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InnoDB: Optimize page_cur_search_with_match().

Browse source 
innobase/btr/btr0cur.c:
  Disable the mode PAGE_CUR_LE_OR_EXTENDS at compile-time
innobase/include/page0cur.h:
  Disable the mode PAGE_CUR_LE_OR_EXTENDS at compile-time
  Do not define PAGE_CUR_DBG unless #ifdef UNIV_SEARCH_DEBUG
innobase/page/page0cur.c:
  Disable the mode PAGE_CUR_LE_OR_EXTENDS at compile-time
  Disable PAGE_CUR_DBG unless #ifdef UNIV_SEARCH_DEBUG
  
  page_cur_try_search_shortcut(): Optimize the predicates
  (compare the result of page_cmp_dtuple_rec_with_match() against 0,
  use page_rec_is_supremum()).
  
  page_cur_search_with_match(): Compare the result of
  cmp_dtuple_rec_with_match() against zero, add UNIV_LIKELY hints,
  replace duplicated code with gotos.
This commit is contained in:
unknown 2005-06-30 11:15:06 +03:00
parent 14ade13553
commit 384a0c0a0f
3 changed files with 66 additions and 48 deletions
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8
innobase/btr/btr0cur.c
View file

@ -316,7 +316,9 @@ btr_cur_search_to_nth_level(
if (btr_search_latch.writer == RW_LOCK_NOT_LOCKED
&& latch_mode <= BTR_MODIFY_LEAF && info->last_hash_succ
&& !estimate
#ifdef PAGE_CUR_LE_OR_EXTENDS
&& mode != PAGE_CUR_LE_OR_EXTENDS
#endif /* PAGE_CUR_LE_OR_EXTENDS */
&& srv_use_adaptive_hash_indexes
&& btr_search_guess_on_hash(index, info, tuple, mode,
latch_mode, cursor,
@ -391,8 +393,10 @@ btr_cur_search_to_nth_level(
break;
default:
ut_ad(mode == PAGE_CUR_L
|| mode == PAGE_CUR_LE
|| mode == PAGE_CUR_LE_OR_EXTENDS);
#ifdef PAGE_CUR_LE_OR_EXTENDS
|| mode == PAGE_CUR_LE_OR_EXTENDS
#endif /* PAGE_CUR_LE_OR_EXTENDS */
|| mode == PAGE_CUR_LE);
page_mode = mode;
break;
}

6
innobase/include/page0cur.h
View file

@ -26,11 +26,13 @@ Created 10/4/1994 Heikki Tuuri
#define PAGE_CUR_GE 2
#define PAGE_CUR_L 3
#define PAGE_CUR_LE 4
#define PAGE_CUR_LE_OR_EXTENDS 5 /* This is a search mode used in
/*#define PAGE_CUR_LE_OR_EXTENDS 5*/ /* This is a search mode used in
"column LIKE 'abc%' ORDER BY column DESC";
we have to find strings which are <= 'abc' or
which extend it */
#define PAGE_CUR_DBG 6
#ifdef UNIV_SEARCH_DEBUG
# define PAGE_CUR_DBG 6 /* As PAGE_CUR_LE, but skips search shortcut */
#endif /* UNIV_SEARCH_DEBUG */
#ifdef PAGE_CUR_ADAPT
# ifdef UNIV_SEARCH_PERF_STAT

