author | William Roberts <williamr@symbian.org> |
Thu, 22 Jul 2010 16:48:56 +0100 | |
branch | GCC_SURGE |
changeset 45 | 4b03adbd26ca |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
0
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/*-------------------------------------------------------------------- |
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*© Portions copyright (c) 2006 Nokia Corporation. All rights reserved. |
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*-------------------------------------------------------------------- |
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*/ |
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/* @(#)e_pow.c 1.5 04/04/22 SMI */ |
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/* |
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* ==================================================== |
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* Copyright (C) 2004 by Sun Microsystems, Inc. All rights reserved. |
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* |
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* Permission to use, copy, modify, and distribute this |
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* software is freely granted, provided that this notice |
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* is preserved. |
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* ==================================================== |
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*/ |
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#ifndef __SYMBIAN32__ |
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#ifndef lint |
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static char rcsid[] = "$FreeBSD: src/lib/msun/src/e_pow.c,v 1.11 2005/02/04 18:26:06 das Exp $"; |
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#endif |
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#endif //__SYMBIAN32__ |
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|
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/* __ieee754_pow(x,y) return x**y |
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* |
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* n |
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* Method: Let x = 2 * (1+f) |
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* 1. Compute and return log2(x) in two pieces: |
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* log2(x) = w1 + w2, |
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* where w1 has 53-24 = 29 bit trailing zeros. |
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* 2. Perform y*log2(x) = n+y' by simulating muti-precision |
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* arithmetic, where |y'|<=0.5. |
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* 3. Return x**y = 2**n*exp(y'*log2) |
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* |
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* Special cases: |
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* 1. (anything) ** 0 is 1 |
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* 2. (anything) ** 1 is itself |
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* 3. (anything) ** NAN is NAN |
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* 4. NAN ** (anything except 0) is NAN |
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* 5. +-(|x| > 1) ** +INF is +INF |
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* 6. +-(|x| > 1) ** -INF is +0 |
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* 7. +-(|x| < 1) ** +INF is +0 |
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* 8. +-(|x| < 1) ** -INF is +INF |
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* 9. +-1 ** +-INF is NAN |
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* 10. +0 ** (+anything except 0, NAN) is +0 |
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* 11. -0 ** (+anything except 0, NAN, odd integer) is +0 |
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* 12. +0 ** (-anything except 0, NAN) is +INF |
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* 13. -0 ** (-anything except 0, NAN, odd integer) is +INF |
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* 14. -0 ** (odd integer) = -( +0 ** (odd integer) ) |
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* 15. +INF ** (+anything except 0,NAN) is +INF |
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* 16. +INF ** (-anything except 0,NAN) is +0 |
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* 17. -INF ** (anything) = -0 ** (-anything) |
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* 18. (-anything) ** (integer) is (-1)**(integer)*(+anything**integer) |
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* 19. (-anything except 0 and inf) ** (non-integer) is NAN |
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* |
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* Accuracy: |
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* pow(x,y) returns x**y nearly rounded. In particular |
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* pow(integer,integer) |
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* always returns the correct integer provided it is |
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* representable. |
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* |
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* Constants : |
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* The hexadecimal values are the intended ones for the following |
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* constants. The decimal values may be used, provided that the |
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* compiler will convert from decimal to binary accurately enough |
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* to produce the hexadecimal values shown. |
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*/ |
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|
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#include <math.h> |
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#include "math_private.h" |
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|
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static const double |
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bp[] = {1.0, 1.5,}, |
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dp_h[] = { 0.0, 5.84962487220764160156e-01,}, /* 0x3FE2B803, 0x40000000 */ |
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dp_l[] = { 0.0, 1.35003920212974897128e-08,}, /* 0x3E4CFDEB, 0x43CFD006 */ |
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zero = 0.0, |
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one = 1.0, |
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two = 2.0, |
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two53 = 9007199254740992.0, /* 0x43400000, 0x00000000 */ |
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huge = 1.0e300, |
