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Overview
Comment:Change the implementation of sqlite3IsNaN() so that it works even if compiled using -ffinite-math-only. Tickets #3101 and #3060. (CVS 5108)
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SHA1:19ee2b3324461150d2c1600c67fe604114a1b69f
User & Date: drh 2008-05-09 03:07:34
Context
2008-05-09
13:47
Back out check-in (5108). The original isnan() implementation is preferred. Ticket #3101 and #3060. (CVS 5109) check-in: 2349ae75 user: drh tags: trunk
03:07
Change the implementation of sqlite3IsNaN() so that it works even if compiled using -ffinite-math-only. Tickets #3101 and #3060. (CVS 5108) check-in: 19ee2b33 user: drh tags: trunk
2008-05-08
16:51
Fix recently introduced bug in tester.tcl. (CVS 5107) check-in: 4b573d4e user: danielk1977 tags: trunk
Changes
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Changes to src/util.c.

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**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.225 2008/05/01 02:47:04 shane Exp $
*/
#include "sqliteInt.h"
#include <stdarg.h>
#include <ctype.h>


/*
** Return true if the floating point value is Not a Number.
*/
int sqlite3IsNaN(double x){


  volatile double y = x;
  return x!=y;









}

/*
** Set the most recent error code and error string for the sqlite
** handle "db". The error code is set to "err_code".
**
** If it is not NULL, string zFormat specifies the format of the







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**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.226 2008/05/09 03:07:34 drh Exp $
*/
#include "sqliteInt.h"
#include <stdarg.h>
#include <ctype.h>


/*
** Return true if the floating point value is Not a Number.
*/
int sqlite3IsNaN(double x){
#if 0
  /* This reportedly fails when compiled with -ffinite-math-only */
  volatile double y = x;
  return x!=y;
#endif
  /* We have to look at bit patterns to accurately determine NaN.
  ** See ticket #3101 and
  ** https://mail.mozilla.org/pipermail/tamarin-devel/2008-February/000325.html
  */
  sqlite3_uint64 y = *(sqlite3_uint64*)&x;
  assert( sizeof(x)==sizeof(y) );
  y &= (((sqlite3_uint64)0x80000000)<<32)-1;
  return y > (((sqlite3_uint64)0x7ff00000)<<32);
}

/*
** Set the most recent error code and error string for the sqlite
** handle "db". The error code is set to "err_code".
**
** If it is not NULL, string zFormat specifies the format of the