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Change the OP_IfNotZero opcode so that it decrements register P1 by 1 rather

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than the value in P3, and so that it only decrements if originally positive.
This avoids decrementing the smallest 64-bit signed integer.

FossilOrigin-Name: 165c044686212fbf7182dd560ad1e57eb4cc9838
This commit is contained in:
drh
2016-12-18 17:42:00 +00:00
parent 22d709dd91
commit f99dd359d0
4 changed files with 15 additions and 15 deletions
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12
src/vdbe.c
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@@ -6012,20 +6012,20 @@ case OP_OffsetLimit: { /* in1, out2, in3 */
break;
}
/* Opcode: IfNotZero P1 P2 P3 * *
** Synopsis: if r[P1]!=0 then r[P1]-=P3, goto P2
/* Opcode: IfNotZero P1 P2 * * *
** Synopsis: if r[P1]!=0 then r[P1]--, goto P2
**
** Register P1 must contain an integer. If the content of register P1 is
** initially nonzero, then subtract P3 from the value in register P1 and
** jump to P2. If register P1 is initially zero, leave it unchanged
** and fall through.
** initially greater than zero, then decrement the value in register P1.
** If it is non-zero (negative or positive) and then also jump to P2.
** If register P1 is initially zero, leave it unchanged and fall through.
*/
case OP_IfNotZero: { /* jump, in1 */
pIn1 = &aMem[pOp->p1];
assert( pIn1->flags&MEM_Int );
VdbeBranchTaken(pIn1->u.i<0, 2);
if( pIn1->u.i ){
pIn1->u.i -= pOp->p3;
if( pIn1->u.i>0 ) pIn1->u.i--;
goto jump_to_p2;
}
break;