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

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FossilOrigin-Name: a70e9587569c99dd05e79c6745ff930aa31d763c
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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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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 */