/* @(#)s_expm1.c 1.2 95/01/04 */
/* $Id: s_expm1.c,v 1.7 2010/05/12 07:07:16 anczane1 Exp $ */
/*
 * ====================================================
 * 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.
 * ====================================================
 */

/* expm1(x)
 * Returns exp(x)-1, the exponential of x minus 1.
 *
 * Method
 *   1. Argument reduction:
 *	Given x, find r and integer k such that
 *
 *               x = k*ln2 + r,  |r| <= 0.5*ln2 ~ 0.34658
 *
 *      Here a correction term c will be computed to compensate
 *	the error in r when rounded to a floating-point number.
 *
 *   2. Approximating expm1(r) by a special rational function on
 *	the interval [0,0.34658]:
 *	Since
 *	    r*(exp(r)+1)/(exp(r)-1) = 2+ r^2/6 - r^4/360 + ...
 *	we define R1(r*r) by
 *	    r*(exp(r)+1)/(exp(r)-1) = 2+ r^2/6 * R1(r*r)
 *	That is,
 *	    R1(r**2) = 6/r *((exp(r)+1)/(exp(r)-1) - 2/r)
 *		     = 6/r * ( 1 + 2.0*(1/(exp(r)-1) - 1/r))
 *		     = 1 - r^2/60 + r^4/2520 - r^6/100800 + ...
 *      We use a special Reme algorithm on [0,0.347] to generate
 * 	a polynomial of degree 5 in r*r to approximate R1. The
 *	maximum error of this polynomial approximation is bounded
 *	by 2**-61. In other words,
 *	    R1(z) ~ 1.0 + Q1*z + Q2*z**2 + Q3*z**3 + Q4*z**4 + Q5*z**5
 *	where 	Q1  =  -1.6666666666666567384E-2,
 * 		Q2  =   3.9682539681370365873E-4,
 * 		Q3  =  -9.9206344733435987357E-6,
 * 		Q4  =   2.5051361420808517002E-7,
 * 		Q5  =  -6.2843505682382617102E-9;
 *  	(where z=r*r, and the values of Q1 to Q5 are listed below)
 *	with error bounded by
 *	    |                  5           |     -61
 *	    | 1.0+Q1*z+...+Q5*z   -  R1(z) | <= 2
 *	    |                              |
 *
 *	expm1(r) = exp(r)-1 is then computed by the following
 * 	specific way which minimize the accumulation rounding error:
 *			       2     3
 *			      r     r    [ 3 - (R1 + R1*r/2)  ]
 *	      expm1(r) = r + --- + --- * [--------------------]
 *		              2     2    [ 6 - r*(3 - R1*r/2) ]
 *
 *	To compensate the error in the argument reduction, we use
 *		expm1(r+c) = expm1(r) + c + expm1(r)*c
 *			   ~ expm1(r) + c + r*c
 *	Thus c+r*c will be added in as the correction terms for
 *	expm1(r+c). Now rearrange the term to avoid optimization
 * 	screw up:
 *		        (      2                                    2 )
 *		        ({  ( r    [ R1 -  (3 - R1*r/2) ]  )  }    r  )
 *	 expm1(r+c)~r - ({r*(--- * [--------------------]-c)-c} - --- )
 *	                ({  ( 2    [ 6 - r*(3 - R1*r/2) ]  )  }    2  )
 *                      (                                             )
 *
 *		   = r - E
 *   3. Scale back to obtain expm1(x):
 *	From step 1, we have
 *	   expm1(x) = either 2^k*[expm1(r)+1] - 1
 *		    = or     2^k*[expm1(r) + (1-2^-k)]
 *   4. Implementation notes:
 *	(A). To save one multiplication, we scale the coefficient Qi
 *	     to Qi*2^i, and replace z by (x^2)/2.
 *	(B). To achieve maximum accuracy, we compute expm1(x) by
 *	  (i)   if x < -56*ln2, return -1.0, (raise inexact if x!=inf)
 *	  (ii)  if k=0, return r-E
 *	  (iii) if k=-1, return 0.5*(r-E)-0.5
 *        (iv)	if k=1 if r < -0.25, return 2*((r+0.5)- E)
 *	       	       else	     return  1.0+2.0*(r-E);
 *	  (v)   if (k<-2||k>56) return 2^k(1-(E-r)) - 1 (or exp(x)-1)
 *	  (vi)  if k <= 20, return 2^k((1-2^-k)-(E-r)), else
 *	  (vii) return 2^k(1-((E+2^-k)-r))
 *
 * Special cases:
 *	expm1(INF) is INF, expm1(NaN) is NaN;
 *	expm1(-INF) is -1, and
 *	for finite argument, only expm1(0)=0 is exact.
 *
 * Accuracy:
 *	according to an error analysis, the error is always less than
 *	1 ulp (unit in the last place).
 *
 * Misc. info.
 *	For IEEE double
 *	    if x >  7.09782712893383973096e+02 then expm1(x) overflow
 *
 * Constants:
 * The hexadecimal values are the intended ones for the following
 * constants. The decimal values may be used, provided that the
 * compiler will convert from decimal to binary accurately enough
 * to produce the hexadecimal values shown.
 */

