From: Kirill Smelkov <kirr@mns.spb.ru>
Date: Thu, 27 Mar 2014 14:22:07 +0000 (+0400)
Subject: tree-diff: reuse base str(buf) memory on sub-tree recursion
X-Git-Tag: v2.1.0-rc0~201^2~4
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/12cd81743dc4645ef909b0c38582f5714c9a8ff7?hp=12cd81743dc4645ef909b0c38582f5714c9a8ff7

tree-diff: reuse base str(buf) memory on sub-tree recursion

Instead of allocating it all the time for every subtree in
ll_diff_tree_sha1, let's allocate it once in diff_tree_sha1, and then
all callee just use it in stacking style, without memory allocations.

This should be faster, and for me this change gives the following
slight speedups for

git log --raw --no-abbrev --no-renames --format='%H'

navy.git    linux.git v3.10..v3.11

before      0.618s      1.903s
after       0.611s      1.889s
speedup     1.1%        0.7%

Signed-off-by: Kirill Smelkov <kirr@mns.spb.ru>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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