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| author | Aaron Spike <aaron@ekips.org> | 2006-04-12 13:20:54 +0000 |
|---|---|---|
| committer | acspike <acspike@users.sourceforge.net> | 2006-04-12 13:20:54 +0000 |
| commit | ddfaffe08d23e4663fe759d67ae33fd67fc9ce5b (patch) | |
| tree | 234f5425a7ef7058e69dc2ab77f89810e4f3ed91 /src/dom/js/fdlibm/e_hypot.c | |
| parent | fix 1466070 (diff) | |
| download | inkscape-ddfaffe08d23e4663fe759d67ae33fd67fc9ce5b.tar.gz inkscape-ddfaffe08d23e4663fe759d67ae33fd67fc9ce5b.zip | |
Removed file/folder for ishmal
(bzr r478)
Diffstat (limited to 'src/dom/js/fdlibm/e_hypot.c')
| -rw-r--r-- | src/dom/js/fdlibm/e_hypot.c | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/src/dom/js/fdlibm/e_hypot.c b/src/dom/js/fdlibm/e_hypot.c deleted file mode 100644 index 390023087..000000000 --- a/src/dom/js/fdlibm/e_hypot.c +++ /dev/null @@ -1,173 +0,0 @@ -/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- - * - * ***** BEGIN LICENSE BLOCK ***** - * Version: MPL 1.1/GPL 2.0/LGPL 2.1 - * - * The contents of this file are subject to the Mozilla Public License Version - * 1.1 (the "License"); you may not use this file except in compliance with - * the License. You may obtain a copy of the License at - * http://www.mozilla.org/MPL/ - * - * Software distributed under the License is distributed on an "AS IS" basis, - * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License - * for the specific language governing rights and limitations under the - * License. - * - * The Original Code is Mozilla Communicator client code, released - * March 31, 1998. - * - * The Initial Developer of the Original Code is - * Sun Microsystems, Inc. - * Portions created by the Initial Developer are Copyright (C) 1998 - * the Initial Developer. All Rights Reserved. - * - * Contributor(s): - * - * Alternatively, the contents of this file may be used under the terms of - * either of the GNU General Public License Version 2 or later (the "GPL"), - * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), - * in which case the provisions of the GPL or the LGPL are applicable instead - * of those above. If you wish to allow use of your version of this file only - * under the terms of either the GPL or the LGPL, and not to allow others to - * use your version of this file under the terms of the MPL, indicate your - * decision by deleting the provisions above and replace them with the notice - * and other provisions required by the GPL or the LGPL. If you do not delete - * the provisions above, a recipient may use your version of this file under - * the terms of any one of the MPL, the GPL or the LGPL. - * - * ***** END LICENSE BLOCK ***** */ - -/* @(#)e_hypot.c 1.3 95/01/18 */ -/* - * ==================================================== - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. - * - * Developed at SunSoft, a Sun Microsystems, Inc. business. - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - */ - -/* __ieee754_hypot(x,y) - * - * Method : - * If (assume round-to-nearest) z=x*x+y*y - * has error less than sqrt(2)/2 ulp, than - * sqrt(z) has error less than 1 ulp (exercise). - * - * So, compute sqrt(x*x+y*y) with some care as - * follows to get the error below 1 ulp: - * - * Assume x>y>0; - * (if possible, set rounding to round-to-nearest) - * 1. if x > 2y use - * x1*x1+(y*y+(x2*(x+x1))) for x*x+y*y - * where x1 = x with lower 32 bits cleared, x2 = x-x1; else - * 2. if x <= 2y use - * t1*y1+((x-y)*(x-y)+(t1*y2+t2*y)) - * where t1 = 2x with lower 32 bits cleared, t2 = 2x-t1, - * y1= y with lower 32 bits chopped, y2 = y-y1. - * - * NOTE: scaling may be necessary if some argument is too - * large or too tiny - * - * Special cases: - * hypot(x,y) is INF if x or y is +INF or -INF; else - * hypot(x,y) is NAN if x or y is NAN. - * - * Accuracy: - * hypot(x,y) returns sqrt(x^2+y^2) with error less - * than 1 ulps (units in the last place) - */ - -#include "fdlibm.h" - -#ifdef __STDC__ - double __ieee754_hypot(double x, double y) -#else - double __ieee754_hypot(x,y) - double x, y; -#endif -{ - fd_twoints ux, uy; - double a=x,b=y,t1,t2,y1,y2,w; - int j,k,ha,hb; - - ux.d = x; uy.d = y; - ha = __HI(ux)&0x7fffffff; /* high word of x */ - hb = __HI(uy)&0x7fffffff; /* high word of y */ - if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;} - ux.d = a; uy.d = b; - __HI(ux) = ha; /* a <- |a| */ - __HI(uy) = hb; /* b <- |b| */ - a = ux.d; b = uy.d; - if((ha-hb)>0x3c00000) {return a+b;} /* x/y > 2**60 */ - k=0; - if(ha > 0x5f300000) { /* a>2**500 */ - if(ha >= 0x7ff00000) { /* Inf or NaN */ - w = a+b; /* for sNaN */ - ux.d = a; uy.d = b; - if(((ha&0xfffff)|__LO(ux))==0) w = a; - if(((hb^0x7ff00000)|__LO(uy))==0) w = b; - return w; - } - /* scale a and b by 2**-600 */ - ha -= 0x25800000; hb -= 0x25800000; k += 600; - ux.d = a; uy.d = b; - __HI(ux) = ha; - __HI(uy) = hb; - a = ux.d; b = uy.d; - } - if(hb < 0x20b00000) { /* b < 2**-500 */ - if(hb <= 0x000fffff) { /* subnormal b or 0 */ - uy.d = b; - if((hb|(__LO(uy)))==0) return a; - t1=0; - ux.d = t1; - __HI(ux) = 0x7fd00000; /* t1=2^1022 */ - t1 = ux.d; - b *= t1; - a *= t1; - k -= 1022; - } else { /* scale a and b by 2^600 */ - ha += 0x25800000; /* a *= 2^600 */ - hb += 0x25800000; /* b *= 2^600 */ - k -= 600; - ux.d = a; uy.d = b; - __HI(ux) = ha; - __HI(uy) = hb; - a = ux.d; b = uy.d; - } - } - /* medium size a and b */ - w = a-b; - if (w>b) { - t1 = 0; - ux.d = t1; - __HI(ux) = ha; - t1 = ux.d; - t2 = a-t1; - w = fd_sqrt(t1*t1-(b*(-b)-t2*(a+t1))); - } else { - a = a+a; - y1 = 0; - ux.d = y1; - __HI(ux) = hb; - y1 = ux.d; - y2 = b - y1; - t1 = 0; - ux.d = t1; - __HI(ux) = ha+0x00100000; - t1 = ux.d; - t2 = a - t1; - w = fd_sqrt(t1*y1-(w*(-w)-(t1*y2+t2*b))); - } - if(k!=0) { - t1 = 1.0; - ux.d = t1; - __HI(ux) += (k<<20); - t1 = ux.d; - return t1*w; - } else return w; -} |