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tiny = 1.0e-300, |
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/* poly coefs for (3/2)*(log(x)-2s-2/3*s**3 */ |
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L1 = 5.99999999999994648725e-01, /* 0x3FE33333, 0x33333303 */ |
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L2 = 4.28571428578550184252e-01, /* 0x3FDB6DB6, 0xDB6FABFF */ |
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L3 = 3.33333329818377432918e-01, /* 0x3FD55555, 0x518F264D */ |
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L4 = 2.72728123808534006489e-01, /* 0x3FD17460, 0xA91D4101 */ |
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L5 = 2.30660745775561754067e-01, /* 0x3FCD864A, 0x93C9DB65 */ |
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L6 = 2.06975017800338417784e-01, /* 0x3FCA7E28, 0x4A454EEF */ |
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P1 = 1.66666666666666019037e-01, /* 0x3FC55555, 0x5555553E */ |
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P2 = -2.77777777770155933842e-03, /* 0xBF66C16C, 0x16BEBD93 */ |
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P3 = 6.61375632143793436117e-05, /* 0x3F11566A, 0xAF25DE2C */ |
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P4 = -1.65339022054652515390e-06, /* 0xBEBBBD41, 0xC5D26BF1 */ |
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P5 = 4.13813679705723846039e-08, /* 0x3E663769, 0x72BEA4D0 */ |
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lg2 = 6.93147180559945286227e-01, /* 0x3FE62E42, 0xFEFA39EF */ |
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lg2_h = 6.93147182464599609375e-01, /* 0x3FE62E43, 0x00000000 */ |
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lg2_l = -1.90465429995776804525e-09, /* 0xBE205C61, 0x0CA86C39 */ |
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ovt = 8.0085662595372944372e-0017, /* -(1024-log2(ovfl+.5ulp)) */ |
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cp = 9.61796693925975554329e-01, /* 0x3FEEC709, 0xDC3A03FD =2/(3ln2) */ |
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96 |
cp_h = 9.61796700954437255859e-01, /* 0x3FEEC709, 0xE0000000 =(float)cp */ |
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97 |
cp_l = -7.02846165095275826516e-09, /* 0xBE3E2FE0, 0x145B01F5 =tail of cp_h*/ |
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98 |
ivln2 = 1.44269504088896338700e+00, /* 0x3FF71547, 0x652B82FE =1/ln2 */ |
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99 |
ivln2_h = 1.44269502162933349609e+00, /* 0x3FF71547, 0x60000000 =24b 1/ln2*/ |
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100 |
ivln2_l = 1.92596299112661746887e-08; /* 0x3E54AE0B, 0xF85DDF44 =1/ln2 tail*/ |
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101 |
|
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102 |
EXPORT_C double __ieee754_pow(double x, double y) |
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103 |
{ |
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104 |
double z,ax,z_h,z_l,p_h,p_l; |
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105 |
double y1,t1,t2,r,s,t,u,v,w; |
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106 |
int32_t i,j,k,yisint,n; |
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107 |
int32_t hx,hy,ix,iy; |
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108 |
u_int32_t lx,ly; |
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109 |
#ifdef __SYMBIAN32__ |
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u_int32_t xval; |
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#endif //__SYMBIAN32__ |
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112 |
|
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113 |
EXTRACT_WORDS(hx,lx,x); |
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EXTRACT_WORDS(hy,ly,y); |
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ix = hx&0x7fffffff; iy = hy&0x7fffffff; |
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116 |
|
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117 |
/* y==zero: x**0 = 1 */ |
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118 |
if((iy|ly)==0) return one; |
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119 |
|
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120 |
#ifdef __SYMBIAN32__ |
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121 |
/* x==-1.0and Y = NAN; return NAN */ |
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xval = (hx&0xffffffff)^0xbff00000 ; |
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123 |
if( (xval== 0) && lx==0 && (iy > 0x7ff00000 || ((iy==0x7ff00000)&&(ly!=0)) )) |
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124 |
return y; |
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125 |
/* x==1.0: return x */ |
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126 |
if(lx == 0 && (((hx&0x7fffffff)^0x3ff00000) == 0) ) return one; |
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#endif //__SYMBIAN32__ |
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128 |
/* +-NaN return x+y */ |
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129 |
if(ix > 0x7ff00000 || ((ix==0x7ff00000)&&(lx!=0)) || |
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130 |
iy > 0x7ff00000 || ((iy==0x7ff00000)&&(ly!=0))) |
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131 |
return x+y; |
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132 |
|
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133 |
/* determine if y is an odd int when x < 0 |
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* yisint = 0 ... y is not an integer |
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* yisint = 1 ... y is an odd int |
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* yisint = 2 ... y is an even int |
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137 |
*/ |
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138 |
yisint = 0; |
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139 |
if(hx<0) { |
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if(iy>=0x43400000) yisint = 2; /* even integer y */ |
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141 |
else if(iy>=0x3ff00000) { |
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142 |
k = (iy>>20)-0x3ff; /* exponent */ |
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143 |
if(k>20) { |
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144 |
j = ly>>(52-k); |
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145 |
if((j<<(52-k))==ly) yisint = 2-(j&1); |
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146 |
} else if(ly==0) { |
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j = iy>>(20-k); |
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148 |
if((j<<(20-k))==iy) yisint = 2-(j&1); |
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149 |
} |
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150 |
} |
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151 |
} |
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152 |
