDEF_H, 4);
zero += strncmp (abcdef_h, ABCDEF_H, 5);
zero += strncmp (abcdef_h, ABCDEF_H, 6);
zero += strncmp (abcdef_h, ABCDEF_H, 7);
zero += strncmp (abcdef_h, ABCDEF_H, 8);
zero += strncmp (abcdef_h, ABCDEF_H, 9);
if (zero != 0)
__builtin_abort ();
int neg = 0;
neg -= strncmp (ab_d, ABCDEF_H, 3) < 0;
neg -= strncmp (ab_d, ABCDEF_H, 4) < 0;
neg -= strncmp (ab_d, ABCDEF_H, 5) < 0;
neg -= strncmp (ab_d, ABCDEF_H, 6) < 0;
neg -= strncmp (ab_d, ABCDEF_H, 7) < 0;
neg -= strncmp (ab_d, ABCDEF_H, 8) < 0;
neg -= strncmp (ab_d, ABCDEF_H, 9) < 0;
if (neg != -7)
__builtin_abort ();
}
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