text: /* s_cosf.c -- float version of s_cos.c.
   * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
   */
  
  /*
   * ====================================================
   * 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.
   * ====================================================
   */
  
  #if defined(LIBM_SCCS) && !defined(lint)
  static char rcsid[] = "$NetBSD: s_cosf.c,v 1.4 1995/05/10 20:47:03 jtc Exp $";
  #endif
  
  #include "math.h"
  #include "math_private.h"
  
  float
  cosf(float x)
  {
  	float y[2],z=0.0;
  	int32_t n,ix;
  
  	GET_FLOAT_WORD(ix,x);
  
      /* |x| ~< pi/4 */
  	ix &= 0x7fffffff;
  	if(ix <= 0x3f490fd8) return __kernel_cosf(x,z);
  
      /* cos(Inf or NaN) is NaN */
  	else if (ix>=0x7f800000) return x-x;
  
      /* argument reduction needed */
  	else {
  	    n = __ieee754_rem_pio2f(x,y);
  	    switch(n&3) {
  		case 0: return  __kernel_cosf(y[0],y[1]);
  		case 1: return -__kernel_sinf(y[0],y[1],1);
  		case 2: return -__kernel_cosf(y[0],y[1]);
  		default:
  		        return  __kernel_sinf(y[0],y[1],1);
  	    }
  	}
  }
  