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Overview
Comment: | Faster implementation for sqlite3MulInt64(). |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
010c48f671e909cb406f3716102a0032 |
User & Date: | drh 2014-02-10 12:59:15.771 |
Context
2014-02-10
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15:56 | Improvements to a "Synopsis:" comment in the VDBE engine. (check-in: 0dfa7ee915 user: drh tags: trunk) | |
12:59 | Faster implementation for sqlite3MulInt64(). (check-in: 010c48f671 user: drh tags: trunk) | |
03:21 | Faster and smaller implementation of sqlite3_value_type(). (check-in: 5708bc24b8 user: drh tags: trunk) | |
Changes
Changes to src/util.c.
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1119 1120 1121 1122 1123 1124 1125 | i64 iA = *pA; testcase( iA==0 ); testcase( iA==1 ); testcase( iB==-1 ); testcase( iB==0 ); if( iB>=0 ){ testcase( iA>0 && LARGEST_INT64 - iA == iB ); testcase( iA>0 && LARGEST_INT64 - iA == iB - 1 ); if( iA>0 && LARGEST_INT64 - iA < iB ) return 1; | < < > | 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 | i64 iA = *pA; testcase( iA==0 ); testcase( iA==1 ); testcase( iB==-1 ); testcase( iB==0 ); if( iB>=0 ){ testcase( iA>0 && LARGEST_INT64 - iA == iB ); testcase( iA>0 && LARGEST_INT64 - iA == iB - 1 ); if( iA>0 && LARGEST_INT64 - iA < iB ) return 1; }else{ testcase( iA<0 && -(iA + LARGEST_INT64) == iB + 1 ); testcase( iA<0 && -(iA + LARGEST_INT64) == iB + 2 ); if( iA<0 && -(iA + LARGEST_INT64) > iB + 1 ) return 1; } *pA += iB; return 0; } int sqlite3SubInt64(i64 *pA, i64 iB){ testcase( iB==SMALLEST_INT64+1 ); if( iB==SMALLEST_INT64 ){ testcase( (*pA)==(-1) ); testcase( (*pA)==0 ); if( (*pA)>=0 ) return 1; |
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1149 1150 1151 1152 1153 1154 1155 | i64 iA = *pA; i64 iA1, iA0, iB1, iB0, r; iA1 = iA/TWOPOWER32; iA0 = iA % TWOPOWER32; iB1 = iB/TWOPOWER32; iB0 = iB % TWOPOWER32; | | > > > > | > | > > > > | 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 | i64 iA = *pA; i64 iA1, iA0, iB1, iB0, r; iA1 = iA/TWOPOWER32; iA0 = iA % TWOPOWER32; iB1 = iB/TWOPOWER32; iB0 = iB % TWOPOWER32; if( iA1==0 ){ if( iB1==0 ){ *pA *= iB; return 0; } r = iA0*iB1; }else if( iB1==0 ){ r = iA1*iB0; }else{ /* If both iA1 and iB1 are non-zero, overflow will result */ return 1; } testcase( r==(-TWOPOWER31)-1 ); testcase( r==(-TWOPOWER31) ); testcase( r==TWOPOWER31 ); testcase( r==TWOPOWER31-1 ); if( r<(-TWOPOWER31) || r>=TWOPOWER31 ) return 1; r *= TWOPOWER32; if( sqlite3AddInt64(&r, iA0*iB0) ) return 1; |
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