gcc/testsuite/gcc.target/i386/pr80706.c

   1 /* PR target/80706 */
   2 /* { dg-do run { target sse2_runtime } } */
   3 /* { dg-options "-O2 -msse2" } */
   4
   5 union U { double value; struct S { int lsw; int msw; } parts; };
   6
   7 __attribute__((noinline, noclone)) double
   8 foo (void)
   9 {
  10   __asm volatile ("" : : : "memory");
  11   return 2.0;
  12 }
  13
  14 __attribute__((noinline, noclone)) double
  15 bar (void)
  16 {
  17   double s = foo ();
  18   union U z;
  19   z.value = s;
  20   z.parts.lsw = 0;
  21   return z.value * z.value + s * s;
  22 }
  23
  24 int
  25 main ()
  26 {
  27   if (bar () != 8.0)
  28     __builtin_abort ();
  29   return 0;
  30 }