text: /* s_tanf.c -- float version of s_tan.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: releng/11.1/lib/msun/src/s_tanf.c 176569 2008-02-25 22:19:17Z bde $");
  
  #include <float.h>
  
  #include "math.h"
  #define	INLINE_KERNEL_TANDF
  #define INLINE_REM_PIO2F
  #include "math_private.h"
  #include "e_rem_pio2f.c"
  #include "k_tanf.c"
  
  /* Small multiples of pi/2 rounded to double precision. */
  static const double
  t1pio2 = 1*M_PI_2,			/* 0x3FF921FB, 0x54442D18 */
  t2pio2 = 2*M_PI_2,			/* 0x400921FB, 0x54442D18 */
  t3pio2 = 3*M_PI_2,			/* 0x4012D97C, 0x7F3321D2 */
  t4pio2 = 4*M_PI_2;			/* 0x401921FB, 0x54442D18 */
  
  float
  tanf(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_tandf(x,1);
  	}
  	if(ix<=0x407b53d1) {		/* |x| ~<= 5*pi/4 */
  	    if(ix<=0x4016cbe3)		/* |x| ~<= 3pi/4 */
  		return __kernel_tandf(x + (hx>0 ? -t1pio2 : t1pio2), -1);
  	    else
  		return __kernel_tandf(x + (hx>0 ? -t2pio2 : t2pio2), 1);
  	}
  	if(ix<=0x40e231d5) {		/* |x| ~<= 9*pi/4 */
  	    if(ix<=0x40afeddf)		/* |x| ~<= 7*pi/4 */
  		return __kernel_tandf(x + (hx>0 ? -t3pio2 : t3pio2), -1);
  	    else
  		return __kernel_tandf(x + (hx>0 ? -t4pio2 : t4pio2), 1);
  	}
  
      /* tan(Inf or NaN) is NaN */
  	else if (ix>=0x7f800000) return x-x;
  
      /* general argument reduction needed */
  	else {
  	    n = __ieee754_rem_pio2f(x,&y);
  	    /* integer parameter: 1 -- n even; -1 -- n odd */
  	    return __kernel_tandf(y,1-((n&1)<<1));
  	}
  }
  