gcc/testsuite/gcc.dg/torture/fp-int-convert-timode-1.c

   1 /* Test for correct rounding of conversions from __int128 to
   2    float.  */
   3 /* { dg-do run } */
   4 /* { dg-require-effective-target int128 } */
   5 /* { dg-options "-frounding-math" } */
   6
   7 #include <stdlib.h>
   8
   9 int
  10 main (void)
  11 {
  12   volatile unsigned long long h = 0x8000000000000000LL;
  13   volatile unsigned long long l = 0xdLL;
  14   volatile unsigned __int128 u128 = (((unsigned __int128) h) << 64) | l;
  15   volatile __int128 s128 = u128;
  16   float fs = s128;
  17   if (fs != -0x1p+127)
  18     abort ();
  19   double ds = s128;
  20   if (ds != -0x1p+127)
  21     abort ();
  22   exit (0);
  23 }