diff options
Diffstat (limited to 'lib/mlibc/options/ansi/musl-generic-math/log1pf.c')
-rw-r--r-- | lib/mlibc/options/ansi/musl-generic-math/log1pf.c | 77 |
1 files changed, 0 insertions, 77 deletions
diff --git a/lib/mlibc/options/ansi/musl-generic-math/log1pf.c b/lib/mlibc/options/ansi/musl-generic-math/log1pf.c deleted file mode 100644 index 23985c3..0000000 --- a/lib/mlibc/options/ansi/musl-generic-math/log1pf.c +++ /dev/null @@ -1,77 +0,0 @@ -/* origin: FreeBSD /usr/src/lib/msun/src/s_log1pf.c */ -/* - * ==================================================== - * 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 "libm.h" - -static const float -ln2_hi = 6.9313812256e-01, /* 0x3f317180 */ -ln2_lo = 9.0580006145e-06, /* 0x3717f7d1 */ -/* |(log(1+s)-log(1-s))/s - Lg(s)| < 2**-34.24 (~[-4.95e-11, 4.97e-11]). */ -Lg1 = 0xaaaaaa.0p-24, /* 0.66666662693 */ -Lg2 = 0xccce13.0p-25, /* 0.40000972152 */ -Lg3 = 0x91e9ee.0p-25, /* 0.28498786688 */ -Lg4 = 0xf89e26.0p-26; /* 0.24279078841 */ - -float log1pf(float x) -{ - union {float f; uint32_t i;} u = {x}; - float_t hfsq,f,c,s,z,R,w,t1,t2,dk; - uint32_t ix,iu; - int k; - - ix = u.i; - k = 1; - if (ix < 0x3ed413d0 || ix>>31) { /* 1+x < sqrt(2)+ */ - if (ix >= 0xbf800000) { /* x <= -1.0 */ - if (x == -1) - return x/0.0f; /* log1p(-1)=+inf */ - return (x-x)/0.0f; /* log1p(x<-1)=NaN */ - } - if (ix<<1 < 0x33800000<<1) { /* |x| < 2**-24 */ - /* underflow if subnormal */ - if ((ix&0x7f800000) == 0) - FORCE_EVAL(x*x); - return x; - } - if (ix <= 0xbe95f619) { /* sqrt(2)/2- <= 1+x < sqrt(2)+ */ - k = 0; - c = 0; - f = x; - } - } else if (ix >= 0x7f800000) - return x; - if (k) { - u.f = 1 + x; - iu = u.i; - iu += 0x3f800000 - 0x3f3504f3; - k = (int)(iu>>23) - 0x7f; - /* correction term ~ log(1+x)-log(u), avoid underflow in c/u */ - if (k < 25) { - c = k >= 2 ? 1-(u.f-x) : x-(u.f-1); - c /= u.f; - } else - c = 0; - /* reduce u into [sqrt(2)/2, sqrt(2)] */ - iu = (iu&0x007fffff) + 0x3f3504f3; - u.i = iu; - f = u.f - 1; - } - s = f/(2.0f + f); - z = s*s; - w = z*z; - t1= w*(Lg2+w*Lg4); - t2= z*(Lg1+w*Lg3); - R = t2 + t1; - hfsq = 0.5f*f*f; - dk = k; - return s*(hfsq+R) + (dk*ln2_lo+c) - hfsq + f + dk*ln2_hi; -} |