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combine-diff.c: fix performance problem when folding common deleted lines

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For a deleted line in a patch with the parent we are looking at, the
append_lost() function finds the same line among a run of lines that were
deleted from the same location by patches from parents we previously
checked.  This is so that patches with two parents

    @@ -1,4 +1,3 @@    @@ -1,4 +1,3 @@
     one                   one
    -two                  -two
     three                 three
    -quatro               -fyra
    +four                 +four

can be coalesced into this sequence, reusing one line that describes the
removal of "two" for both parents.

   @@@ -1,4 -1,4 +1,3 @@@
     one
   --two
     three
   - quatro
    -frya
   ++four

While reading the second patch (that removes "two" and then "fyra"), after
finding where removal of the "two" matches, we need to find existing
removal of "fyra" (if exists) in the removal list, but the match has to
happen after all the existing matches (in this case "two").  The code used
a naïve O(n^2) algorithm to compute this by scanning the whole removal
list over and over again.

This patch remembers where the next scan should be started in the existing
removal list to avoid this.

Noticed by Linus Torvalds.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2009-07-22 14:48:28 -07:00
parent 78d3b06e0f
commit 55d5d5bab7
1 changed files with 5 additions and 8 deletions
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13
combine-diff.c
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@ -80,6 +80,7 @@ struct lline {
/* Lines surviving in the merge result */
struct sline {
struct lline *lost_head, **lost_tail;
struct lline *next_lost;
char *bol;
int len;
/* bit 0 up to (N-1) are on if the parent has this line (i.e.
@ -121,18 +122,12 @@ static void append_lost(struct sline *sline, int n, const char *line, int len)
/* Check to see if we can squash things */
if (sline->lost_head) {
struct lline *last_one = NULL;
/* We cannot squash it with earlier one */
for (lline = sline->lost_head;
lline;
lline = lline->next)
if (lline->parent_map & this_mask)
last_one = lline;
lline = last_one ? last_one->next : sline->lost_head;
lline = sline->next_lost;
while (lline) {
if (lline->len == len &&
!memcmp(lline->line, line, len)) {
lline->parent_map |= this_mask;
sline->next_lost = lline->next;
return;
}
lline = lline->next;
@ -147,6 +142,7 @@ static void append_lost(struct sline *sline, int n, const char *line, int len)
lline->line[len] = 0;
*sline->lost_tail = lline;
sline->lost_tail = &lline->next;
sline->next_lost = NULL;
}
struct combine_diff_state {
@ -187,6 +183,7 @@ static void consume_line(void *state_, char *line, unsigned long len)
xcalloc(state->num_parent,
sizeof(unsigned long));
state->sline[state->nb-1].p_lno[state->n] = state->ob;
state->lost_bucket->next_lost = state->lost_bucket->lost_head;
return;
}
if (!state->lost_bucket)