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Overview
| Comment: | Use (((i64)1)<<63) instead of just (1<<63) to compute the most negative 64-bit integer. (CVS 4131) |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
be2570c061e1e751d1a46450bd118654 |
| User & Date: | danielk1977 2007-06-26 12:52:34 |
Context
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2007-06-26
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| 12:54 | Reorganize comments in fts2_tokenizer.h. No code changes. (CVS 4132) check-in: b331e303 user: danielk1977 tags: trunk | |
| 12:52 | Use (((i64)1)<<63) instead of just (1<<63) to compute the most negative 64-bit integer. (CVS 4131) check-in: be2570c0 user: danielk1977 tags: trunk | |
| 11:13 | Fix for #2444: Avoid SIGFPE on 64-bit platforms when evaluating expressions like ((1<<63)/-1). (CVS 4130) check-in: c6dfd9e4 user: danielk1977 tags: trunk | |
Changes
Changes to src/vdbe.c.
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** ** Various scripts scan this source file in order to generate HTML ** documentation, headers files, or other derived files. The formatting ** of the code in this file is, therefore, important. See other comments ** in this file for details. If in doubt, do not deviate from existing ** commenting and indentation practices when changing or adding code. ** ** $Id: vdbe.c,v 1.633 2007/06/26 11:13:26 danielk1977 Exp $ */ #include "sqliteInt.h" #include "os.h" #include <ctype.h> #include <math.h> #include "vdbeInt.h" ................................................................................ /* Dividing the largest possible negative 64-bit integer (1<<63) by ** -1 returns an integer to large to store in a 64-bit data-type. On ** some architectures, the value overflows to (1<<63). On others, ** a SIGFPE is issued. The following statement normalizes this ** behaviour so that all architectures behave as if integer ** overflow occured. */ if( a==-1 && b==(1<<63) ) a = 1; b /= a; break; } default: { if( a==0 ) goto divide_by_zero; if( a==-1 ) a = 1; b %= a; |
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** ** Various scripts scan this source file in order to generate HTML ** documentation, headers files, or other derived files. The formatting ** of the code in this file is, therefore, important. See other comments ** in this file for details. If in doubt, do not deviate from existing ** commenting and indentation practices when changing or adding code. ** ** $Id: vdbe.c,v 1.634 2007/06/26 12:52:34 danielk1977 Exp $ */ #include "sqliteInt.h" #include "os.h" #include <ctype.h> #include <math.h> #include "vdbeInt.h" ................................................................................ /* Dividing the largest possible negative 64-bit integer (1<<63) by ** -1 returns an integer to large to store in a 64-bit data-type. On ** some architectures, the value overflows to (1<<63). On others, ** a SIGFPE is issued. The following statement normalizes this ** behaviour so that all architectures behave as if integer ** overflow occured. */ if( a==-1 && b==(((i64)1)<<63) ) a = 1; b /= a; break; } default: { if( a==0 ) goto divide_by_zero; if( a==-1 ) a = 1; b %= a; |