gcc/testsuite/gcc.dg/pr78408-1.c

   1 /* PR c/78408 */
   2 /* { dg-do compile { target size32plus } } */
   3 /* { dg-options "-O2 -fdump-tree-fab1-details" } */
   4 /* { dg-final { scan-tree-dump-times "after previous" 17 "fab1" } } */
   5
   6 struct S { char a[32]; };
   7 struct T { char a[65536]; };
   8 void bar (int, struct S *, struct S *, struct T *, struct T *);
   9 void baz (char *, char *);
  10
  11 void
  12 f1 (void)
  13 {
  14   struct S a, b;
  15   struct T c, d;
  16   a = b = (struct S) {};
  17   c = d = (struct T) {};
  18   bar (1, &a, &b, &c, &d);
  19 }
  20
  21 void
  22 f2 (void)
  23 {
  24   struct S a, b;
  25   struct T c, d;
  26   b = (struct S) {};
  27   a = b;
  28   d = (struct T) {};
  29   c = d;
  30   bar (2, &a, &b, &c, &d);
  31 }
  32
  33 void
  34 f3 (void)
  35 {
  36   struct S a, b;
  37   struct T c, d;
  38   __builtin_memset (&b, 0, sizeof (b));
  39   a = b;
  40   __builtin_memset (&d, 0, sizeof (d));
  41   c = d;
  42   bar (3, &a, &b, &c, &d);
  43 }
  44
  45
  46 void
  47 f4 (void)
  48 {
  49   struct S a, b;
  50   struct T c, d;
  51   b = (struct S) {};
  52   __builtin_memcpy (&a, &b, sizeof (b));
  53   d = (struct T) {};
  54   __builtin_memcpy (&c, &d, sizeof (d));
  55   bar (4, &a, &b, &c, &d);
  56 }
  57
  58 void
  59 f5 (void)
  60 {
  61   struct S a, b;
  62   struct T c, d;
  63   __builtin_memset (&b, 0, sizeof (b));
  64   __builtin_memcpy (&a, &b, sizeof (b));
  65   __builtin_memset (&d, 0, sizeof (d));
  66   __builtin_memcpy (&c, &d, sizeof (d));
  67   bar (5, &a, &b, &c, &d);
  68 }
  69
  70 void
  71 f6 (void)
  72 {
  73   struct S a, b, e, g;
  74   struct T c, d, f, h;
  75   g = e = a = b = (struct S) {};
  76   h = f = c = d = (struct T) {};
  77   bar (6, &a, &b, &c, &d);
  78   bar (6, &e, &g, &f, &h);
  79 }
  80
  81 void
  82 f7 (void)
  83 {
  84   char a[64], b[64];
  85   __builtin_memset (a + 13, 2, 27);
  86   __builtin_memcpy (b + 4, a + 17, 23);
  87   baz (a, b);
  88 }