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Commit32ba2b5

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committed
Use memcmp() rather than strncmp() when shorter string length is known.
It appears that this will be faster for all but the shortest strings;at least one some platforms, memcmp() can use word-at-a-time comparisons.Noah Misch, somewhat pared down.
1 parentc5160b7 commit32ba2b5

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7 files changed

+33
-33
lines changed

7 files changed

+33
-33
lines changed

‎contrib/hstore/hstore_io.c‎

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -280,9 +280,9 @@ comparePairs(const void *a, const void *b)
280280
{
281281
if (((Pairs*)a)->keylen== ((Pairs*)b)->keylen)
282282
{
283-
intres=strncmp(((Pairs*)a)->key,
284-
((Pairs*)b)->key,
285-
((Pairs*)a)->keylen);
283+
intres=memcmp(((Pairs*)a)->key,
284+
((Pairs*)b)->key,
285+
((Pairs*)a)->keylen);
286286

287287
if (res)
288288
returnres;
@@ -324,7 +324,7 @@ hstoreUniquePairs(Pairs *a, int4 l, int4 *buflen)
324324
while (ptr-a<l)
325325
{
326326
if (ptr->keylen==res->keylen&&
327-
strncmp(ptr->key,res->key,res->keylen)==0)
327+
memcmp(ptr->key,res->key,res->keylen)==0)
328328
{
329329
if (ptr->needfree)
330330
{

‎contrib/hstore/hstore_op.c‎

Lines changed: 13 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -49,7 +49,7 @@ hstoreFindKey(HStore *hs, int *lowbound, char *key, int keylen)
4949
stopMiddle=stopLow+ (stopHigh-stopLow) /2;
5050

5151
if (HS_KEYLEN(entries,stopMiddle)==keylen)
52-
difference=strncmp(HS_KEY(entries,base,stopMiddle),key,keylen);
52+
difference=memcmp(HS_KEY(entries,base,stopMiddle),key,keylen);
5353
else
5454
difference= (HS_KEYLEN(entries,stopMiddle)>keylen) ?1 :-1;
5555

@@ -263,7 +263,7 @@ hstore_delete(PG_FUNCTION_ARGS)
263263
intlen=HS_KEYLEN(es,i);
264264
char*ptrs=HS_KEY(es,bufs,i);
265265

266-
if (!(len==keylen&&strncmp(ptrs,keyptr,keylen)==0))
266+
if (!(len==keylen&&memcmp(ptrs,keyptr,keylen)==0))
267267
{
268268
intvallen=HS_VALLEN(es,i);
269269

@@ -331,9 +331,9 @@ hstore_delete_array(PG_FUNCTION_ARGS)
331331
intskeylen=HS_KEYLEN(es,i);
332332

333333
if (skeylen==key_pairs[j].keylen)
334-
difference=strncmp(HS_KEY(es,ps,i),
335-
key_pairs[j].key,
336-
key_pairs[j].keylen);
334+
difference=memcmp(HS_KEY(es,ps,i),
335+
key_pairs[j].key,
336+
key_pairs[j].keylen);
337337
else
338338
difference= (skeylen>key_pairs[j].keylen) ?1 :-1;
339339
}
@@ -416,9 +416,9 @@ hstore_delete_hstore(PG_FUNCTION_ARGS)
416416
ints2keylen=HS_KEYLEN(es2,j);
417417

418418
if (skeylen==s2keylen)
419-
difference=strncmp(HS_KEY(es,ps,i),
420-
HS_KEY(es2,ps2,j),
421-
skeylen);
419+
difference=memcmp(HS_KEY(es,ps,i),
420+
HS_KEY(es2,ps2,j),
421+
skeylen);
422422
else
423423
difference= (skeylen>s2keylen) ?1 :-1;
424424
}
@@ -433,7 +433,7 @@ hstore_delete_hstore(PG_FUNCTION_ARGS)
433433
if (snullval!=HS_VALISNULL(es2,j)
434434
|| (!snullval
435435
&& (svallen!=HS_VALLEN(es2,j)
436-
||strncmp(HS_VAL(es,ps,i),HS_VAL(es2,ps2,j),svallen)!=0)))
436+
||memcmp(HS_VAL(es,ps,i),HS_VAL(es2,ps2,j),svallen)!=0)))
437437
{
438438
HS_COPYITEM(ed,bufd,pd,
439439
HS_KEY(es,ps,i),HS_KEYLEN(es,i),
@@ -526,9 +526,9 @@ hstore_concat(PG_FUNCTION_ARGS)
526526
ints2keylen=HS_KEYLEN(es2,s2idx);
527527

