tag 9e2edde0374de12a6892cc36c0c83d339234ddb8
tagger The Android Open Source Project <initial-contribution@android.com> Mon May 01 08:40:34 2017 -0700
object 26b927f9aae35767f9fff824765d48ea98a282a7

Android 7.1.2 release 11

commit 26b927f9aae35767f9fff824765d48ea98a282a7
author Alex Deymo <deymo@google.com> Wed Mar 23 15:09:50 2016 -0700
committer Alex Deymo <deymo@google.com> Fri Mar 25 17:20:54 2016 -0700
tree 6e2ec1b24af578bedbeadd13665b331c9467b1be
parent 4c4bda9464d20eb28784f5992f80d08c5747172b

Enable BCJ fiter support in xz-embedded.

BCJ (branch/call/jump) filters in XZ will convert relative jumps into
absolute addresses to increase the redundancy. Since binary code has
plenty of relative jumps, this often improves compression ratio of .xz.
Preliminary test shows an improvement of 2% in the compression ratio
when compressing ELF files, which is already around 25% compression
ratio when using xz.

This patch enables the BCJ for x86, arm and thumb code filters (the
actual data being compressed, not the supported architectures where
the filter can run). This increases the size of the .a in ~12 KiB.

Bug: 27817327
TEST=Used xz-embedded to decompress a file compressed with `xz --x86 --lzma2`

(cherry picked from commit 20e8a04716ec9eca8ea5aa4788f0cbf69a7f6842)

Change-Id: Icbfc05b711675ce26b4362218026abdcc22f368f