|
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153 |
/* special value of y */ |
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154 |
if(ly==0) { |
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155 |
if (iy==0x7ff00000) { /* y is +-inf */ |
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156 |
if(((ix-0x3ff00000)|lx)==0) |
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157 |
return y - y; /* inf**+-1 is NaN */ |
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158 |
else if (ix >= 0x3ff00000)/* (|x|>1)**+-inf = inf,0 */ |
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159 |
return (hy>=0)? y: zero; |
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160 |
else /* (|x|<1)**-,+inf = inf,0 */ |
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161 |
return (hy<0)?-y: zero; |
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162 |
} |
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163 |
if(iy==0x3ff00000) { /* y is +-1 */ |
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164 |
if(hy<0) return one/x; else return x; |
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165 |
} |
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166 |
if(hy==0x40000000) return x*x; /* y is 2 */ |
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167 |
if(hy==0x3fe00000) { /* y is 0.5 */ |
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168 |
if(hx>=0) /* x >= +0 */ |
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169 |
return sqrt(x); |
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170 |
} |
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171 |
} |
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172 |
|
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173 |
ax = fabs(x); |
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174 |
/* special value of x */ |
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175 |
if(lx==0) { |
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176 |
if(ix==0x7ff00000||ix==0||ix==0x3ff00000){ |
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177 |
z = ax; /*x is +-0,+-inf,+-1*/ |
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178 |
if(hy<0) z = one/z; /* z = (1/|x|) */ |
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179 |
if(hx<0) { |
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180 |
if(((ix-0x3ff00000)|yisint)==0) { |
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181 |
z = (z-z)/(z-z); /* (-1)**non-int is NaN */ |
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182 |
} else if(yisint==1) |
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183 |
z = -z; /* (x<0)**odd = -(|x|**odd) */ |
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184 |
} |
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185 |
return z; |
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186 |
} |
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187 |
} |
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188 |
|
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189 |
/* CYGNUS LOCAL + fdlibm-5.3 fix: This used to be |
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190 |
n = (hx>>31)+1; |
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191 |
but ANSI C says a right shift of a signed negative quantity is |
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192 |
implementation defined. */ |
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193 |
n = ((u_int32_t)hx>>31)-1; |
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194 |
|
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195 |
/* (x<0)**(non-int) is NaN */ |
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196 |
if((n|yisint)==0) return (x-x)/(x-x); |
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197 |
|
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198 |
s = one; /* s (sign of result -ve**odd) = -1 else = 1 */ |
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199 |
if((n|(yisint-1))==0) s = -one;/* (-ve)**(odd int) */ |
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200 |
|
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201 |
/* |y| is huge */ |
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202 |
if(iy>0x41e00000) { /* if |y| > 2**31 */ |
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203 |
if(iy>0x43f00000){ /* if |y| > 2**64, must o/uflow */ |
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if(ix<=0x3fefffff) return (hy<0)? huge*huge:tiny*tiny; |
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205 |
if(ix>=0x3ff00000) return (hy>0)? huge*huge:tiny*tiny; |
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206 |
} |
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207 |
/* over/underflow if x is not close to one */ |
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208 |
if(ix<0x3fefffff) return (hy<0)? s*huge*huge:s*tiny*tiny; |
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209 |
if(ix>0x3ff00000) return (hy>0)? s*huge*huge:s*tiny*tiny; |
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210 |
/* now |1-x| is tiny <= 2**-20, suffice to compute |
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211 |
log(x) by x-x^2/2+x^3/3-x^4/4 */ |
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t = ax-one; /* t has 20 trailing zeros */ |
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w = (t*t)*(0.5-t*(0.3333333333333333333333-t*0.25)); |
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u = ivln2_h*t; /* ivln2_h has 21 sig. bits */ |
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v = t*ivln2_l-w*ivln2; |
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t1 = u+v; |
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SET_LOW_WORD(t1,0); |
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t2 = v-(t1-u); |
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219 |
} else { |
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220 |
double ss,s2,s_h,s_l,t_h,t_l; |
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n = 0; |
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222 |
/* take care subnormal number */ |
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if(ix<0x00100000) |
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{ax *= two53; n -= 53; GET_HIGH_WORD(ix,ax); } |
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n += ((ix)>>20)-0x3ff; |
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j = ix&0x000fffff; |
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227 |
/* determine interval */ |
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ix = j|0x3ff00000; /* normalize ix */ |
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229 |
if(j<=0x3988E) k=0; /* |x|<sqrt(3/2) */ |
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else if(j<0xBB67A) k=1; /* |x|<sqrt(3) */ |
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else {k=0;n+=1;ix -= 0x00100000;} |
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SET_HIGH_WORD(ax,ix); |