#include <ansi_parms.h>

#if _EWL_FLOATING_POINT && _EWL_USES_SUN_DP_MATH_LIB

#include <fdlibm.h>
#include <fenv.h>

#ifdef __STDC__
static const f64_t
#else
static f64_t
#endif
one		= 1.0,
big 		= 1.0e+300,
tiny		= 1.0e-300,
o_threshold	= 7.09782712893383973096e+02,/* 0x40862E42, 0xFEFA39EF */
ln2_hi		= 6.93147180369123816490e-01,/* 0x3fe62e42, 0xfee00000 */
ln2_lo		= 1.90821492927058770002e-10,/* 0x3dea39ef, 0x35793c76 */
invln2		= 1.44269504088896338700e+00,/* 0x3ff71547, 0x652b82fe */
	/* scaled coefficients related to expm1 */
Q1  =  -3.33333333333331316428e-02, /* BFA11111 111110F4 */
Q2  =   1.58730158725481460165e-03, /* 3F5A01A0 19FE5585 */
Q3  =  -7.93650757867487942473e-05, /* BF14CE19 9EAADBB7 */
Q4  =   4.00821782732936239552e-06, /* 3ED0CFCA 86E65239 */
Q5  =  -2.01099218183624371326e-07; /* BE8AFDB7 6E09C32D */

#ifdef __STDC__
	f64_t _EWL_MATH_CDECL expm1(f64_t x)
#else
	f64_t __expm1(x)
	f64_t x;
#endif
{
	f64_t y,hi,lo,c=0.0,t,e,hxs,hfx,r1;
	int32_t k,xsb;
	uint32_t hx;

	hx  = GET_DOUBLE_UHI_WORD(x);	/* high word of x */
	xsb = (hx&0x80000000L)?1:0;		/* sign bit of x */
	if(xsb==0L) {
		y=x;
	} else {
		y= -x;	/* y = |x| */
	}
	hx &= 0x7fffffffUL;		/* high word of |x| */

    /* filter out big and non-finite argument */
	if(hx >= 0x4043687AUL) {			/* if |x|>=56*ln2 */
	    if(hx >= 0x40862E42UL) {		/* if |x|>=709.78... */
            if(hx>=0x7ff00000UL) {
			    if(((hx&0xfffffUL)|GET_DOUBLE_ULO_WORD(x))!=0uL) {
					MISRA_EXCEPTION_RULE_14_7()
					return x+x; 	 /* NaN */
			    } else {
					MISRA_EXCEPTION_RULE_14_7()
			    	return (xsb==0L)? x:-1.0;/* exp(+-inf)={inf,-1} */
		        }
	        }
	        if(x > o_threshold) {
				#if _EWL_C99
					MISRA_EXCEPTION_RULE_13_7()
					if ((uint_t)math_errhandling & (uint_t)MATH_ERRNO) {
						MISRA_EXCEPTION_RULE_20_5()
						errno=ERANGE;
					}
				#endif		
				MISRA_EXCEPTION_RULE_14_7()
				return big*big;
			} /* overflow */
	    }
	    if(xsb!=0L) { /* x < -56*ln2, return -1.0 with inexact */
			if((x+tiny)<0.0) {		/* raise inexact */
				#if _EWL_C99
					MISRA_EXCEPTION_RULE_13_7()
					if ((uint_t)math_errhandling & (uint_t)MATH_ERRNO) {
						MISRA_EXCEPTION_RULE_20_5()
						errno=ERANGE;
					}
				#endif		
				MISRA_EXCEPTION_RULE_14_7()
				return tiny-one;	/* return -1 */
	    	}
	    }
	}