100
innobase/page/page0cur.c
View file

@ -47,7 +47,6 @@ page_cur_try_search_shortcut(
not yet completely matched */
page_cur_t* cursor) /* out: page cursor */
{
int cmp;
rec_t* rec;
rec_t* next_rec;
ulint low_match;
@ -79,9 +78,8 @@ page_cur_try_search_shortcut(
up_match = low_match;
up_bytes = low_bytes;
cmp = page_cmp_dtuple_rec_with_match(tuple, rec, offsets, &low_match,
&low_bytes);
if (cmp == -1) {
if (page_cmp_dtuple_rec_with_match(tuple, rec, offsets,
&low_match, &low_bytes) < 0) {
goto exit_func;
}
@ -89,9 +87,8 @@ page_cur_try_search_shortcut(
offsets = rec_get_offsets(next_rec, index, offsets,
dtuple_get_n_fields(tuple), &heap);
cmp = page_cmp_dtuple_rec_with_match(tuple, next_rec, offsets,
&up_match, &up_bytes);
if (cmp != -1) {
if (page_cmp_dtuple_rec_with_match(tuple, next_rec, offsets,
&up_match, &up_bytes) >= 0) {
goto exit_func;
}
@ -115,7 +112,7 @@ page_cur_try_search_shortcut(
ut_a(*ilow_matched_fields == low_match);
ut_a(*ilow_matched_bytes == low_bytes);
#endif
if (next_rec != page_get_supremum_rec(page)) {
if (!page_rec_is_supremum(next_rec)) {
*iup_matched_fields = up_match;
*iup_matched_bytes = up_bytes;
@ -137,6 +134,7 @@ exit_func:
#endif
#ifdef PAGE_CUR_LE_OR_EXTENDS
/********************************************************************
Checks if the nth field in a record is a character type field which extends
the nth field in tuple, i.e., the field is longer or equal in length and has
@ -185,6 +183,7 @@ page_cur_rec_field_extends(
return(FALSE);
}
#endif /* PAGE_CUR_LE_OR_EXTENDS */
/********************************************************************
Searches the right position for a page cursor. */
@ -240,9 +239,14 @@ page_cur_search_with_match(
ut_ad(dtuple_validate(tuple));
ut_ad(dtuple_check_typed(tuple));
ut_ad((mode == PAGE_CUR_L) || (mode == PAGE_CUR_LE)
|| (mode == PAGE_CUR_G) || (mode == PAGE_CUR_GE)
|| (mode == PAGE_CUR_LE_OR_EXTENDS) || (mode == PAGE_CUR_DBG));
#ifdef PAGE_CUR_DBG
|| (mode == PAGE_CUR_DBG)
#endif /* PAGE_CUR_DBG */
#ifdef PAGE_CUR_LE_OR_EXTENDS
|| (mode == PAGE_CUR_LE_OR_EXTENDS)
#endif /* PAGE_CUR_LE_OR_EXTENDS */
|| (mode == PAGE_CUR_G) || (mode == PAGE_CUR_GE));
page_check_dir(page);
#ifdef PAGE_CUR_ADAPT
@ -261,16 +265,18 @@ page_cur_search_with_match(
return;
}
}
/*#ifdef UNIV_SEARCH_DEBUG */
# ifdef PAGE_CUR_DBG
if (mode == PAGE_CUR_DBG) {
mode = PAGE_CUR_LE;
}
/*#endif */
# endif
#endif
/* The following flag does not work for non-latin1 char sets because
cmp_full_field does not tell how many bytes matched */
#ifdef PAGE_CUR_LE_OR_EXTENDS
ut_a(mode != PAGE_CUR_LE_OR_EXTENDS);
#endif /* PAGE_CUR_LE_OR_EXTENDS */
/* If mode PAGE_CUR_G is specified, we are trying to position the
cursor to answer a query of the form "tuple < X", where tuple is
@ -308,33 +314,36 @@ page_cur_search_with_match(
cmp = cmp_dtuple_rec_with_match(tuple, mid_rec, offsets,
&cur_matched_fields,
&cur_matched_bytes);
if (cmp == 1) {
if (UNIV_LIKELY(cmp > 0)) {
low_slot_match:
low = mid;
low_matched_fields = cur_matched_fields;
low_matched_bytes = cur_matched_bytes;
} else if (cmp == -1) {
} else if (UNIV_LIKELY(cmp /* == -1 */)) {
#ifdef PAGE_CUR_LE_OR_EXTENDS
if (mode == PAGE_CUR_LE_OR_EXTENDS
&& page_cur_rec_field_extends(tuple, mid_rec,
offsets, cur_matched_fields)) {
low = mid;
low_matched_fields = cur_matched_fields;
low_matched_bytes = cur_matched_bytes;
} else {
up = mid;
up_matched_fields = cur_matched_fields;
up_matched_bytes = cur_matched_bytes;
}
} else if (mode == PAGE_CUR_G || mode == PAGE_CUR_LE
|| mode == PAGE_CUR_LE_OR_EXTENDS) {
low = mid;
low_matched_fields = cur_matched_fields;
low_matched_bytes = cur_matched_bytes;
} else {
goto low_slot_match;
}
#endif /* PAGE_CUR_LE_OR_EXTENDS */
up_slot_match:
up = mid;
up_matched_fields = cur_matched_fields;
up_matched_bytes = cur_matched_bytes;
} else if (mode == PAGE_CUR_G || mode == PAGE_CUR_LE
#ifdef PAGE_CUR_LE_OR_EXTENDS
|| mode == PAGE_CUR_LE_OR_EXTENDS
#endif /* PAGE_CUR_LE_OR_EXTENDS */
) {
goto low_slot_match;
} else {
goto up_slot_match;
}
}
@ -360,32 +369,35 @@ page_cur_search_with_match(
cmp = cmp_dtuple_rec_with_match(tuple, mid_rec, offsets,
&cur_matched_fields,
&cur_matched_bytes);
if (cmp == 1) {
if (UNIV_LIKELY(cmp > 0)) {
low_rec_match:
low_rec = mid_rec;
low_matched_fields = cur_matched_fields;
low_matched_bytes = cur_matched_bytes;
} else if (cmp == -1) {
} else if (UNIV_LIKELY(cmp /* == -1 */)) {
#ifdef PAGE_CUR_LE_OR_EXTENDS
if (mode == PAGE_CUR_LE_OR_EXTENDS
&& page_cur_rec_field_extends(tuple, mid_rec,
offsets, cur_matched_fields)) {
low_rec = mid_rec;
low_matched_fields = cur_matched_fields;
low_matched_bytes = cur_matched_bytes;
} else {
up_rec = mid_rec;
up_matched_fields = cur_matched_fields;
up_matched_bytes = cur_matched_bytes;
goto low_rec_match;
}
} else if (mode == PAGE_CUR_G || mode == PAGE_CUR_LE
|| mode == PAGE_CUR_LE_OR_EXTENDS) {
low_rec = mid_rec;
low_matched_fields = cur_matched_fields;
low_matched_bytes = cur_matched_bytes;
} else {
#endif /* PAGE_CUR_LE_OR_EXTENDS */
up_rec_match:
up_rec = mid_rec;
up_matched_fields = cur_matched_fields;
up_matched_bytes = cur_matched_bytes;
} else if (mode == PAGE_CUR_G || mode == PAGE_CUR_LE
#ifdef PAGE_CUR_LE_OR_EXTENDS
|| mode == PAGE_CUR_LE_OR_EXTENDS
#endif /* PAGE_CUR_LE_OR_EXTENDS */
) {
goto low_rec_match;
} else {
goto up_rec_match;
}
}