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233 |
|
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234 |
/* compute ss = s_h+s_l = (x-1)/(x+1) or (x-1.5)/(x+1.5) */ |
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235 |
u = ax-bp[k]; /* bp[0]=1.0, bp[1]=1.5 */ |
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v = one/(ax+bp[k]); |
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ss = u*v; |
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s_h = ss; |
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SET_LOW_WORD(s_h,0); |
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/* t_h=ax+bp[k] High */ |
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t_h = zero; |
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242 |
SET_HIGH_WORD(t_h,((ix>>1)|0x20000000)+0x00080000+(k<<18)); |
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243 |
t_l = ax - (t_h-bp[k]); |
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s_l = v*((u-s_h*t_h)-s_h*t_l); |
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245 |
/* compute log(ax) */ |
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246 |
s2 = ss*ss; |
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r = s2*s2*(L1+s2*(L2+s2*(L3+s2*(L4+s2*(L5+s2*L6))))); |
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r += s_l*(s_h+ss); |
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249 |
s2 = s_h*s_h; |
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250 |
t_h = 3.0+s2+r; |
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251 |
SET_LOW_WORD(t_h,0); |
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252 |
t_l = r-((t_h-3.0)-s2); |
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253 |
/* u+v = ss*(1+...) */ |
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254 |
u = s_h*t_h; |
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255 |
v = s_l*t_h+t_l*ss; |
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256 |
/* 2/(3log2)*(ss+...) */ |
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257 |
p_h = u+v; |
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258 |
SET_LOW_WORD(p_h,0); |
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p_l = v-(p_h-u); |
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260 |
z_h = cp_h*p_h; /* cp_h+cp_l = 2/(3*log2) */ |
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z_l = cp_l*p_h+p_l*cp+dp_l[k]; |
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262 |
/* log2(ax) = (ss+..)*2/(3*log2) = n + dp_h + z_h + z_l */ |
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263 |
t = (double)n; |
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t1 = (((z_h+z_l)+dp_h[k])+t); |
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265 |
SET_LOW_WORD(t1,0); |
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t2 = z_l-(((t1-t)-dp_h[k])-z_h); |
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267 |
} |
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268 |
|
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269 |
/* split up y into y1+y2 and compute (y1+y2)*(t1+t2) */ |
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270 |
y1 = y; |
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271 |
SET_LOW_WORD(y1,0); |
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p_l = (y-y1)*t1+y*t2; |
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273 |
p_h = y1*t1; |
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274 |
z = p_l+p_h; |
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275 |
EXTRACT_WORDS(j,i,z); |
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276 |
if (j>=0x40900000) { /* z >= 1024 */ |
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277 |
if(((j-0x40900000)|i)!=0) /* if z > 1024 */ |
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278 |
return s*huge*huge; /* overflow */ |
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279 |
else { |
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280 |
if(p_l+ovt>z-p_h) return s*huge*huge; /* overflow */ |
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281 |
} |
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282 |
} else if((j&0x7fffffff)>=0x4090cc00 ) { /* z <= -1075 */ |
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283 |
if(((j-0xc090cc00)|i)!=0) /* z < -1075 */ |
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284 |
return s*tiny*tiny; /* underflow */ |
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285 |
else { |
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286 |
if(p_l<=z-p_h) return s*tiny*tiny; /* underflow */ |
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287 |
} |
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288 |
} |
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289 |
/* |
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* compute 2**(p_h+p_l) |
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*/ |
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i = j&0x7fffffff; |
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k = (i>>20)-0x3ff; |
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n = 0; |
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if(i>0x3fe00000) { /* if |z| > 0.5, set n = [z+0.5] */ |
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n = j+(0x00100000>>(k+1)); |
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k = ((n&0x7fffffff)>>20)-0x3ff; /* new k for n */ |
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t = zero; |
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SET_HIGH_WORD(t,n&~(0x000fffff>>k)); |
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n = ((n&0x000fffff)|0x00100000)>>(20-k); |
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if(j<0) n = -n; |
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p_h -= t; |
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} |
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t = p_l+p_h; |
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SET_LOW_WORD(t,0); |
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u = t*lg2_h; |
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v = (p_l-(t-p_h))*lg2+t*lg2_l; |
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z = u+v; |
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w = v-(z-u); |
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t = z*z; |
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t1 = z - t*(P1+t*(P2+t*(P3+t*(P4+t*P5)))); |
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r = (z*t1)/(t1-two)-(w+z*w); |
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z = one-(r-z); |
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GET_HIGH_WORD(j,z); |
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j += (n<<20); |
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if((j>>20)<=0) z = scalbn(z,n); /* subnormal output */ |
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else SET_HIGH_WORD(z,j); |
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return s*z; |
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} |