gcc/testsuite/gcc.c-torture/execute/pr82524.c

   1 /* PR target/82524 */
   2
   3 struct S { unsigned char b, g, r, a; };
   4 union U { struct S c; unsigned v; };
   5
   6 static inline unsigned char
   7 foo (unsigned char a, unsigned char b)
   8 {
   9   return ((a + 1) * b) >> 8;
  10 }
  11
  12 __attribute__((noinline, noclone)) unsigned
  13 bar (union U *x, union U *y)
  14 {
  15   union U z;
  16   unsigned char v = x->c.a;
  17   unsigned char w = foo (y->c.a, 255 - v);
  18   z.c.r = foo (x->c.r, v) + foo (y->c.r, w);
  19   z.c.g = foo (x->c.g, v) + foo (y->c.g, w);
  20   z.c.b = foo (x->c.b, v) + foo (y->c.b, w);
  21   z.c.a = 0;
  22   return z.v;
  23 }
  24
  25 int
  26 main ()
  27 {
  28   union U a, b, c;
  29   if ((unsigned char) ~0 != 255 || sizeof (unsigned) != 4)
  30     return 0;
  31   a.c = (struct S) { 255, 255, 255, 0 };
  32   b.c = (struct S) { 255, 255, 255, 255 };
  33   c.v = bar (&a, &b);
  34   if (c.c.b != 255 || c.c.g != 255 || c.c.r != 255 || c.c.a != 0)
  35     __builtin_abort ();
  36   return 0;
  37 }