gcc/testsuite/gcc.target/i386/pr42549.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target 3dnow } */
   3 /* { dg-options "-O2 -m3dnow" } */
   4
   5 #include "mmx-3dnow-check.h"
   6
   7 #include <mm3dnow.h>
   8
   9 typedef union {
  10   float f[2];
  11   __m64 v;
  12 } vec_t;
  13
  14 void __attribute__ ((noinline))
  15 Butterfly_3 (__m64 * D, __m64 SC)
  16 {
  17   __m64 T, T1;
  18
  19   T = _m_pfmul (D[1], SC);
  20   T1 = D[0];
  21   D[0] = _m_pfadd (T1, T);
  22   D[1] = _m_pfsub (T1, T);
  23 }
  24
  25 static void
  26 mmx_3dnow_test (void)
  27 {
  28   vec_t D[2] = { { .f = { 2.0f, 3.0f } },
  29                  { .f = { 4.0f, 5.0f } } };
  30
  31   const vec_t SC = { .f = { 1.0f, 1.0f } };
  32
  33   Butterfly_3 (&D[0].v, SC.v);
  34   _m_femms ();
  35
  36   if (D[1].f[0] != -2.0f || D[1].f[1] != -2.0f)
  37     abort ();
  38 }