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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Prevent a warning about integer overflow when using a very large negative LIMIT.
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SHA1: 96106d5620eae51474234f4eec1d2c5bd570d486
User & Date: drh 2016-11-30 01:05:41
Context
2016-11-30
04:07
More improvements to boundary cases in the date/time functions, flowing out of branch coverage testing. check-in: 1218005a user: drh tags: trunk
01:05
Prevent a warning about integer overflow when using a very large negative LIMIT. check-in: 96106d56 user: drh tags: trunk
00:48
Further changes to the date/time functions to suppress harmless signed integer overflow warnings that could have occurred when doing out-of-range date calculations which, according to the docs, give undefined results. check-in: dc453b34 user: drh tags: trunk
Changes
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Changes to src/vdbe.c.

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  }
  break;
}

/* Opcode: DecrJumpZero P1 P2 * * *
** Synopsis: if (--r[P1])==0 goto P2
**
** Register P1 must hold an integer.  Decrement the value in register P1
** then jump to P2 if the new value is exactly zero.
*/
case OP_DecrJumpZero: {      /* jump, in1 */
  pIn1 = &aMem[pOp->p1];
  assert( pIn1->flags&MEM_Int );

  pIn1->u.i--;
  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])
**







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  }
  break;
}

/* Opcode: DecrJumpZero P1 P2 * * *
** Synopsis: if (--r[P1])==0 goto P2
**
** Register P1 must hold an integer.  If the value in P1 is positive,
** decrement the value and jump to P2 if the new value is exactly zero.
*/
case OP_DecrJumpZero: {      /* jump, in1 */
  pIn1 = &aMem[pOp->p1];
  assert( pIn1->flags&MEM_Int );
  if( pIn1->u.i>0 ){
    pIn1->u.i--;
    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])
**