Quelle s_sinf.cpp Sprache: C

/* s_sinf.c -- float version of s_sin.c.
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
* Optimized by Bruce D. Evans.
*/

/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/

//#include <sys/cdefs.h>
//__FBSDID("$FreeBSD$");

#include <float.h>

#define INLINE_KERNEL_COSDF
#define INLINE_KERNEL_SINDF
#define INLINE_REM_PIO2F
#include "math_private.h"
#include "e_rem_pio2f.cpp"
#include "k_cosf.cpp"
#include "k_sinf.cpp"

/* Small multiples of pi/2 rounded to double precision. */
static const double
s1pio2 = 1*M_PI_2,   /* 0x3FF921FB, 0x54442D18 */
s2pio2 = 2*M_PI_2,   /* 0x400921FB, 0x54442D18 */
s3pio2 = 3*M_PI_2,   /* 0x4012D97C, 0x7F3321D2 */
s4pio2 = 4*M_PI_2;   /* 0x401921FB, 0x54442D18 */

float
sinf(float x)
{
double y;
int32_t n, hx, ix;

GET_FLOAT_WORD(hx,x);
ix = hx & 0x7fffffff;

if(ix <= 0x3f490fda) {  /* |x| ~<= pi/4 */
     if(ix<0x39800000)  /* |x| < 2**-12 */
  if(((int)x)==0) return x; /* x with inexact if x != 0 */
     return __kernel_sindf(x);
}
if(ix<=0x407b53d1) {  /* |x| ~<= 5*pi/4 */
     if(ix<=0x4016cbe3) { /* |x| ~<= 3pi/4 */
  if(hx>0)
      return __kernel_cosdf(x - s1pio2);
  else
      return -__kernel_cosdf(x + s1pio2);
     } else
  return __kernel_sindf((hx > 0 ? s2pio2 : -s2pio2) - x);
}
if(ix<=0x40e231d5) {  /* |x| ~<= 9*pi/4 */
     if(ix<=0x40afeddf) { /* |x| ~<= 7*pi/4 */
  if(hx>0)
      return -__kernel_cosdf(x - s3pio2);
  else
      return __kernel_cosdf(x + s3pio2);
     } else
  return __kernel_sindf(x + (hx > 0 ? -s4pio2 : s4pio2));
}

    /* sin(Inf or NaN) is NaN */
else if (ix>=0x7f800000) return x-x;

    /* general argument reduction needed */
else {
     n = __ieee754_rem_pio2f(x,&y);
     switch(n&3) {
  case 0: return  __kernel_sindf(y);
  case 1: return  __kernel_cosdf(y);
  case 2: return  __kernel_sindf(-y);
  default:
   return -__kernel_cosdf(y);
     }
}
}

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