    /* argument reduction */
	if(hx > 0x3fd62e42UL) {		/* if  |x| > 0.5 ln2 */
	    if(hx < 0x3FF0A2B2UL) {	/* and |x| < 1.5 ln2 */
			if(xsb==0L) {
				hi = x - ln2_hi; lo =  ln2_lo;  k =  1;
			} else {
				hi = x + ln2_hi; lo = -ln2_lo;  k = -1;
			}
	    } else {
			t  = (invln2*x)+((xsb==0L)?0.5:-0.5);
			k  = (int32_t)t;
			t  = (f64_t)k;
			hi = x - (t*ln2_hi);	/* t*ln2_hi is exact here */
			lo = t*ln2_lo;
	    }
	    x  = hi - lo;
	    c  = (hi-x)-lo;
	}
	else if(hx < 0x3c900000UL) {  	/* when |x|<2**-54, return x */
	    t = big+x;	/* return x with inexact flags when x!=0 */
		MISRA_EXCEPTION_RULE_14_7()
	    return x - (t-(big+x));
	}
	else {
		k = 0;
	}

    /* x is now in primary range */
	hfx = 0.5*x;
	hxs = x*hfx;
	r1 = one+(hxs*(Q1+(hxs*(Q2+(hxs*(Q3+(hxs*(Q4+(hxs*Q5)))))))));
	t  = 3.0-(r1*hfx);
	e  = hxs*((r1-t)/(6.0 - (x*t)));
	if(k==0L) {
		MISRA_EXCEPTION_RULE_14_7()
		return x - ((x*e)-hxs);		/* c is 0 */
	} else {
	    e  = ((x*(e-c))-c);
	    e -= hxs;
	    if(k== -1L) {
			MISRA_EXCEPTION_RULE_14_7()
	    	return (0.5*(x-e))-0.5;
	    }
	    if(k==1L) {
	       	if(x < -0.25) {
				MISRA_EXCEPTION_RULE_14_7()
	       		return -2.0*(e-(x+0.5));
	       	} else {
				MISRA_EXCEPTION_RULE_14_7()
	       	    return  one+(2.0*(x-e));
	       	}
	    }
	    if ((k <= -2L) || (k>56L)) {   /* suffice to return exp(x)-1 */
	        y = one-(e-x);
	        MISRA_EXCEPTION_RULE_12_7()
	        GET_DOUBLE_HI_WORD(y) += (k<<20);	/* add k to y's exponent */
			MISRA_EXCEPTION_RULE_14_7()
	        return y-one;
	    }
	    t = one;
	    MISRA_EXCEPTION_RULE_12_7()
	    if(k<20L) {
	       	GET_DOUBLE_HI_WORD(t) = 0x3ff00000L - (0x200000L>>k);  /* t=1-2^-k */
	       	y = t-(e-x);
	       	GET_DOUBLE_HI_WORD(y) += (k<<20);	/* add k to y's exponent */
		} else {
	       	GET_DOUBLE_HI_WORD(t)  = ((0x3ffL-k)<<20);	/* 2^-k */
	       	y = x-(e+t);
	       	y += one;
	       	GET_DOUBLE_HI_WORD(y) += (k<<20);	/* add k to y's exponent */
	    }
	}
	return y;
}

#endif /* _EWL_FLOATING_POINT  */
