SQLite

Check-in [be2570c061]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Use (((i64)1)<<63) instead of just (1<<63) to compute the most negative 64-bit integer. (CVS 4131)
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: be2570c061e1e751d1a46450bd1186549146526e
User & Date: danielk1977 2007-06-26 12:52:34.000
Context
2007-06-26
12:54
Reorganize comments in fts2_tokenizer.h. No code changes. (CVS 4132) (check-in: b331e30395 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: be2570c061 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: c6dfd9e434 user: danielk1977 tags: trunk)
Changes
Side-by-Side Diff Ignore Whitespace Patch
Changes to src/vdbe.c.
︙
39
40
41
42
43
44
45
46

47
48
49
50
51
52
53

39
40
41
42
43
44
45

46
47
48
49
50
51
52
53








-
+








**
** 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 $
** $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"
︙
1156
1157
1158
1159
1160
1161
1162
1163

1164
1165
1166
1167
1168
1169
1170

1156
1157
1158
1159
1160
1161
1162

1163
1164
1165
1166
1167
1168
1169
1170








-
+








        /* 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;
        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;
︙