gcc/testsuite/gcc.dg/strncmp-3.c

   1 /* PR middle-end/95189 - memcmp being wrongly stripped like strcmp
   2    { dg-do run }
   3    { dg-options "-O2 -Wall" } */
   4
   5 #define AB_D "ab\0d"
   6 #define ABCDEF_H "abcdef\0h"
   7 #define ABCDEFGHIJKLMN_P "abcdefghijklmn\0p"
   8
   9 char ab_d[] = AB_D;
  10 char abcdef_h[] = ABCDEF_H;
  11
  12 extern int strncmp (const char*, const char*, __SIZE_TYPE__);
  13
  14 __attribute__((noipa)) void sink (const void *p, ...) { (void)&p; }
  15
  16 #define strncmp(a, b, n) (sink (a, b), strncmp (a, b, n))
  17
  18 int main (void)
  19 {
  20   int zero = 0;
  21
  22   zero += strncmp (ab_d, AB_D, 1);
  23   zero += strncmp (ab_d, AB_D, 2);
  24   zero += strncmp (ab_d, AB_D, 3);
  25   zero += strncmp (ab_d, AB_D, 4);
  26   zero += strncmp (ab_d, AB_D, 5);
  27
  28   zero += strncmp (ab_d, ABCDEF_H, 1);
  29   zero += strncmp (ab_d, ABCDEF_H, 2);
  30
  31   zero += strncmp (abcdef_h, AB_D, 2);
  32
  33   zero += strncmp (abcdef_h, ABCDEF_H, 2);
  34   zero += strncmp (abcdef_h, ABCDEF_H, 3);
  35   zero += strncmp (abcdef_h, ABCDEF_H, 4);
  36   zero += strncmp (abcdef_h, ABCDEF_H, 5);
  37   zero += strncmp (abcdef_h, ABCDEF_H, 6);
  38   zero += strncmp (abcdef_h, ABCDEF_H, 7);
  39   zero += strncmp (abcdef_h, ABCDEF_H, 8);
  40   zero += strncmp (abcdef_h, ABCDEF_H, 9);
  41
  42   if (zero != 0)
  43     __builtin_abort ();
  44
  45   int neg = 0;
  46
  47   neg -= strncmp (ab_d, ABCDEF_H, 3) < 0;
  48   neg -= strncmp (ab_d, ABCDEF_H, 4) < 0;
  49   neg -= strncmp (ab_d, ABCDEF_H, 5) < 0;
  50   neg -= strncmp (ab_d, ABCDEF_H, 6) < 0;
  51   neg -= strncmp (ab_d, ABCDEF_H, 7) < 0;
  52   neg -= strncmp (ab_d, ABCDEF_H, 8) < 0;
  53   neg -= strncmp (ab_d, ABCDEF_H, 9) < 0;
  54
  55   if (neg != -7)
  56     __builtin_abort ();
  57 }