rem0cmp.c:

  Add UNIV_LIKELY and UNIV_UNLIKELY hints.
  cmp_dtuple_rec_with_match(): Move condition outside loop.
  Reduce the number of comparisons per iteration.
mtr0mtr.c:
  mtr_memo_slot_release(): Add a UNIV_LIKELY hint.
  Simplify the preprocessor magic.
buf0buf.c:
  buf_page_optimistic_get_func(): Add UNIV_UNLIKELY hints.
  Introduce an exit_func label to remove duplicated error exits.

innobase/buf/buf0buf.c

@@ -1286,8 +1286,9 @@ buf_page_optimistic_get_func(
 
 	/* If AWE is used, block may have a different frame now, e.g., NULL */
 	
-	if (block->state != BUF_BLOCK_FILE_PAGE || block->frame != guess) {
-
+	if (UNIV_UNLIKELY(block->state != BUF_BLOCK_FILE_PAGE)
+			|| UNIV_UNLIKELY(block->frame != guess)) {
+	exit_func:
 		mutex_exit(&(buf_pool->mutex));
 
 		return(FALSE);
@@ -1320,19 +1321,17 @@ buf_page_optimistic_get_func(
 		fix_type = MTR_MEMO_PAGE_X_FIX;
 	}
 
-	if (!success) {
+	if (UNIV_UNLIKELY(!success)) {
 		mutex_enter(&(buf_pool->mutex));
 		
 		block->buf_fix_count--;
 #ifdef UNIV_SYNC_DEBUG
 		rw_lock_s_unlock(&(block->debug_latch));
 #endif
-		mutex_exit(&(buf_pool->mutex));
-
-		return(FALSE);
+		goto exit_func;
 	}
 
-	if (!UT_DULINT_EQ(modify_clock, block->modify_clock)) {
+	if (UNIV_UNLIKELY(!UT_DULINT_EQ(modify_clock, block->modify_clock))) {
 #ifdef UNIV_SYNC_DEBUG
 		buf_page_dbg_add_level(block->frame, SYNC_NO_ORDER_CHECK);
 #endif /* UNIV_SYNC_DEBUG */
@@ -1348,9 +1347,7 @@ buf_page_optimistic_get_func(
 #ifdef UNIV_SYNC_DEBUG
 		rw_lock_s_unlock(&(block->debug_latch));
 #endif
-		mutex_exit(&(buf_pool->mutex));
-		
-		return(FALSE);
+		goto exit_func;
 	}
 
 	mtr_memo_push(mtr, block, fix_type);
@@ -1368,7 +1365,7 @@ buf_page_optimistic_get_func(
 #ifdef UNIV_DEBUG_FILE_ACCESSES
 	ut_a(block->file_page_was_freed == FALSE);
 #endif
-	if (!accessed) {
+	if (UNIV_UNLIKELY(!accessed)) {
 		/* In the case of a first access, try to apply linear
 		read-ahead */
 

innobase/mtr/mtr0mtr.c

@@ -48,16 +48,11 @@ mtr_memo_slot_release(
 	object = slot->object;
 	type = slot->type;
 
-	if (object != NULL) {
+	if (UNIV_LIKELY(object != NULL)) {
 		if (type <= MTR_MEMO_BUF_FIX) {
 			buf_page_release((buf_block_t*)object, type, mtr);
 		} else if (type == MTR_MEMO_S_LOCK) {
 			rw_lock_s_unlock((rw_lock_t*)object);
-#ifndef UNIV_DEBUG
-		} else {
-			rw_lock_x_unlock((rw_lock_t*)object);
-		}
-#endif
 #ifdef UNIV_DEBUG
 		} else if (type == MTR_MEMO_X_LOCK) {
 			rw_lock_x_unlock((rw_lock_t*)object);
@@ -65,9 +60,12 @@ mtr_memo_slot_release(
 			ut_ad(type == MTR_MEMO_MODIFY);
 			ut_ad(mtr_memo_contains(mtr, object,
 						MTR_MEMO_PAGE_X_FIX));
-		}
+#else
+		} else {
+			rw_lock_x_unlock((rw_lock_t*)object);
 #endif
 		}
+	}
 
 	slot->object = NULL;
 }

innobase/rem/rem0cmp.c

@@ -451,6 +451,20 @@ cmp_dtuple_rec_with_match(
 	ut_ad(cur_field <= dtuple_get_n_fields_cmp(dtuple));
 	ut_ad(cur_field <= rec_offs_n_fields(offsets));
 
