text: /* s_logbf.c -- float version of s_logb.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.
   * ====================================================
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: releng/11.0/lib/msun/src/s_logbf.c 176451 2008-02-22 02:30:36Z das $");
  
  #include "math.h"
  #include "math_private.h"
  
  static const float
  two25 = 3.355443200e+07;		/* 0x4c000000 */
  
  float
  logbf(float x)
  {
  	int32_t ix;
  	GET_FLOAT_WORD(ix,x);
  	ix &= 0x7fffffff;			/* high |x| */
  	if(ix==0) return (float)-1.0/fabsf(x);
  	if(ix>=0x7f800000) return x*x;
  	if(ix<0x00800000) {
  		x *= two25;		 /* convert subnormal x to normal */
  		GET_FLOAT_WORD(ix,x);
  		ix &= 0x7fffffff;
  		return (float) ((ix>>23)-127-25);
  	} else
  		return (float) ((ix>>23)-127);
  }
  