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Faster implementation of hexToInt that uses not branches. Ticket #3047. (CVS 4992)

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FossilOrigin-Name: a70e9587569c99dd05e79c6745ff930aa31d763c
This commit is contained in:
drh 2008-04-11 19:37:55 +00:00
parent 3a200e0a44
commit 06fbb733b9
3 changed files with 12 additions and 22 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Avoid\sthe\suse\sof\suninitialized\svariables\sin\ssqlite3GenerateRowIndexDelete.\nTicket\s#3048.\s(CVS\s4991)
D 2008-04-11T19:18:25
C Faster\simplementation\sof\shexToInt\sthat\suses\snot\sbranches.\s\sTicket\s#3047.\s(CVS\s4992)
D 2008-04-11T19:37:56
F Makefile.arm-wince-mingw32ce-gcc ac5f7b2cef0cd850d6f755ba6ee4ab961b1fadf7
F Makefile.in b861627d91df5ee422c54237aa38296954dc0151
F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@ -173,7 +173,7 @@ F src/tokenize.c a96abe15a8db6fea2e964cdce2acba9ed17bc26f
F src/trigger.c 9bd3b6fa0beff4a02d262c96466f752ec15a7fc3
F src/update.c d6f214aad7eab5aaec5f966058b0828b3f7d6706
F src/utf.c 8c94fa10efc78c2568d08d436acc59df4df7191b
F src/util.c 02c57c302ef738ff5b554953c12d8f919e501583
F src/util.c 719bcd7f088badb19dfa10f2542f1ef54e673da5
F src/vacuum.c 3524411bfb58aac0d87eadd3e5b7cd532772af30
F src/vdbe.c 444ab9ecc91f3c04b2b29ae604458426aa674fa6
F src/vdbe.h bfd84bda447f39cb599302c7ec85067dae20453c
@ -627,7 +627,7 @@ F www/tclsqlite.tcl 8be95ee6dba05eabcd27a9d91331c803f2ce2130
F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
F www/whentouse.tcl fc46eae081251c3c181bd79c5faef8195d7991a5
P 03c0279d7b004ccc4264143e366c793b4d774f9f
R 72b1ed2a0366710f33a40f7fc1d822b1
P a93b7a344a713a9ed9d72be4707eb28c2979648c
R ad4db1f58ad5d1e909c90f01c6018ce9
U drh
Z 00cf749f4a1eca48ead98ab1077543fc
Z edd38be2c3330bd5c64978b55d0e6a92

2
manifest.uuid
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@ -1 +1 @@
a93b7a344a713a9ed9d72be4707eb28c2979648c
a70e9587569c99dd05e79c6745ff930aa31d763c

20
src/util.c
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@ -14,7 +14,7 @@
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.219 2008/04/05 18:41:43 drh Exp $
** $Id: util.c,v 1.220 2008/04/11 19:37:56 drh Exp $
*/
#include "sqliteInt.h"
#include <stdarg.h>
@ -619,23 +619,13 @@ void sqlite3Put4byte(unsigned char *p, u32 v){
** character: 0..9a..fA..F
*/
static int hexToInt(int h){
assert( (h>='0' && h<='9') || (h>='a' && h<='f') || (h>='A' && h<='F') );
#if !defined(SQLITE_EBCDIC)
int x = h - '0';
if( x>9 ){
x = (h - 'A' + 10) & 0xf;
}
assert( x>=0 && x<=15 );
return x;
h += 9*(1&(h>>6));
#else
if( h>='0' && h<='9' ){
return h - '0';
}else if( h>='a' && h<='f' ){
return h - 'a' + 10;
}else{
assert( h>='A' && h<='F' );
return h - 'A' + 10;
}
h += 9*(1&~(h>>4));
#endif
return h & 0xf;
}
#endif /* !SQLITE_OMIT_BLOB_LITERAL || SQLITE_HAS_CODEC */