gcc/testsuite/gcc.c-torture/execute/pr27285.c

   1 /* PR tree-optimization/27285 */
   2
   3 extern void abort (void);
   4
   5 struct S { unsigned char a, b, c, d[16]; };
   6
   7 void __attribute__ ((noinline))
   8 foo (struct S *x, struct S *y)
   9 {
  10   int a, b;
  11   unsigned char c, *d, *e;
  12
  13   b = x->b;
  14   d = x->d;
  15   e = y->d;
  16   a = 0;
  17   while (b)
  18     {
  19       if (b >= 8)
  20         {
  21           c = 0xff;
  22           b -= 8;
  23         }
  24       else
  25         {
  26           c = 0xff << (8 - b);
  27           b = 0;
  28         }
  29
  30       e[a] = d[a] & c;
  31       a++;
  32     }
  33 }
  34
  35 int
  36 main (void)
  37 {
  38   struct S x = { 0, 25, 0, { 0xaa, 0xbb, 0xcc, 0xdd }};
  39   struct S y = { 0, 0, 0, { 0 }};
  40
  41   foo (&x, &y);
  42   if (x.d[0] != y.d[0] || x.d[1] != y.d[1]
  43       || x.d[2] != y.d[2] || (x.d[3] & 0x80) != y.d[3])
  44     abort ();
  45    return 0;
  46 }