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Overview
| Comment: | Performance improvement and slight size reduction to the comparison operators in the VDBE. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | micro-optimizations |
| Files: | files | file ages | folders |
| SHA1: |
14052a7d088bed8196d90a3361ce717a |
| User & Date: | drh 2014-09-17 23:37:39.000 |
Context
|
2014-09-18
| ||
| 01:21 | Fix compiler warnings and change the nullMem structure initializer into a format that MSVC can understand. (Closed-Leaf check-in: 163bfae858 user: drh tags: micro-optimizations) | |
|
2014-09-17
| ||
| 23:37 | Performance improvement and slight size reduction to the comparison operators in the VDBE. (check-in: 14052a7d08 user: drh tags: micro-optimizations) | |
| 16:41 | In the Mem object, stop requiring that Mem.xDel be NULL when the MEM_Dyn bit is clear. Also reduce the amount of initialization of Mem objects. All for a small size reduction and performance increase. (check-in: fdddb477c8 user: drh tags: micro-optimizations) | |
Changes
Changes to src/vdbe.c.
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if( affinity ){
applyAffinity(pIn1, affinity, encoding);
applyAffinity(pIn3, affinity, encoding);
if( db->mallocFailed ) goto no_mem;
}
assert( pOp->p4type==P4_COLLSEQ || pOp->p4.pColl==0 );
| > | > > > | > > | 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 |
if( affinity ){
applyAffinity(pIn1, affinity, encoding);
applyAffinity(pIn3, affinity, encoding);
if( db->mallocFailed ) goto no_mem;
}
assert( pOp->p4type==P4_COLLSEQ || pOp->p4.pColl==0 );
if( pIn1->flags & MEM_Zero ){
sqlite3VdbeMemExpandBlob(pIn1);
flags1 &= ~MEM_Zero;
}
if( pIn3->flags & MEM_Zero ){
sqlite3VdbeMemExpandBlob(pIn3);
flags3 &= ~MEM_Zero;
}
res = sqlite3MemCompare(pIn3, pIn1, pOp->p4.pColl);
}
switch( pOp->opcode ){
case OP_Eq: res = res==0; break;
case OP_Ne: res = res!=0; break;
case OP_Lt: res = res<0; break;
case OP_Le: res = res<=0; break;
|
| ︙ | ︙ | |||
1933 1934 1935 1936 1937 1938 1939 |
}else{
VdbeBranchTaken(res!=0, (pOp->p5 & SQLITE_NULLEQ)?2:3);
if( res ){
pc = pOp->p2-1;
}
}
/* Undo any changes made by applyAffinity() to the input registers. */
| | | | 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 |
}else{
VdbeBranchTaken(res!=0, (pOp->p5 & SQLITE_NULLEQ)?2:3);
if( res ){
pc = pOp->p2-1;
}
}
/* Undo any changes made by applyAffinity() to the input registers. */
pIn1->flags = flags1;
pIn3->flags = flags3;
break;
}
/* Opcode: Permutation * * * P4 *
**
** Set the permutation used by the OP_Compare operator to be the array
** of integers in P4.
|
| ︙ | ︙ |