Mercurial > trustbridge > nss-cmake-static
annotate nspr/pr/src/misc/prlong.c @ 0:1e5118fa0cb1
This is NSS with a Cmake Buildsyste
To compile a static NSS library for Windows we've used the
Chromium-NSS fork and added a Cmake buildsystem to compile
it statically for Windows. See README.chromium for chromium
changes and README.trustbridge for our modifications.
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Mon, 28 Jul 2014 10:47:06 +0200 |
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rev | line source |
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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 #include "prlong.h" |
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7 |
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8 static PRInt64 ll_zero = LL_INIT( 0x00000000,0x00000000 ); |
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9 static PRInt64 ll_maxint = LL_INIT( 0x7fffffff, 0xffffffff ); |
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10 static PRInt64 ll_minint = LL_INIT( 0x80000000, 0x00000000 ); |
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11 static PRUint64 ll_maxuint = LL_INIT( 0xffffffff, 0xffffffff ); |
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12 |
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13 PR_IMPLEMENT(PRInt64) LL_Zero(void) { return ll_zero; } |
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14 PR_IMPLEMENT(PRInt64) LL_MaxInt(void) { return ll_maxint; } |
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15 PR_IMPLEMENT(PRInt64) LL_MinInt(void) { return ll_minint; } |
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16 PR_IMPLEMENT(PRUint64) LL_MaxUint(void) { return ll_maxuint; } |
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17 |
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18 #ifndef HAVE_LONG_LONG |
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19 /* |
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20 ** Divide 64-bit a by 32-bit b, which must be normalized so its high bit is 1. |
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21 */ |
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22 static void norm_udivmod32(PRUint32 *qp, PRUint32 *rp, PRUint64 a, PRUint32 b) |
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23 { |
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24 PRUint32 d1, d0, q1, q0; |
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25 PRUint32 r1, r0, m; |
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26 |
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27 d1 = _hi16(b); |
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28 d0 = _lo16(b); |
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29 r1 = a.hi % d1; |
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30 q1 = a.hi / d1; |
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31 m = q1 * d0; |
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32 r1 = (r1 << 16) | _hi16(a.lo); |
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33 if (r1 < m) { |
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34 q1--, r1 += b; |
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35 if (r1 >= b /* i.e., we didn't get a carry when adding to r1 */ |
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36 && r1 < m) { |
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37 q1--, r1 += b; |
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38 } |
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39 } |
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40 r1 -= m; |
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41 r0 = r1 % d1; |
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42 q0 = r1 / d1; |
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43 m = q0 * d0; |
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44 r0 = (r0 << 16) | _lo16(a.lo); |
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45 if (r0 < m) { |
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46 q0--, r0 += b; |
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47 if (r0 >= b |
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48 && r0 < m) { |
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49 q0--, r0 += b; |
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50 } |
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51 } |
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52 *qp = (q1 << 16) | q0; |
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53 *rp = r0 - m; |
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54 } |
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55 |
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56 static PRUint32 CountLeadingZeros(PRUint32 a) |
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57 { |
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58 PRUint32 t; |
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59 PRUint32 r = 32; |
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60 |
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61 if ((t = a >> 16) != 0) |
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62 r -= 16, a = t; |
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63 if ((t = a >> 8) != 0) |
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64 r -= 8, a = t; |
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65 if ((t = a >> 4) != 0) |
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66 r -= 4, a = t; |
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67 if ((t = a >> 2) != 0) |
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68 r -= 2, a = t; |
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69 if ((t = a >> 1) != 0) |
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70 r -= 1, a = t; |
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71 if (a & 1) |
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72 r--; |
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73 return r; |
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74 } |
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75 |
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76 PR_IMPLEMENT(void) ll_udivmod(PRUint64 *qp, PRUint64 *rp, PRUint64 a, PRUint64 b) |
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77 { |
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78 PRUint32 n0, n1, n2; |
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79 PRUint32 q0, q1; |
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80 PRUint32 rsh, lsh; |
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81 |
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82 n0 = a.lo; |
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83 n1 = a.hi; |
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84 |
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85 if (b.hi == 0) { |
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86 if (b.lo > n1) { |
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87 /* (0 q0) = (n1 n0) / (0 D0) */ |
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88 |
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89 lsh = CountLeadingZeros(b.lo); |
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90 |
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91 if (lsh) { |
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92 /* |
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93 * Normalize, i.e. make the most significant bit of the |
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94 * denominator be set. |
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95 */ |
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96 b.lo = b.lo << lsh; |
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97 n1 = (n1 << lsh) | (n0 >> (32 - lsh)); |
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98 n0 = n0 << lsh; |
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99 } |
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100 |
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101 a.lo = n0, a.hi = n1; |
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102 norm_udivmod32(&q0, &n0, a, b.lo); |
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103 q1 = 0; |
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104 |
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105 /* remainder is in n0 >> lsh */ |
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106 } else { |
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107 /* (q1 q0) = (n1 n0) / (0 d0) */ |
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108 |
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109 if (b.lo == 0) /* user wants to divide by zero! */ |
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110 b.lo = 1 / b.lo; /* so go ahead and crash */ |
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111 |
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112 lsh = CountLeadingZeros(b.lo); |
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113 |
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114 if (lsh == 0) { |
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115 /* |
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116 * From (n1 >= b.lo) |
