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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Attempt to work around a bug in the Borland BCC 5.5.1 compiler. Ticket #2880. (CVS 4705)
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SHA1: 6de0ee49073c7a47d5e10495b569b33df76d1448
User & Date: drh 2008-01-11 00:06:11
Context
2008-01-11
15:27
Do explicit range tests before attempting to convert a 64-bit float into a 64-bit integer. Some systems (windows) seem to throw exceptions if the conversion is out of range. Ticket #2880. (CVS 4706) check-in: 4744257d user: drh tags: trunk
00:06
Attempt to work around a bug in the Borland BCC 5.5.1 compiler. Ticket #2880. (CVS 4705) check-in: 6de0ee49 user: drh tags: trunk
2008-01-10
23:50
More work toward converting the VM into a register-based machine. (CVS 4704) check-in: 8cbd4651 user: drh tags: trunk
Changes
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Changes to src/vdbemem.c.

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/*
** The MEM structure is already a MEM_Real.  Try to also make it a
** MEM_Int if we can.
*/
void sqlite3VdbeIntegerAffinity(Mem *pMem){
  assert( pMem->flags & MEM_Real );
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );

















  pMem->u.i = pMem->r;


  if( ((double)pMem->u.i)==pMem->r ){
    pMem->flags |= MEM_Int;
  }
}

/*
** Convert pMem to type integer.  Invalidate any prior representations.







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/*
** The MEM structure is already a MEM_Real.  Try to also make it a
** MEM_Int if we can.
*/
void sqlite3VdbeIntegerAffinity(Mem *pMem){
  assert( pMem->flags & MEM_Real );
  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );

  /* It is reported (in ticket #2880) that the BCC 5.5.1 compiler
  ** will corrupt a floating point number on the right-hand side
  ** of an assignment if the lvalue for the assignment is an integer.
  **
  ** We will attempt to work around this bug in the Borland compiler
  ** by moving the value into a temporary variable first so that if
  ** the assignment into the integer really does corrupt the right-hand
  ** side value, it will corrupt a temporary variable that we do not
  ** care about.
  */
#ifdef __BORLANDC__
  {
    double r = pMem->r;
    pMem->u.i = r;
  }
#else
  pMem->u.i = pMem->r;
#endif

  if( ((double)pMem->u.i)==pMem->r ){
    pMem->flags |= MEM_Int;
  }
}

/*
** Convert pMem to type integer.  Invalidate any prior representations.