528528
if (s1keylen==s2keylen)
529-
difference=strncmp(HS_KEY(es1,ps1,s1idx),
530-
HS_KEY(es2,ps2,s2idx),
531-
s1keylen);
529+
difference=memcmp(HS_KEY(es1,ps1,s1idx),
530+
HS_KEY(es2,ps2,s2idx),
531+
s1keylen);
532532
else
533533
difference= (s1keylen>s2keylen) ?1 :-1;
534534
}
@@ -996,7 +996,7 @@ hstore_contains(PG_FUNCTION_ARGS)
996996
if (nullval!=HS_VALISNULL(ve,idx)
997997
|| (!nullval
998998
&& (vallen!=HS_VALLEN(ve,idx)
999-
||strncmp(HS_VAL(te,tstr,i),HS_VAL(ve,vstr,idx),vallen))))
999+
||memcmp(HS_VAL(te,tstr,i),HS_VAL(ve,vstr,idx),vallen))))
10001000
res= false;
10011001
}
10021002
else

‎contrib/ltree/ltree_gist.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -546,7 +546,7 @@ gist_tqcmp(ltree *t, lquery *q)
546546
while (an>0&&bn>0)
547547
{
548548
bl=LQL_FIRST(ql);
549-
if ((res=strncmp(al->name,bl->name,Min(al->len,bl->len)))==0)
549+
if ((res=memcmp(al->name,bl->name,Min(al->len,bl->len)))==0)
550550
{
551551
if (al->len!=bl->len)
552552
returnal->len-bl->len;

‎contrib/ltree/ltree_op.c‎

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -68,7 +68,7 @@ ltree_compare(const ltree *a, const ltree *b)
6868

6969
while (an>0&&bn>0)
7070
{
71-
if ((res=strncmp(al->name,bl->name,Min(al->len,bl->len)))==0)
71+
if ((res=memcmp(al->name,bl->name,Min(al->len,bl->len)))==0)
7272
{
7373
if (al->len!=bl->len)
7474
return (al->len-bl->len)*10* (an+1);
@@ -165,7 +165,7 @@ inner_isparent(const ltree *c, const ltree *p)
165165
{
166166
if (cl->len!=pl->len)
167167
return false;
168-
if (strncmp(cl->name,pl->name,cl->len))
168+
if (memcmp(cl->name,pl->name,cl->len))
169169
return false;
170170

171171
pn--;
@@ -373,7 +373,7 @@ ltree_index(PG_FUNCTION_ARGS)
373373
bptr=LTREE_FIRST(b);
374374
for (j=0;j<b->numlevel;j++)
375375
{
376-
if (!(aptr->len==bptr->len&&strncmp(aptr->name,bptr->name,aptr->len)==0))
376+
if (!(aptr->len==bptr->len&&memcmp(aptr->name,bptr->name,aptr->len)==0))
377377
break;
378378
aptr=LEVEL_NEXT(aptr);
379379
bptr=LEVEL_NEXT(bptr);
@@ -451,7 +451,7 @@ lca_inner(ltree **a, int len)
451451
num=0;
452452
for (i=0;i<Min(tmp, (*ptr)->numlevel-1);i++)
453453
{
454-
if (l1->len==l2->len&&strncmp(l1->name,l2->name,l1->len)==0)
454+
if (l1->len==l2->len&&memcmp(l1->name,l2->name,l1->len)==0)
455455
num=i+1;
456456
else
457457
break;

‎src/backend/nodes/readfuncs.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1196,7 +1196,7 @@ parseNodeString(void)
11961196
token=pg_strtok(&length);
11971197

11981198
#defineMATCH(tokname,namelen) \
1199-
(length == namelen &&strncmp(token, tokname, namelen) == 0)
1199+
(length == namelen &&memcmp(token, tokname, namelen) == 0)
12001200

12011201
if (MATCH("QUERY",5))
12021202
return_value=_readQuery();

‎src/backend/utils/adt/varchar.c‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -690,7 +690,7 @@ bpchareq(PG_FUNCTION_ARGS)
690690
if (len1!=len2)
691691
result= false;
692692
else
693-
result= (strncmp(VARDATA_ANY(arg1),VARDATA_ANY(arg2),len1)==0);
693+
result= (memcmp(VARDATA_ANY(arg1),VARDATA_ANY(arg2),len1)==0);
694694