+	if (cur_bytes == 0 && cur_field == 0) {
+		ulint	rec_info = rec_get_info_bits(rec,
+				rec_offs_comp(offsets));
+		ulint	tup_info = dtuple_get_info_bits(dtuple);
+
+		if (rec_info & REC_INFO_MIN_REC_FLAG) {
+			ret = !(tup_info & REC_INFO_MIN_REC_FLAG);
+			goto order_resolved;
+		} else if (tup_info & REC_INFO_MIN_REC_FLAG) {
+			ret = -1;
+			goto order_resolved;
+		}
+	}
+
 	/* Match fields in a loop; stop if we run out of fields in dtuple
 	or find an externally stored field */
 
@@ -469,32 +483,7 @@ cmp_dtuple_rec_with_match(
 		the predefined minimum record, or the field is externally
 		stored */
 
-		if (cur_bytes == 0) {
-			if (cur_field == 0) {
-
-				if (rec_get_info_bits(rec,
-						rec_offs_comp(offsets))
-				    & REC_INFO_MIN_REC_FLAG) {
-
-					if (dtuple_get_info_bits(dtuple)
-				    	    & REC_INFO_MIN_REC_FLAG) {
-
-				    		ret = 0;
-				    	} else {
-				    		ret = 1;
-				    	}
-
-					goto order_resolved;
-				}
-
-				if (dtuple_get_info_bits(dtuple)
-				    & REC_INFO_MIN_REC_FLAG) {
- 				    	ret = -1;
-
-					goto order_resolved;
-				}
-			}
-
+		if (UNIV_LIKELY(cur_bytes == 0)) {
 			if (rec_offs_nth_extern(offsets, cur_field)) {
 				/* We do not compare to an externally
 				stored field */
@@ -504,24 +493,20 @@ cmp_dtuple_rec_with_match(
 				goto order_resolved;
 			}
 
-		    	if (dtuple_f_len == UNIV_SQL_NULL
-		            || rec_f_len == UNIV_SQL_NULL) {
-
-				if (dtuple_f_len == rec_f_len) {
+		    	if (dtuple_f_len == UNIV_SQL_NULL) {
+				if (rec_f_len == UNIV_SQL_NULL) {
 
 					goto next_field;
 				}
 
-				if (rec_f_len == UNIV_SQL_NULL) {
+				ret = -1;
+				goto order_resolved;
+			} else if (rec_f_len == UNIV_SQL_NULL) {
 				/* We define the SQL null to be the
 				smallest possible value of a field
 				in the alphabetical order */
 
 				ret = 1;
-				} else {
-					ret = -1;
-				}
-
 				goto order_resolved;
 			}
 		}
@@ -555,7 +540,7 @@ cmp_dtuple_rec_with_match(
 		/* Compare then the fields */		
 		
 		for (;;) {
-			if (rec_f_len <= cur_bytes) {
+			if (UNIV_UNLIKELY(rec_f_len <= cur_bytes)) {
 				if (dtuple_f_len <= cur_bytes) {
 
 					goto next_field;
@@ -572,7 +557,7 @@ cmp_dtuple_rec_with_match(
 				rec_byte = *rec_b_ptr;
 			}
 
-			if (dtuple_f_len <= cur_bytes) {
+			if (UNIV_UNLIKELY(dtuple_f_len <= cur_bytes)) {
 				dtuple_byte = dtype_get_pad_char(cur_type);
 
 				if (dtuple_byte == ULINT_UNDEFINED) {
@@ -601,13 +586,15 @@ cmp_dtuple_rec_with_match(
 				dtuple_byte = cmp_collate(dtuple_byte);
 			}
 
-			if (dtuple_byte > rec_byte) {
-				ret = 1;
-				goto order_resolved;
-
-			} else if (dtuple_byte < rec_byte) {
+			ret = dtuple_byte - rec_byte;
+			if (UNIV_UNLIKELY(ret)) {
+				if (ret < 0) {
 					ret = -1;
 					goto order_resolved;
+				} else {
+					ret = 1;
+					goto order_resolved;
+				}
 			}
 		next_byte:
 			/* Next byte */
@@ -983,12 +970,8 @@ cmp_debug_dtuple_rec_with_match(
 		if (rec_get_info_bits(rec, rec_offs_comp(offsets))
 					& REC_INFO_MIN_REC_FLAG) {
 
-			if (dtuple_get_info_bits(dtuple)
-				    	    & REC_INFO_MIN_REC_FLAG) {
-				ret = 0;
-			} else {
-				ret = 1;
-			}
+			ret = !(dtuple_get_info_bits(dtuple)
+				    	    & REC_INFO_MIN_REC_FLAG);
 
 			goto order_resolved;
 		}