[PATCH 0/4] `log -c` speedup

Hello up there,

I'm using `git log --raw` to reconstruct file dates (readonly filesystem for git archives) and, as it turned out, for --raw to emit diffs for merges we need to explicitly activate combine-diff via -c.

The combined-diff turned out to be slow, I'm trying to optimize it. Please apply.

Thanks beforehand, Kirill

Kirill Smelkov (4):
  diffcore-order: Export generic ordering interface
  diff test: Add tests for combine-diff with orderfile
  combine-diff: Optimize combine_diff_path sets intersection
  combine-diff: combine_diff_path.len is not needed anymore

 combine-diff.c        | 121 +++++++++++++++++++++++++++++++++-----------------
 diff-lib.c            |   2 -
 diff.h                |   1 -
 diffcore-order.c      |  53 ++++++++++++++--------
 diffcore.h            |  15 +++++++
 t/t4056-diff-order.sh |  21 +++++++++
 6 files changed, 151 insertions(+), 62 deletions(-)