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117 * && (the most significant bit of b.lo is set), |
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118 * conclude that |
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119 * (the most significant bit of n1 is set) |
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120 * && (the leading quotient digit q1 = 1). |
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121 * |
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122 * This special case is necessary, not an optimization |
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123 * (Shifts counts of 32 are undefined). |
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124 */ |
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125 n1 -= b.lo; |
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126 q1 = 1; |
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127 } else { |
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128 /* |
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129 * Normalize. |
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130 */ |
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131 rsh = 32 - lsh; |
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132 |
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133 b.lo = b.lo << lsh; |
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134 n2 = n1 >> rsh; |
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135 n1 = (n1 << lsh) | (n0 >> rsh); |
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136 n0 = n0 << lsh; |
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137 |
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138 a.lo = n1, a.hi = n2; |
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139 norm_udivmod32(&q1, &n1, a, b.lo); |
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140 } |
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141 |
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142 /* n1 != b.lo... */ |
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143 |
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144 a.lo = n0, a.hi = n1; |
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145 norm_udivmod32(&q0, &n0, a, b.lo); |
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146 |
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147 /* remainder in n0 >> lsh */ |
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148 } |
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149 |
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150 if (rp) { |
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151 rp->lo = n0 >> lsh; |
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152 rp->hi = 0; |
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153 } |
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154 } else { |
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155 if (b.hi > n1) { |
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156 /* (0 0) = (n1 n0) / (D1 d0) */ |
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157 |
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158 q0 = 0; |
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159 q1 = 0; |
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160 |
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161 /* remainder in (n1 n0) */ |
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162 if (rp) { |
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163 rp->lo = n0; |
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164 rp->hi = n1; |
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165 } |
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166 } else { |
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167 /* (0 q0) = (n1 n0) / (d1 d0) */ |
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168 |
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169 lsh = CountLeadingZeros(b.hi); |
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170 if (lsh == 0) { |
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171 /* |
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172 * From (n1 >= b.hi) |
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173 * && (the most significant bit of b.hi is set), |
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174 * conclude that |
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175 * (the most significant bit of n1 is set) |
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176 * && (the quotient digit q0 = 0 or 1). |
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177 * |
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178 * This special case is necessary, not an optimization. |
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179 */ |
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180 |
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181 /* |
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182 * The condition on the next line takes advantage of that |
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183 * n1 >= b.hi (true due to control flow). |
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184 */ |
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185 if (n1 > b.hi || n0 >= b.lo) { |
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186 q0 = 1; |
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187 a.lo = n0, a.hi = n1; |
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188 LL_SUB(a, a, b); |
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189 } else { |
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190 q0 = 0; |
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191 } |
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192 q1 = 0; |
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193 |
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194 if (rp) { |
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195 rp->lo = n0; |
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196 rp->hi = n1; |
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197 } |
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198 } else { |
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199 PRInt64 m; |
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200 |
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201 /* |
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202 * Normalize. |
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203 */ |
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204 rsh = 32 - lsh; |
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205 |
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206 b.hi = (b.hi << lsh) | (b.lo >> rsh); |
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207 b.lo = b.lo << lsh; |
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208 n2 = n1 >> rsh; |
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209 n1 = (n1 << lsh) | (n0 >> rsh); |
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210 n0 = n0 << lsh; |
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211 |
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212 a.lo = n1, a.hi = n2; |
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213 norm_udivmod32(&q0, &n1, a, b.hi); |
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214 LL_MUL32(m, q0, b.lo); |
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215 |
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216 if ((m.hi > n1) || ((m.hi == n1) && (m.lo > n0))) { |
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217 q0--; |
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218 LL_SUB(m, m, b); |
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219 } |
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220 |
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221 q1 = 0; |
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222 |
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223 /* Remainder is ((n1 n0) - (m1 m0)) >> lsh */ |
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224 if (rp) { |
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225 a.lo = n0, a.hi = n1; |
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226 LL_SUB(a, a, m); |
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227 rp->lo = (a.hi << rsh) | (a.lo >> lsh); |
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228 rp->hi = a.hi >> lsh; |
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229 } |
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230 } |
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231 } |
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232 } |
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233 |
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234 if (qp) { |
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235 qp->lo = q0; |
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236 qp->hi = q1; |
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237 } |
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parents:
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238 } |
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This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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239 #endif /* !HAVE_LONG_LONG */ |