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Overview
Comment:Back out check-in (5108). The original isnan() implementation is preferred. Ticket #3101 and #3060. (CVS 5109)
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SHA1:2349ae75dfdd626ed97db99ac6de4bdc5a395008
User & Date: drh 2008-05-09 13:47:59
Context
2008-05-09
14:17
Fix the ALTER TABLE RENAME algorithm so that it is not confused by comments in the CREATE TABLE statement. Ticket #3102. (CVS 5110) check-in: ab18b4e7 user: drh tags: trunk
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
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 1.226 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







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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 1.227 2008/05/09 13:47:59 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){
  /* This NaN test sometimes fails if compiled on GCC with -ffast-math.
  ** On the other hand, the use of -ffast-math comes with the following
  ** warning:
  **
  **      This option [-ffast-math] should never be turned on by any
  **      -O option since it can result in incorrect output for programs
  **      which depend on an exact implementation of IEEE or ISO 
  **      rules/specifications for math functions.
  */
  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