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annotate nspr/pr/include/prbit.h @ 3:150b72113545

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Add DBM and legacydb support
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:32:02 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 #ifndef prbit_h___
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7 #define prbit_h___
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8
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9 #include "prtypes.h"
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10 PR_BEGIN_EXTERN_C
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11
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12 /*
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13 ** Replace compare/jump/add/shift sequence with compiler built-in/intrinsic
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14 ** functions.
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15 */
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16 #if defined(_WIN32) && (_MSC_VER >= 1300) && \
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17 (defined(_M_IX86) || defined(_M_AMD64) || defined(_M_ARM))
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18 unsigned char _BitScanForward(unsigned long * Index, unsigned long Mask);
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19 unsigned char _BitScanReverse(unsigned long * Index, unsigned long Mask);
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20 # pragma intrinsic(_BitScanForward,_BitScanReverse)
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21 __forceinline static int __prBitScanForward32(unsigned int val)
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22 {
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23 unsigned long idx;
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24 _BitScanForward(&idx, (unsigned long)val);
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25 return( (int)idx );
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26 }
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27 __forceinline static int __prBitScanReverse32(unsigned int val)
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28 {
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29 unsigned long idx;
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30 _BitScanReverse(&idx, (unsigned long)val);
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31 return( (int)(31-idx) );
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32 }
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33 # define pr_bitscan_ctz32(val) __prBitScanForward32(val)
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34 # define pr_bitscan_clz32(val) __prBitScanReverse32(val)
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35 # define PR_HAVE_BUILTIN_BITSCAN32
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36 #elif ((__GNUC__ >= 4) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)) && \
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37 (defined(__i386__) || defined(__x86_64__) || defined(__arm__))
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38 # define pr_bitscan_ctz32(val) __builtin_ctz(val)
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39 # define pr_bitscan_clz32(val) __builtin_clz(val)
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40 # define PR_HAVE_BUILTIN_BITSCAN32
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41 #endif /* MSVC || GCC */
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42
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43 /*
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44 ** A prbitmap_t is a long integer that can be used for bitmaps
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45 */
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46 typedef unsigned long prbitmap_t;
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47
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48 #define PR_TEST_BIT(_map,_bit) \
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49 ((_map)[(_bit)>>PR_BITS_PER_LONG_LOG2] & (1L << ((_bit) & (PR_BITS_PER_LONG-1))))
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50 #define PR_SET_BIT(_map,_bit) \
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51 ((_map)[(_bit)>>PR_BITS_PER_LONG_LOG2] |= (1L << ((_bit) & (PR_BITS_PER_LONG-1))))
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52 #define PR_CLEAR_BIT(_map,_bit) \
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53 ((_map)[(_bit)>>PR_BITS_PER_LONG_LOG2] &= ~(1L << ((_bit) & (PR_BITS_PER_LONG-1))))
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54
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55 /*
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56 ** Compute the log of the least power of 2 greater than or equal to n
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57 */
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58 NSPR_API(PRIntn) PR_CeilingLog2(PRUint32 i);
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59
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60 /*
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61 ** Compute the log of the greatest power of 2 less than or equal to n
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62 */
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63 NSPR_API(PRIntn) PR_FloorLog2(PRUint32 i);
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64
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65 /*
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66 ** Macro version of PR_CeilingLog2: Compute the log of the least power of
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67 ** 2 greater than or equal to _n. The result is returned in _log2.
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68 */
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69 #ifdef PR_HAVE_BUILTIN_BITSCAN32
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70 #define PR_CEILING_LOG2(_log2,_n) \
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71 PR_BEGIN_MACRO \
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72 PRUint32 j_ = (PRUint32)(_n); \
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73 (_log2) = (j_ <= 1 ? 0 : 32 - pr_bitscan_clz32(j_ - 1)); \
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74 PR_END_MACRO
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75 #else
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76 #define PR_CEILING_LOG2(_log2,_n) \
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77 PR_BEGIN_MACRO \
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78 PRUint32 j_ = (PRUint32)(_n); \
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79 (_log2) = 0; \
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80 if ((j_) & ((j_)-1)) \
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81 (_log2) += 1; \
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82 if ((j_) >> 16) \
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83 (_log2) += 16, (j_) >>= 16; \
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84 if ((j_) >> 8) \
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85 (_log2) += 8, (j_) >>= 8; \
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86 if ((j_) >> 4) \
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87 (_log2) += 4, (j_) >>= 4; \
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88 if ((j_) >> 2) \
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89 (_log2) += 2, (j_) >>= 2; \
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90 if ((j_) >> 1) \
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91 (_log2) += 1; \
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92 PR_END_MACRO
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93 #endif /* PR_HAVE_BUILTIN_BITSCAN32 */
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94
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95 /*
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96 ** Macro version of PR_FloorLog2: Compute the log of the greatest power of
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97 ** 2 less than or equal to _n. The result is returned in _log2.
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98 **
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99 ** This is equivalent to finding the highest set bit in the word.
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100 */
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101 #ifdef PR_HAVE_BUILTIN_BITSCAN32
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102 #define PR_FLOOR_LOG2(_log2,_n) \
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103 PR_BEGIN_MACRO \
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104 PRUint32 j_ = (PRUint32)(_n); \
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105 (_log2) = 31 - pr_bitscan_clz32((j_) | 1); \
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106 PR_END_MACRO
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107 #else
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108 #define PR_FLOOR_LOG2(_log2,_n) \
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109 PR_BEGIN_MACRO \
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110 PRUint32 j_ = (PRUint32)(_n); \
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111 (_log2) = 0; \
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112 if ((j_) >> 16) \
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113 (_log2) += 16, (j_) >>= 16; \
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114 if ((j_) >> 8) \
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115 (_log2) += 8, (j_) >>= 8; \
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116 if ((j_) >> 4) \
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117 (_log2) += 4, (j_) >>= 4; \
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118 if ((j_) >> 2) \
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119 (_log2) += 2, (j_) >>= 2; \
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120 if ((j_) >> 1) \
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121 (_log2) += 1; \
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122 PR_END_MACRO
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123 #endif /* PR_HAVE_BUILTIN_BITSCAN32 */
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124
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125 /*
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126 ** Macros for rotate left and right. The argument 'a' must be an unsigned
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127 ** 32-bit integer type such as PRUint32.
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128 **
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129 ** There is no rotate operation in the C Language, so the construct
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130 ** (a << 4) | (a >> 28) is frequently used instead. Most compilers convert
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131 ** this to a rotate instruction, but MSVC doesn't without a little help.
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132 ** To get MSVC to generate a rotate instruction, we have to use the _rotl
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133 ** or _rotr intrinsic and use a pragma to make it inline.
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134 **
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135 ** Note: MSVC in VS2005 will do an inline rotate instruction on the above
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136 ** construct.
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137 */
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138
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139 #if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_AMD64) || \
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140 defined(_M_X64) || defined(_M_ARM))
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141 #include <stdlib.h>
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142 #pragma intrinsic(_rotl, _rotr)
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143 #define PR_ROTATE_LEFT32(a, bits) _rotl(a, bits)
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144 #define PR_ROTATE_RIGHT32(a, bits) _rotr(a, bits)
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145 #else
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146 #define PR_ROTATE_LEFT32(a, bits) (((a) << (bits)) | ((a) >> (32 - (bits))))
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147 #define PR_ROTATE_RIGHT32(a, bits) (((a) >> (bits)) | ((a) << (32 - (bits))))
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148 #endif
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149
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150 PR_END_EXTERN_C
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151 #endif /* prbit_h___ */
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