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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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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
19ee2b3324461150d2c1600c67fe6041 |
| User & Date: | drh 2008-05-09 03:07:34 |
Context
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2008-05-09
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| 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 | |
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2008-05-08
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| 16:51 | Fix recently introduced bug in tester.tcl. (CVS 5107) check-in: 4b573d4e user: danielk1977 tags: trunk | |
Changes
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 |