diff options
Diffstat (limited to 'lib/mlibc/options/ansi/musl-generic-math/expf.c')
-rw-r--r-- | lib/mlibc/options/ansi/musl-generic-math/expf.c | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/lib/mlibc/options/ansi/musl-generic-math/expf.c b/lib/mlibc/options/ansi/musl-generic-math/expf.c deleted file mode 100644 index feee2b0..0000000 --- a/lib/mlibc/options/ansi/musl-generic-math/expf.c +++ /dev/null @@ -1,83 +0,0 @@ -/* origin: FreeBSD /usr/src/lib/msun/src/e_expf.c */ -/* - * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. - */ -/* - * ==================================================== - * 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 -half[2] = {0.5,-0.5}, -ln2hi = 6.9314575195e-1f, /* 0x3f317200 */ -ln2lo = 1.4286067653e-6f, /* 0x35bfbe8e */ -invln2 = 1.4426950216e+0f, /* 0x3fb8aa3b */ -/* - * Domain [-0.34568, 0.34568], range ~[-4.278e-9, 4.447e-9]: - * |x*(exp(x)+1)/(exp(x)-1) - p(x)| < 2**-27.74 - */ -P1 = 1.6666625440e-1f, /* 0xaaaa8f.0p-26 */ -P2 = -2.7667332906e-3f; /* -0xb55215.0p-32 */ - -float expf(float x) -{ - float_t hi, lo, c, xx, y; - int k, sign; - uint32_t hx; - - GET_FLOAT_WORD(hx, x); - sign = hx >> 31; /* sign bit of x */ - hx &= 0x7fffffff; /* high word of |x| */ - - /* special cases */ - if (hx >= 0x42aeac50) { /* if |x| >= -87.33655f or NaN */ - if (hx > 0x7f800000) /* NaN */ - return x; - if (hx >= 0x42b17218 && !sign) { /* x >= 88.722839f */ - /* overflow */ - x *= 0x1p127f; - return x; - } - if (sign) { - /* underflow */ - FORCE_EVAL(-0x1p-149f/x); - if (hx >= 0x42cff1b5) /* x <= -103.972084f */ - return 0; - } - } - - /* argument reduction */ - if (hx > 0x3eb17218) { /* if |x| > 0.5 ln2 */ - if (hx > 0x3f851592) /* if |x| > 1.5 ln2 */ - k = invln2*x + half[sign]; - else - k = 1 - sign - sign; - hi = x - k*ln2hi; /* k*ln2hi is exact here */ - lo = k*ln2lo; - x = hi - lo; - } else if (hx > 0x39000000) { /* |x| > 2**-14 */ - k = 0; - hi = x; - lo = 0; - } else { - /* raise inexact */ - FORCE_EVAL(0x1p127f + x); - return 1 + x; - } - - /* x is now in primary range */ - xx = x*x; - c = x - xx*(P1+xx*P2); - y = 1 + (x*c/(2-c) - lo + hi); - if (k == 0) - return y; - return scalbnf(y, k); -} |