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125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998-1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef jsmath_h___
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#define jsmath_h___
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namespace js {
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typedef double (*UnaryFunType)(double);
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class MathCache
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{
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static const unsigned SizeLog2 = 12;
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static const unsigned Size = 1 << SizeLog2;
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struct Entry { double in; UnaryFunType f; double out; };
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Entry table[Size];
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public:
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MathCache();
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uintN hash(double x) {
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union { double d; struct { uint32_t one, two; } s; } u = { x };
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uint32_t hash32 = u.s.one ^ u.s.two;
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uint16_t hash16 = uint16_t(hash32 ^ (hash32 >> 16));
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return (hash16 & (Size - 1)) ^ (hash16 >> (16 - SizeLog2));
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}
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/*
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* N.B. lookup uses double-equality. This is only safe if hash() maps +0
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* and -0 to different table entries, which is asserted in MathCache().
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*/
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double lookup(UnaryFunType f, double x) {
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uintN index = hash(x);
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Entry &e = table[index];
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if (e.in == x && e.f == f)
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return e.out;
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e.in = x;
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e.f = f;
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return (e.out = f(x));
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}
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};
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} /* namespace js */
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/*
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* JS math functions.
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*/
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extern JSObject *
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js_InitMathClass(JSContext *cx, JSObject *obj);
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extern bool
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js_IsMathFunction(JSNative native);
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extern void
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js_InitRandom(JSContext *cx);
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extern JSBool
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js_math_abs(JSContext *cx, uintN argc, js::Value *vp);
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extern JSBool
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js_math_ceil(JSContext *cx, uintN argc, js::Value *vp);
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extern JSBool
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js_math_floor(JSContext *cx, uintN argc, js::Value *vp);
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extern JSBool
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js_math_max(JSContext *cx, uintN argc, js::Value *vp);
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extern JSBool
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js_math_min(JSContext *cx, uintN argc, js::Value *vp);
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extern JSBool
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js_math_round(JSContext *cx, uintN argc, js::Value *vp);
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extern JSBool
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js_math_sqrt(JSContext *cx, uintN argc, js::Value *vp);
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extern JSBool
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js_math_pow(JSContext *cx, uintN argc, js::Value *vp);
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extern jsdouble
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js_math_ceil_impl(jsdouble x);
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extern jsdouble
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js_math_floor_impl(jsdouble x);
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#endif /* jsmath_h___ */
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