gcc/testsuite/gcc.dg/pr65779.c

   1 /* PR debug/65779 */
   2 /* { dg-do assemble } */
   3 /* { dg-options "-O2 -fcompare-debug" } */
   4
   5 unsigned long
   6 foo (unsigned long x, unsigned char *y, unsigned int z)
   7 {
   8   unsigned long a = x & 0xffff;
   9   unsigned long b = (x >> 16) & 0xffff;
  10   int k;
  11   if (y == 0) return 1L;
  12   while (z > 0)
  13     {
  14       k = z < 5552 ? z : 5552;
  15       z -= k;
  16       while (k >= 16)
  17         {
  18           a += *y++; b += a;
  19           a += *y++; b += a;
  20           a += *y++; b += a;
  21           a += *y++; b += a;
  22           a += *y++; b += a;
  23           a += *y++; b += a;
  24           a += *y++; b += a;
  25           a += *y++; b += a;
  26           a += *y++; b += a;
  27           a += *y++; b += a;
  28           a += *y++; b += a;
  29           a += *y++; b += a;
  30           a += *y++; b += a;
  31           a += *y++; b += a;
  32           a += *y++; b += a;
  33           a += *y++; b += a;
  34           k -= 16;
  35         }
  36       if (k != 0)
  37         do { a += *y++; b += a; } while (--k);
  38       a %= 65521L;
  39       b %= 65521L;
  40     }
  41   return (b << 16) | a;
  42 }