gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-37.c

   1 /* { dg-options "-O2 -fdump-tree-dse-details -fno-tree-fre" } */
   2
   3
   4 #ifndef SCOPE
   5 #define SCOPE
   6 #endif
   7
   8 extern void frob (char *);
   9
  10 void g (char *s)
  11 {
  12   SCOPE char a[8];
  13   __builtin_strncpy (a, s, sizeof a);
  14   __builtin_memset (a, 0, sizeof a);
  15   frob (a);
  16 }
  17
  18 void h (char *s)
  19 {
  20   SCOPE char a[8];
  21   __builtin_memset (a, 0, sizeof a);
  22   __builtin_strncpy (a, s, sizeof a);
  23   frob (a);
  24 }
  25
  26 void i (char *s)
  27 {
  28   SCOPE char a[8];
  29   __builtin_strncpy (a, s, sizeof a);
  30   __builtin_memset (a, 0, sizeof a - 5);
  31   frob (a);
  32 }
  33
  34 void j (char *s)
  35 {
  36   SCOPE char a[8];
  37   __builtin_memset (a, 0, sizeof a);
  38   __builtin_strncpy (a, s, sizeof a - 5);
  39   frob (a);
  40 }
  41
  42 void l (char *s)
  43 {
  44   SCOPE char a[8];
  45   __builtin_strncpy (a, s, sizeof a);
  46   __builtin_memset (a + 2, 0, sizeof a - 2);
  47   frob (a);
  48 }
  49
  50 void m (char *s)
  51 {
  52   SCOPE char a[8];
  53   __builtin_memset (a, 0, sizeof a);
  54   __builtin_strncpy (a + 2, s, sizeof a - 2);
  55   frob (a);
  56 }
  57
  58 /* { dg-final { scan-tree-dump-times "Deleted dead call" 2 "dse1" } } */
  59 /* { dg-final { scan-tree-dump-times "Trimming statement " 4 "dse1" } } */
  60