gcc/testsuite/gcc.dg/pr30957-1.c

   1 /* { dg-do run { xfail *-*-* } } */
   2 /* We don't (and don't want to) perform this optimisation on soft-float
   3    targets, where each addition is a library call.  This test requires
   4    -fassociative-math for enabling the variable-expansion as well as
   5    -fsigned-zeros for honoring the sign of zero; but
   6    they can not co-exist; also under -funsafe-math-optimizations, so we
   7    expect it to fail.  */
   8 /* { dg-require-effective-target hard_float } */
   9 /* { dg-options "-O2 -funroll-loops -funsafe-math-optimizations -fvariable-expansion-in-unroller -fdump-rtl-loop2_unroll" } */
  10
  11 extern void abort (void);
  12 extern void exit (int);
  13
  14 float __attribute__((noinline))
  15 foo (float d, int n)
  16 {
  17   unsigned i;
  18   float accum = d;
  19
  20   for (i = 0; i < n; i++)
  21     accum += d;
  22
  23   return accum;
  24 }
  25
  26 int
  27 main ()
  28 {
  29   if (__builtin_copysignf (1.0, foo (0.0 / -5.0, 10)) != -1.0)
  30     abort ();
  31   exit (0);
  32 }
  33
  34 /* { dg-final { scan-rtl-dump "Expanding Accumulator" "loop2_unroll" } } */
  35 /* { dg-final { cleanup-rtl-dump "loop*" } } */
  36
  37