695695
PG_FREE_IF_COPY(arg1,0);
696696
PG_FREE_IF_COPY(arg2,1);
@@ -717,7 +717,7 @@ bpcharne(PG_FUNCTION_ARGS)
717717
if (len1!=len2)
718718
result= true;
719719
else
720-
result= (strncmp(VARDATA_ANY(arg1),VARDATA_ANY(arg2),len1)!=0);
720+
result= (memcmp(VARDATA_ANY(arg1),VARDATA_ANY(arg2),len1)!=0);
721721

722722
PG_FREE_IF_COPY(arg1,0);
723723
PG_FREE_IF_COPY(arg2,1);
@@ -905,7 +905,7 @@ internal_bpchar_pattern_compare(BpChar *arg1, BpChar *arg2)
905905
len1=bcTruelen(arg1);
906906
len2=bcTruelen(arg2);
907907

908-
result=strncmp(VARDATA_ANY(arg1),VARDATA_ANY(arg2),Min(len1,len2));
908+
result=memcmp(VARDATA_ANY(arg1),VARDATA_ANY(arg2),Min(len1,len2));
909909
if (result!=0)
910910
returnresult;
911911
elseif (len1<len2)

‎src/backend/utils/adt/varlena.c‎

Lines changed: 7 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -1286,7 +1286,7 @@ varstr_cmp(char *arg1, int len1, char *arg2, int len2)
12861286
*/
12871287
if (lc_collate_is_c())
12881288
{
1289-
result=strncmp(arg1,arg2,Min(len1,len2));
1289+
result=memcmp(arg1,arg2,Min(len1,len2));
12901290
if ((result==0)&& (len1!=len2))
12911291
result= (len1<len2) ?-1 :1;
12921292
}
@@ -1370,7 +1370,7 @@ varstr_cmp(char *arg1, int len1, char *arg2, int len2)
13701370
*/
13711371
if (result==0)
13721372
{
1373-
result=strncmp(arg1,arg2,Min(len1,len2));
1373+
result=memcmp(arg1,arg2,Min(len1,len2));
13741374
if ((result==0)&& (len1!=len2))
13751375
result= (len1<len2) ?-1 :1;
13761376
}
@@ -1462,8 +1462,8 @@ texteq(PG_FUNCTION_ARGS)
14621462
if (VARSIZE_ANY_EXHDR(arg1)!=VARSIZE_ANY_EXHDR(arg2))
14631463
result= false;
14641464
else
1465-
result= (strncmp(VARDATA_ANY(arg1),VARDATA_ANY(arg2),
1466-
VARSIZE_ANY_EXHDR(arg1))==0);
1465+
result= (memcmp(VARDATA_ANY(arg1),VARDATA_ANY(arg2),
1466+
VARSIZE_ANY_EXHDR(arg1))==0);
14671467

14681468
PG_FREE_IF_COPY(arg1,0);
14691469
PG_FREE_IF_COPY(arg2,1);
@@ -1485,8 +1485,8 @@ textne(PG_FUNCTION_ARGS)
14851485
if (VARSIZE_ANY_EXHDR(arg1)!=VARSIZE_ANY_EXHDR(arg2))
14861486
result= true;
14871487
else
1488-
result= (strncmp(VARDATA_ANY(arg1),VARDATA_ANY(arg2),
1489-
VARSIZE_ANY_EXHDR(arg1))!=0);
1488+
result= (memcmp(VARDATA_ANY(arg1),VARDATA_ANY(arg2),
1489+
VARSIZE_ANY_EXHDR(arg1))!=0);
14901490

14911491
PG_FREE_IF_COPY(arg1,0);
14921492
PG_FREE_IF_COPY(arg2,1);
@@ -1612,7 +1612,7 @@ internal_text_pattern_compare(text *arg1, text *arg2)
16121612
len1=VARSIZE_ANY_EXHDR(arg1);
16131613
len2=VARSIZE_ANY_EXHDR(arg2);
16141614

1615-
result=strncmp(VARDATA_ANY(arg1),VARDATA_ANY(arg2),Min(len1,len2));
1615+
result=memcmp(VARDATA_ANY(arg1),VARDATA_ANY(arg2),Min(len1,len2));
16161616
if (result!=0)
16171617
returnresult;
16181618
elseif (len1<len2)

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