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Add the OP_ZeroOrNull opcode and use it to compute boolean values for

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scalar comparisons, rather than the SQLITE_STOREP2 parameter to the comparison
opcode.

FossilOrigin-Name: 93781b6f10a94fb273204b95156a8b90e07071f28c89e7966c659a0f44f60e98
This commit is contained in:
drh
2021-03-29 14:40:48 +00:00
parent 1f97d2618b
commit 871e7ff43d
4 changed files with 34 additions and 13 deletions
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18
src/vdbe.c
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@@ -2502,6 +2502,24 @@ case OP_IsNull: { /* same as TK_ISNULL, jump, in1 */
break;
}
/* Opcode: ZeroOrNull P1 P2 P3 * *
** Synopsis: r[P2] = (P1,P3 NOT NULL) ? 0 : NULL;
**
** If both registers P1 and P3 are NOT NULL, then store a zero in
** register P2. If either register P1 or register P3 or both contain
** a NULL then store a NULL in register P2.
*/
case OP_ZeroOrNull: { /* in1, out2, in3 */
if( (aMem[pOp->p1].flags & MEM_Null)!=0
|| (aMem[pOp->p3].flags & MEM_Null)!=0
){
sqlite3VdbeMemSetNull(aMem + pOp->p2);
}else{
sqlite3VdbeMemSetInt64(aMem + pOp->p2, 0);
}
break;
}
/* Opcode: NotNull P1 P2 * * *
** Synopsis: if r[P1]!=NULL goto P2
**