gcc/testsuite/gcc.dg/pr86835.c

   1 /* PR tree-optimization/86835 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O2 -ffast-math -Wuninitialized" } */
   4
   5 __attribute__((noipa)) void
   6 foo (int n, double *x, double *y)
   7 {               /* { dg-bogus "is used uninitialized in this function" "" { target *-*-* } 0 } */
   8   int i;
   9   double b = y[4];
  10   for (i = 0; i < n; ++i)
  11     y[3] += __builtin_sin (x[i] / b);
  12   y[0] /= b;
  13   y[1] /= b * b;
  14   y[2] /= b;
  15 }
  16
  17 int
  18 main ()
  19 {
  20   double y[] = { 16.0, 64.0, 128.0, 0.0, 2.0 };
  21   foo (0, y, y);
  22   if (__builtin_fabs (y[0] - 8.0) > 0.0001
  23       || __builtin_fabs (y[1] - 16.0) > 0.0001
  24       || __builtin_fabs (y[2] - 64.0) > 0.0001
  25       || y[3] != 0.0
  26       || y[4] != 2.0)
  27     __builtin_abort ();
  28   return 0;
  29 }