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Improvements to the way the LIKE optimization is implemented, resulting in

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slightly smaller and faster code that is easier to test.

FossilOrigin-Name: 54c63b329288729031f45b7778752552cd90e226
This commit is contained in:
drh
2016-05-02 10:25:42 +00:00
parent 40cf36ff17
commit 44aebff246
6 changed files with 43 additions and 52 deletions
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26
src/vdbe.c
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@@ -1091,10 +1091,12 @@ case OP_String8: { /* same as TK_STRING, out2 */
**
** The string value P4 of length P1 (bytes) is stored in register P2.
**
** If P5!=0 and the content of register P3 is greater than zero, then
** If P3 is not zero and the content of register P3 is equal to P5, then
** the datatype of the register P2 is converted to BLOB. The content is
** the same sequence of bytes, it is merely interpreted as a BLOB instead
** of a string, as if it had been CAST.
** of a string, as if it had been CAST. In other words:
**
** if( P3!=0 and reg[P3]==P5 ) reg[P2] := CAST(reg[P2] as BLOB)
*/
case OP_String: { /* out2 */
assert( pOp->p4.z!=0 );
@@ -1105,12 +1107,11 @@ case OP_String: { /* out2 */
pOut->enc = encoding;
UPDATE_MAX_BLOBSIZE(pOut);
#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
if( pOp->p5 ){
assert( pOp->p3>0 );
if( pOp->p3>0 ){
assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
pIn3 = &aMem[pOp->p3];
assert( pIn3->flags & MEM_Int );
if( pIn3->u.i ) pOut->flags = MEM_Blob|MEM_Static|MEM_Term;
if( pIn3->u.i==pOp->p5 ) pOut->flags = MEM_Blob|MEM_Static|MEM_Term;
}
#endif
break;
@@ -5966,21 +5967,6 @@ case OP_DecrJumpZero: { /* jump, in1 */
}
/* Opcode: JumpZeroIncr P1 P2 * * *
** Synopsis: if (r[P1]++)==0 ) goto P2
**
** The register P1 must contain an integer. If register P1 is initially
** zero, then jump to P2. Increment register P1 regardless of whether or
** not the jump is taken.
*/
case OP_JumpZeroIncr: { /* jump, in1 */
pIn1 = &aMem[pOp->p1];
assert( pIn1->flags&MEM_Int );
VdbeBranchTaken(pIn1->u.i==0, 2);
if( (pIn1->u.i++)==0 ) goto jump_to_p2;
break;
}
/* Opcode: AggStep0 * P2 P3 P4 P5
** Synopsis: accum=r[P3] step(r[P2@P5])
**