gcc/testsuite/gcc.dg/pr65779.c

   1 /* PR debug/65779 */
   2 /* { dg-do assemble } */
   3 /* { dg-options "-O2 -fcompare-debug" } */
   4 /* { dg-xfail-if "" { powerpc-ibm-aix* } } */
   5
   6 unsigned long
   7 foo (unsigned long x, unsigned char *y, unsigned int z)
   8 {
   9   unsigned long a = x & 0xffff;
  10   unsigned long b = (x >> 16) & 0xffff;
  11   int k;
  12   if (y == 0) return 1L;
  13   while (z > 0)
  14     {
  15       k = z < 5552 ? z : 5552;
  16       z -= k;
  17       while (k >= 16)
  18         {
  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           a += *y++; b += a;
  35           k -= 16;
  36         }
  37       if (k != 0)
  38         do { a += *y++; b += a; } while (--k);
  39       a %= 65521L;
  40       b %= 65521L;
  41     }
  42   return (b << 16) | a;
  43 }