From f143458223f90262a9c2d929f9e815a74e3aa139 Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Sun, 16 Dec 2012 19:49:55 +0100 Subject: math: sinh.c cleanup similar to the cosh one comments are kept in the double version of the function --- src/math/sinhf.c | 66 +++++++++++++++++--------------------------------------- 1 file changed, 20 insertions(+), 46 deletions(-) (limited to 'src/math/sinhf.c') diff --git a/src/math/sinhf.c b/src/math/sinhf.c index b8d88224..6ad19ea2 100644 --- a/src/math/sinhf.c +++ b/src/math/sinhf.c @@ -1,57 +1,31 @@ -/* origin: FreeBSD /usr/src/lib/msun/src/e_sinhf.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 huge = 1.0e37; - float sinhf(float x) { - float t, h; - int32_t ix, jx; - - GET_FLOAT_WORD(jx, x); - ix = jx & 0x7fffffff; - - /* x is INF or NaN */ - if (ix >= 0x7f800000) - return x + x; + union {float f; uint32_t i;} u = {.f = x}; + uint32_t w; + float t, h, absx; h = 0.5; - if (jx < 0) + if (u.i >> 31) h = -h; - /* |x| in [0,9], return sign(x)*0.5*(E+E/(E+1))) */ - if (ix < 0x41100000) { /* |x|<9 */ - if (ix < 0x39800000) /* |x|<2**-12 */ - /* raise inexact, return x */ - if (huge+x > 1.0f) + /* |x| */ + u.i &= 0x7fffffff; + absx = u.f; + w = u.i; + + /* |x| < log(FLT_MAX) */ + if (w < 0x42b17217) { + t = expm1f(absx); + if (w < 0x3f800000) { + if (w < 0x3f800000 - (12<<23)) return x; - t = expm1f(fabsf(x)); - if (ix < 0x3f800000) - return h*(2.0f*t - t*t/(t+1.0f)); - return h*(t + t/(t+1.0f)); + return h*(2*t - t*t/(t+1)); + } + return h*(t + t/(t+1)); } - /* |x| in [9, logf(maxfloat)] return 0.5*exp(|x|) */ - if (ix < 0x42b17217) - return h*expf(fabsf(x)); - - /* |x| in [logf(maxfloat), overflowthresold] */ - if (ix <= 0x42b2d4fc) - return h * 2.0f * __expo2f(fabsf(x)); /* h is for sign only */ - - /* |x| > overflowthresold, sinh(x) overflow */ - return x*huge; + /* |x| > logf(FLT_MAX) or nan */ + t = 2*h*__expo2f(absx); + return t; } -- cgit v1.2.1