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Diffstat (limited to 'src/third_party/js-1.7/jsbit.h')
| -rw-r--r-- | src/third_party/js-1.7/jsbit.h | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/src/third_party/js-1.7/jsbit.h b/src/third_party/js-1.7/jsbit.h deleted file mode 100644 index 87bb0476a72..00000000000 --- a/src/third_party/js-1.7/jsbit.h +++ /dev/null @@ -1,195 +0,0 @@ -/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ -/* ***** 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 - * Netscape Communications Corporation. - * 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 ***** */ - -#ifndef jsbit_h___ -#define jsbit_h___ - -#include "jstypes.h" -#include "jsutil.h" - -JS_BEGIN_EXTERN_C - -/* -** A jsbitmap_t is a long integer that can be used for bitmaps -*/ -typedef JSUword jsbitmap_t; /* NSPR name, a la Unix system types */ -typedef jsbitmap_t jsbitmap; /* JS-style scalar typedef name */ - -#define JS_TEST_BIT(_map,_bit) \ - ((_map)[(_bit)>>JS_BITS_PER_WORD_LOG2] & (1L << ((_bit) & (JS_BITS_PER_WORD-1)))) -#define JS_SET_BIT(_map,_bit) \ - ((_map)[(_bit)>>JS_BITS_PER_WORD_LOG2] |= (1L << ((_bit) & (JS_BITS_PER_WORD-1)))) -#define JS_CLEAR_BIT(_map,_bit) \ - ((_map)[(_bit)>>JS_BITS_PER_WORD_LOG2] &= ~(1L << ((_bit) & (JS_BITS_PER_WORD-1)))) - -/* -** Compute the log of the least power of 2 greater than or equal to n -*/ -extern JS_PUBLIC_API(JSIntn) JS_CeilingLog2(JSUint32 i); - -/* -** Compute the log of the greatest power of 2 less than or equal to n -*/ -extern JS_PUBLIC_API(JSIntn) JS_FloorLog2(JSUint32 i); - -/* - * Check if __builtin_clz is available which apeared first in GCC 3.4. - * The built-in allows to speedup calculations of ceiling/floor log2, - * see bug 327129. - */ -#if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) -# define JS_HAS_GCC_BUILTIN_CLZ -#endif - -/* -** Macro version of JS_CeilingLog2: Compute the log of the least power of -** 2 greater than or equal to _n. The result is returned in _log2. -*/ -#ifdef JS_HAS_GCC_BUILTIN_CLZ -/* - * Use __builtin_clz or count-leading-zeros to calculate ceil(log2(_n)). - * The macro checks for "n <= 1" and not "n != 0" as __builtin_clz(0) is - * undefined. - */ -# define JS_CEILING_LOG2(_log2,_n) \ - JS_BEGIN_MACRO \ - JS_STATIC_ASSERT(sizeof(unsigned int) == sizeof(JSUint32)); \ - unsigned int j_ = (unsigned int)(_n); \ - (_log2) = (j_ <= 1 ? 0 : 32 - __builtin_clz(j_ - 1)); \ - JS_END_MACRO -#else -# define JS_CEILING_LOG2(_log2,_n) \ - JS_BEGIN_MACRO \ - JSUint32 j_ = (JSUint32)(_n); \ - (_log2) = 0; \ - if ((j_) & ((j_)-1)) \ - (_log2) += 1; \ - if ((j_) >> 16) \ - (_log2) += 16, (j_) >>= 16; \ - if ((j_) >> 8) \ - (_log2) += 8, (j_) >>= 8; \ - if ((j_) >> 4) \ - (_log2) += 4, (j_) >>= 4; \ - if ((j_) >> 2) \ - (_log2) += 2, (j_) >>= 2; \ - if ((j_) >> 1) \ - (_log2) += 1; \ - JS_END_MACRO -#endif - -/* -** Macro version of JS_FloorLog2: Compute the log of the greatest power of -** 2 less than or equal to _n. The result is returned in _log2. -** -** This is equivalent to finding the highest set bit in the word. -*/ -#if JS_GCC_HAS_BUILTIN_CLZ -/* - * Use __builtin_clz or count-leading-zeros to calculate floor(log2(_n)). - * Since __builtin_clz(0) is undefined, the macro set the loweset bit to 1 - * to ensure 0 result when _n == 0. - */ -# define JS_FLOOR_LOG2(_log2,_n) \ - JS_BEGIN_MACRO \ - JS_STATIC_ASSERT(sizeof(unsigned int) == sizeof(JSUint32)); \ - (_log2) = 31 - __builtin_clz(((unsigned int)(_n)) | 1); \ - JS_END_MACRO -#else -# define JS_FLOOR_LOG2(_log2,_n) \ - JS_BEGIN_MACRO \ - JSUint32 j_ = (JSUint32)(_n); \ - (_log2) = 0; \ - if ((j_) >> 16) \ - (_log2) += 16, (j_) >>= 16; \ - if ((j_) >> 8) \ - (_log2) += 8, (j_) >>= 8; \ - if ((j_) >> 4) \ - (_log2) += 4, (j_) >>= 4; \ - if ((j_) >> 2) \ - (_log2) += 2, (j_) >>= 2; \ - if ((j_) >> 1) \ - (_log2) += 1; \ - JS_END_MACRO -#endif - -/* - * Internal function. - * Compute the log of the least power of 2 greater than or equal to n. - * This is a version of JS_CeilingLog2 that operates on jsuword with - * CPU-dependant size. - */ -#define JS_CEILING_LOG2W(n) ((n) <= 1 ? 0 : 1 + JS_FLOOR_LOG2W((n) - 1)) - -/* - * Internal function. - * Compute the log of the greatest power of 2 less than or equal to n. - * This is a version of JS_FloorLog2 that operates on jsuword with - * CPU-dependant size and requires that n != 0. - */ -#define JS_FLOOR_LOG2W(n) (JS_ASSERT((n) != 0), js_FloorLog2wImpl(n)) - -#ifdef JS_HAS_GCC_BUILTIN_CLZ - -# if JS_BYTES_PER_WORD == 4 -JS_STATIC_ASSERT(sizeof(unsigned) == sizeof(JSUword)); -# define js_FloorLog2wImpl(n) \ - ((JSUword)(JS_BITS_PER_WORD - 1 - __builtin_clz(n))) -# elif JS_BYTES_PER_WORD == 8 -JS_STATIC_ASSERT(sizeof(unsigned long long) == sizeof(JSUword)); -# define js_FloorLog2wImpl(n) \ - ((JSUword)(JS_BITS_PER_WORD - 1 - __builtin_clzll(n))) -# else -# error "NOT SUPPORTED" -# endif - -#else - -# if JS_BYTES_PER_WORD == 4 -# define js_FloorLog2wImpl(n) ((JSUword)JS_FloorLog2(n)) -# elif JS_BYTES_PER_WORD == 8 -extern JSUword -js_FloorLog2wImpl(JSUword n); -# else -# error "NOT SUPPORTED" -# endif - -#endif - - -JS_END_EXTERN_C -#endif /* jsbit_h___ */ |