s_expm1f.c (59b19ff14a36bb975819fff8c7bd8648a9b29537) s_expm1f.c (a00672cff92a23dd28a5e6a1f3a52189eb0d7d7a)
1/* s_expm1f.c -- float version of s_expm1.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
1/* s_expm1f.c -- float version of s_expm1.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
16#ifndef lint
17static char rcsid[] = "$FreeBSD$";
18#endif
16#include <sys/cdefs.h>
17__FBSDID("$FreeBSD$");
19
20#include "math.h"
21#include "math_private.h"
22
23static const float
24one = 1.0,
25huge = 1.0e+30,
26tiny = 1.0e-30,

--- 6 unchanged lines hidden (view full) ---

33Q2 = 1.5873016091e-03, /* 0x3ad00d01 */
34Q3 = -7.9365076090e-05, /* 0xb8a670cd */
35Q4 = 4.0082177293e-06, /* 0x36867e54 */
36Q5 = -2.0109921195e-07; /* 0xb457edbb */
37
38float
39expm1f(float x)
40{
18
19#include "math.h"
20#include "math_private.h"
21
22static const float
23one = 1.0,
24huge = 1.0e+30,
25tiny = 1.0e-30,

--- 6 unchanged lines hidden (view full) ---

32Q2 = 1.5873016091e-03, /* 0x3ad00d01 */
33Q3 = -7.9365076090e-05, /* 0xb8a670cd */
34Q4 = 4.0082177293e-06, /* 0x36867e54 */
35Q5 = -2.0109921195e-07; /* 0xb457edbb */
36
37float
38expm1f(float x)
39{
41 float y,hi,lo,c,t,e,hxs,hfx,r1;
40 float y,hi,lo,c,t,e,hxs,hfx,r1,twopk;
42 int32_t k,xsb;
43 u_int32_t hx;
44
45 GET_FLOAT_WORD(hx,x);
46 xsb = hx&0x80000000; /* sign bit of x */
47 if(xsb==0) y=x; else y= -x; /* y = |x| */
48 hx &= 0x7fffffff; /* high word of |x| */
49

--- 37 unchanged lines hidden (view full) ---

87 /* x is now in primary range */
88 hfx = (float)0.5*x;
89 hxs = x*hfx;
90 r1 = one+hxs*(Q1+hxs*(Q2+hxs*(Q3+hxs*(Q4+hxs*Q5))));
91 t = (float)3.0-r1*hfx;
92 e = hxs*((r1-t)/((float)6.0 - x*t));
93 if(k==0) return x - (x*e-hxs); /* c is 0 */
94 else {
41 int32_t k,xsb;
42 u_int32_t hx;
43
44 GET_FLOAT_WORD(hx,x);
45 xsb = hx&0x80000000; /* sign bit of x */
46 if(xsb==0) y=x; else y= -x; /* y = |x| */
47 hx &= 0x7fffffff; /* high word of |x| */
48

--- 37 unchanged lines hidden (view full) ---

86 /* x is now in primary range */
87 hfx = (float)0.5*x;
88 hxs = x*hfx;
89 r1 = one+hxs*(Q1+hxs*(Q2+hxs*(Q3+hxs*(Q4+hxs*Q5))));
90 t = (float)3.0-r1*hfx;
91 e = hxs*((r1-t)/((float)6.0 - x*t));
92 if(k==0) return x - (x*e-hxs); /* c is 0 */
93 else {
94 SET_FLOAT_WORD(twopk,0x3f800000+(k<<23)); /* 2^k */
95 e = (x*(e-c)-c);
96 e -= hxs;
97 if(k== -1) return (float)0.5*(x-e)-(float)0.5;
98 if(k==1)
99 if(x < (float)-0.25) return -(float)2.0*(e-(x+(float)0.5));
100 else return one+(float)2.0*(x-e);
101 if (k <= -2 || k>56) { /* suffice to return exp(x)-1 */
95 e = (x*(e-c)-c);
96 e -= hxs;
97 if(k== -1) return (float)0.5*(x-e)-(float)0.5;
98 if(k==1)
99 if(x < (float)-0.25) return -(float)2.0*(e-(x+(float)0.5));
100 else return one+(float)2.0*(x-e);
101 if (k <= -2 || k>56) { /* suffice to return exp(x)-1 */
102 int32_t i;
103 y = one-(e-x);
102 y = one-(e-x);
104 GET_FLOAT_WORD(i,y);
105 SET_FLOAT_WORD(y,i+(k<<23)); /* add k to y's exponent */
103 if (k == 128) y = y*2.0F*0x1p127F;
104 else y = y*twopk;
106 return y-one;
107 }
108 t = one;
109 if(k<23) {
105 return y-one;
106 }
107 t = one;
108 if(k<23) {
110 int32_t i;
111 SET_FLOAT_WORD(t,0x3f800000 - (0x1000000>>k)); /* t=1-2^-k */
112 y = t-(e-x);
109 SET_FLOAT_WORD(t,0x3f800000 - (0x1000000>>k)); /* t=1-2^-k */
110 y = t-(e-x);
113 GET_FLOAT_WORD(i,y);
114 SET_FLOAT_WORD(y,i+(k<<23)); /* add k to y's exponent */
111 y = y*twopk;
115 } else {
112 } else {
116 int32_t i;
117 SET_FLOAT_WORD(t,((0x7f-k)<<23)); /* 2^-k */
118 y = x-(e+t);
119 y += one;
113 SET_FLOAT_WORD(t,((0x7f-k)<<23)); /* 2^-k */
114 y = x-(e+t);
115 y += one;
120 GET_FLOAT_WORD(i,y);
121 SET_FLOAT_WORD(y,i+(k<<23)); /* add k to y's exponent */
116 y = y*twopk;
122 }
123 }
124 return y;
125}
117 }
118 }
119 return y;
120}