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| Comment: | Added comment on floating point precision compile option for MSVC. (CVS 5448) |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
e20f2b8c6a13aa826703441cf340d0ee |
| User & Date: | shane 2008-07-22 05:15:53 |
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2008-07-22
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| 05:18 | Changed a few loop counters to unsigned ints to remove compiler warnings. (CVS 5449) (check-in: 16f51f9b user: shane tags: trunk) | |
| 05:15 | Added comment on floating point precision compile option for MSVC. (CVS 5448) (check-in: e20f2b8c user: shane tags: trunk) | |
| 05:13 | Add assertion check for NaN support at startup. (CVS 5447) (check-in: 8474cde3 user: shane tags: trunk) | |
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 1.238 2008/07/11 16:19:10 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. */ #ifdef __FAST_MATH__ # error SQLite will not work correctly with the -ffast-math option of GCC. #endif volatile double y = x; volatile double z = y; return y!=z; |
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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 1.239 2008/07/22 05:15:53 shane Exp $ */ #include "sqliteInt.h" #include <stdarg.h> #include <ctype.h> /* ** Return true if the floating point value is Not a Number (NaN). */ 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. ** ** Under MSVC, this NaN test may fail if compiled with a floating- ** point precision mode other than /fp:precise. From the MSDN ** documentation: ** ** The compiler [with /fp:precise] will properly handle comparisons ** involving NaN. For example, x != x evaluates to true if x is NaN ** ... */ #ifdef __FAST_MATH__ # error SQLite will not work correctly with the -ffast-math option of GCC. #endif volatile double y = x; volatile double z = y; return y!=z; |