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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=268587
@ -116,13 +116,13 @@ tiny = 1e-300,
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half= 5.00000000000000000000e-01, /* 0x3FE00000, 0x00000000 */
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one = 1.00000000000000000000e+00, /* 0x3FF00000, 0x00000000 */
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two = 2.00000000000000000000e+00, /* 0x40000000, 0x00000000 */
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/* c = (float)0.84506291151 */
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/* c = (float)0.84506291151 */
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erx = 8.45062911510467529297e-01, /* 0x3FEB0AC1, 0x60000000 */
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/*
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* Coefficients for approximation to erf on [0,0.84375]
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*/
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efx = 1.28379167095512586316e-01, /* 0x3FC06EBA, 0x8214DB69 */
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efx8= 1.02703333676410069053e+00, /* 0x3FF06EBA, 0x8214DB69 */
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/*
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* Coefficients for approximation to erf on [0,0.84375]
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*/
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pp0 = 1.28379167095512558561e-01, /* 0x3FC06EBA, 0x8214DB68 */
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pp1 = -3.25042107247001499370e-01, /* 0xBFD4CD7D, 0x691CB913 */
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pp2 = -2.84817495755985104766e-02, /* 0xBF9D2A51, 0xDBD7194F */
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@ -134,7 +134,7 @@ qq3 = 5.08130628187576562776e-03, /* 0x3F74D022, 0xC4D36B0F */
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qq4 = 1.32494738004321644526e-04, /* 0x3F215DC9, 0x221C1A10 */
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qq5 = -3.96022827877536812320e-06, /* 0xBED09C43, 0x42A26120 */
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/*
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* Coefficients for approximation to erf in [0.84375,1.25]
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* Coefficients for approximation to erf in [0.84375,1.25]
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*/
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pa0 = -2.36211856075265944077e-03, /* 0xBF6359B8, 0xBEF77538 */
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pa1 = 4.14856118683748331666e-01, /* 0x3FDA8D00, 0xAD92B34D */
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@ -150,7 +150,7 @@ qa4 = 1.26171219808761642112e-01, /* 0x3FC02660, 0xE763351F */
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qa5 = 1.36370839120290507362e-02, /* 0x3F8BEDC2, 0x6B51DD1C */
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qa6 = 1.19844998467991074170e-02, /* 0x3F888B54, 0x5735151D */
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/*
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* Coefficients for approximation to erfc in [1.25,1/0.35]
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* Coefficients for approximation to erfc in [1.25,1/0.35]
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*/
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ra0 = -9.86494403484714822705e-03, /* 0xBF843412, 0x600D6435 */
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ra1 = -6.93858572707181764372e-01, /* 0xBFE63416, 0xE4BA7360 */
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@ -169,7 +169,7 @@ sa6 = 1.08635005541779435134e+02, /* 0x405B28A3, 0xEE48AE2C */
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sa7 = 6.57024977031928170135e+00, /* 0x401A47EF, 0x8E484A93 */
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sa8 = -6.04244152148580987438e-02, /* 0xBFAEEFF2, 0xEE749A62 */
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/*
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* Coefficients for approximation to erfc in [1/.35,28]
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* Coefficients for approximation to erfc in [1/.35,28]
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*/
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rb0 = -9.86494292470009928597e-03, /* 0xBF843412, 0x39E86F4A */
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rb1 = -7.99283237680523006574e-01, /* 0xBFE993BA, 0x70C285DE */
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@ -222,15 +222,12 @@ erf(double x)
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x = fabs(x);
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s = one/(x*x);
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if(ix< 0x4006DB6E) { /* |x| < 1/0.35 */
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R=ra0+s*(ra1+s*(ra2+s*(ra3+s*(ra4+s*(
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ra5+s*(ra6+s*ra7))))));
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S=one+s*(sa1+s*(sa2+s*(sa3+s*(sa4+s*(
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sa5+s*(sa6+s*(sa7+s*sa8)))))));
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R=ra0+s*(ra1+s*(ra2+s*(ra3+s*(ra4+s*(ra5+s*(ra6+s*ra7))))));
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S=one+s*(sa1+s*(sa2+s*(sa3+s*(sa4+s*(sa5+s*(sa6+s*(sa7+
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s*sa8)))))));
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} else { /* |x| >= 1/0.35 */
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R=rb0+s*(rb1+s*(rb2+s*(rb3+s*(rb4+s*(
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rb5+s*rb6)))));
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S=one+s*(sb1+s*(sb2+s*(sb3+s*(sb4+s*(
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sb5+s*(sb6+s*sb7))))));
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R=rb0+s*(rb1+s*(rb2+s*(rb3+s*(rb4+s*(rb5+s*rb6)))));
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S=one+s*(sb1+s*(sb2+s*(sb3+s*(sb4+s*(sb5+s*(sb6+s*sb7))))));
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}
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z = x;
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SET_LOW_WORD(z,0);
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@ -279,21 +276,17 @@ erfc(double x)
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x = fabs(x);
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s = one/(x*x);
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if(ix< 0x4006DB6D) { /* |x| < 1/.35 ~ 2.857143*/
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R=ra0+s*(ra1+s*(ra2+s*(ra3+s*(ra4+s*(
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ra5+s*(ra6+s*ra7))))));
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S=one+s*(sa1+s*(sa2+s*(sa3+s*(sa4+s*(
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sa5+s*(sa6+s*(sa7+s*sa8)))))));
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R=ra0+s*(ra1+s*(ra2+s*(ra3+s*(ra4+s*(ra5+s*(ra6+s*ra7))))));
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S=one+s*(sa1+s*(sa2+s*(sa3+s*(sa4+s*(sa5+s*(sa6+s*(sa7+
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s*sa8)))))));
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} else { /* |x| >= 1/.35 ~ 2.857143 */
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if(hx<0&&ix>=0x40180000) return two-tiny;/* x < -6 */
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R=rb0+s*(rb1+s*(rb2+s*(rb3+s*(rb4+s*(
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rb5+s*rb6)))));
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S=one+s*(sb1+s*(sb2+s*(sb3+s*(sb4+s*(
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sb5+s*(sb6+s*sb7))))));
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R=rb0+s*(rb1+s*(rb2+s*(rb3+s*(rb4+s*(rb5+s*rb6)))));
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S=one+s*(sb1+s*(sb2+s*(sb3+s*(sb4+s*(sb5+s*(sb6+s*sb7))))));
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}
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z = x;
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SET_LOW_WORD(z,0);
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r = __ieee754_exp(-z*z-0.5625)*
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__ieee754_exp((z-x)*(z+x)+R/S);
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r = __ieee754_exp(-z*z-0.5625)*__ieee754_exp((z-x)*(z+x)+R/S);
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if(hx>0) return r/x; else return two-r/x;
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} else {
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if(hx>0) return tiny*tiny; else return two-tiny;
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