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Overview
Comment: | Added comment on floating point precision compile option for MSVC. (CVS 5448) |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
e20f2b8c6a13aa826703441cf340d0ee |
User & Date: | shane 2008-07-22 05:15:53.000 |
Context
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: 16f51f9b39 user: shane tags: trunk) | |
05:15 | Added comment on floating point precision compile option for MSVC. (CVS 5448) (check-in: e20f2b8c6a user: shane tags: trunk) | |
05:13 | Add assertion check for NaN support at startup. (CVS 5447) (check-in: 8474cde34b user: shane tags: trunk) | |
Changes
Changes to src/util.c.
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10 11 12 13 14 15 16 | ** ************************************************************************* ** Utility functions used throughout sqlite. ** ** This file contains functions for allocating memory, comparing ** strings, and stuff like that. ** | | | > > > > > > > > | 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | ** ************************************************************************* ** 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; |
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