[ACTIVITY] Weekly report for week 30

[Thomas Preudhomme]

=== Work done during this 4day week ===

* Continued looking into MCF branch prediction overload due to too
many consecutive branches:
+ managed to get reproducible results
-> was missing --buildid-dir option when invoking perf
-> above flag seems ignored if a binary with same path exists
where the initial binary was built
+ rerun again sampling only one event to confirm I get # of samples
* sampling freq = run time
-> conclusion: LLVM as good as GCC for SPEC2006 MCF, profile
different because LLVM inlines one of the hot functions
* GCC PR85434 / CVE-2018-12886: upstream review
+ finish testing and submit for external review
* LLVM PR34170:
+ address comments and commit once approved
-> most build bot failed to run the test the commit added, got
reverted before I could
+ investigate test failure -> does not fail when LLVM compiled with
GCC or in Debug mode
* Continue work on DSGHACK-25 (Support arithmetic on FileCheck regex variable):
+ hammer out syntax based on upstream feedback about what would be
desirable as FileCheck expressions
* Misc:
+ Linaro LLVM buildbot babysitting
+ upstream code review
* One day off on Friday



=== Plan for week 31 ===

* TCWG-1428 (Support arithmetic on FileCheck regex variable): address comments
+ rework patch once syntax is agreed
* Track down what causes testcase added for patch 2/3 for LLVM PR34170
* Try to reproduce perf issue mentioned above on latest perf