gcc/testsuite/gcc.target/i386/xorsign.c

/* { dg-do run { target sse2_runtime } } */
/* { dg-options "-O2 -msse2 -mfpmath=sse -ftree-vectorize -fdump-tree-vect-details -save-temps" } */

extern void abort ();

#define N 16
float a[N] = {-0.1f, -3.2f, -6.3f, -9.4f,
	      -12.5f, -15.6f, -18.7f, -21.8f,
	      24.9f, 27.1f, 30.2f, 33.3f,
	      36.4f, 39.5f, 42.6f, 45.7f};
float b[N] = {-1.2f, 3.4f, -5.6f, 7.8f,
	      -9.0f, 1.0f, -2.0f, 3.0f,
	      -4.0f, -5.0f, 6.0f, 7.0f,
	      -8.0f, -9.0f, 10.0f, 11.0f};
float r[N];

double ad[N] = {-0.1d,  -3.2d,  -6.3d,  -9.4d,
		-12.5d, -15.6d, -18.7d, -21.8d,
		 24.9d,  27.1d,  30.2d,  33.3d,
		 36.4d,  39.5d,  42.6d, 45.7d};
double bd[N] = {-1.2d,  3.4d, -5.6d,  7.8d,
		-9.0d,  1.0d, -2.0d,  3.0d,
		-4.0d, -5.0d,  6.0d,  7.0d,
		-8.0d, -9.0d, 10.0d, 11.0d};
double rd[N];

int
main (void)
{
  int i;

  for (i = 0; i < N; i++)
    r[i] = a[i] * __builtin_copysignf (1.0f, b[i]);

  /* check results:  */
  for (i = 0; i < N; i++)
    if (r[i] != a[i] * __builtin_copysignf (1.0f, b[i]))
      abort ();

  for (i = 0; i < N; i++)
    rd[i] = ad[i] * __builtin_copysign (1.0d, bd[i]);

  /* check results:  */
  for (i = 0; i < N; i++)
    if (rd[i] != ad[i] * __builtin_copysign (1.0d, bd[i]))
      abort ();

  return 0;
}

/* { dg-final { scan-tree-dump-times "vectorized 2 loops" 1 "vect" } } */
/* { dg-final { scan-assembler "\[ \t\]xor" } } */
/* { dg-final { scan-assembler "\[ \t\]and" } } */
/* { dg-final { scan-assembler-not "copysign" } } */
/* { dg-final { scan-assembler-not "\[ \t\]fxam" } } */
/* { dg-final { scan-assembler-not "\[ \t\]or" } } */
/* { dg-final { scan-assembler-not "\[ \t\]mul" } } */