gcc/testsuite/gcc.dg/pr108692.c

   1 /* PR tree-optimization/108692 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -ftree-vectorize" } */
   4
   5 __attribute__((noipa)) int
   6 foo (signed char *x, signed char *y, int n)
   7 {
   8   int i, r = 0;
   9   signed char a, b;
  10   for (i = 0; i < n; i++)
  11     {
  12       a = x[i];
  13       b = y[i];
  14       int c = (unsigned char) a - (unsigned char) b;
  15       r = r + (c < 0 ? -c : c);
  16     }
  17   return r;
  18 }
  19
  20 int
  21 main ()
  22 {
  23   signed char x[64] = {}, y[64] = {};
  24   if (__CHAR_BIT__ != 8 || __SIZEOF_INT__ != 4)
  25     return 0;
  26   x[32] = -128;
  27   y[32] = 1;
  28   if (foo (x, y, 64) != 127)
  29     __builtin_abort ();
  30   return 0;
  31 }