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Tighten coding of fmgr_isbuiltin() ... managed to speed it up 

by about 10% which seems to be good for half a percent or so of a SELECT.
This commit is contained in:
Tom Lane 1999-01-25 00:44:53 +00:00
parent 49b6be244c
commit 443e24beb7
1 changed files with 25 additions and 23 deletions
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48
src/backend/utils/Gen_fmgrtab.sh.in
View File

@ -8,7 +8,7 @@
#
#
# IDENTIFICATION
# $Header: /cvsroot/pgsql/src/backend/utils/Attic/Gen_fmgrtab.sh.in,v 1.12 1998/10/28 19:38:47 tgl Exp $
# $Header: /cvsroot/pgsql/src/backend/utils/Attic/Gen_fmgrtab.sh.in,v 1.13 1999/01/25 00:44:53 tgl Exp $
#
# NOTES
# Passes any -D options on to cpp prior to generating the list
@ -83,7 +83,7 @@ cat > $HFILE <<FuNkYfMgRsTuFf
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: Gen_fmgrtab.sh.in,v 1.12 1998/10/28 19:38:47 tgl Exp $
* $Id: Gen_fmgrtab.sh.in,v 1.13 1999/01/25 00:44:53 tgl Exp $
*
* NOTES
* ******************************
@ -197,7 +197,7 @@ cat > $TABCFILE <<FuNkYfMgRtAbStUfF
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/Attic/Gen_fmgrtab.sh.in,v 1.12 1998/10/28 19:38:47 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/Attic/Gen_fmgrtab.sh.in,v 1.13 1999/01/25 00:44:53 tgl Exp $
*
* NOTES
*
@ -250,36 +250,38 @@ cat >> $TABCFILE <<FuNkYfMgRtAbStUfF
#endif /* WIN32 */
};
static int fmgr_nbuiltins = (sizeof(fmgr_builtins) / sizeof(FmgrCall)) - 1;
/* Note FMGR_NBUILTINS excludes the guardian entry, which is probably
* not really needed at all ...
*/
#define FMGR_NBUILTINS ((sizeof(fmgr_builtins) / sizeof(FmgrCall)) - 1)
FmgrCall *fmgr_isbuiltin(Oid id)
{
register int i = 0;
int low = 0;
int high = fmgr_nbuiltins;
int high = FMGR_NBUILTINS - 1;
low = 0;
high = fmgr_nbuiltins;
while (low <= high) {
i = low + (high - low) / 2;
if (id == fmgr_builtins[i].proid)
break;
else if (id > fmgr_builtins[i].proid)
low = i + 1;
else
high = i - 1;
}
if (id == fmgr_builtins[i].proid)
return(&fmgr_builtins[i]);
return((FmgrCall *) NULL);
/* Loop invariant: low is the first index that could contain target
* entry, and high is the last index that could contain it.
*/
while (low <= high) {
int i = (high + low) / 2;
FmgrCall * ptr = &fmgr_builtins[i];
if (id == ptr->proid)
return ptr;
else if (id > ptr->proid)
low = i + 1;
else
high = i - 1;
}
return (FmgrCall *) NULL;
}
func_ptr fmgr_lookupByName(char *name)
{
int i;
for (i=0;i<fmgr_nbuiltins;i++) {
if (strcmp(name,fmgr_builtins[i].funcName) == 0)
return(fmgr_builtins[i].func);
for (i=0; i<FMGR_NBUILTINS; i++) {
if (strcmp(name,fmgr_builtins[i].funcName) == 0)
return(fmgr_builtins[i].func);
}
return((func_ptr) NULL);
}