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

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