Summary:
Re-worked the way ICF operates. The pass now checks for more than just
call instructions, but also for all references including function
pointers. Jump tables are handled too.
(cherry picked from FBD4372491)
Summary:
Get rid of all uses of getIndex/getLayoutIndex/getOffset outside of BinaryFunction.
Also made some other offset related methods private.
(cherry picked from FBD3861968)
Summary:
Option "-jump-tables=1" enables experimental support for jump tables.
The option hasn't been tested with optimizations other than block
re-ordering.
Only non-PIC jump tables are supported at the moment.
(cherry picked from FBD3867849)
Summary:
Add "-reorder-blocks=cluster-shuffle" for performance experiments.
Use "-bolt-seed=<N>" to set a randomization seed.
(cherry picked from FBD3851035)
Summary:
This will make it easier to run experiments with the same baseline
BOLT binary but different command line options.
(cherry picked from FBD3831978)
Summary:
We only need ClusterEdges in reordering algorithm optimized for
branches and the computation is quite resource-hungry, thus it
makes sense to only do it when needed.
Some refactoring too.
(cherry picked from FBD3721107)
Summary:
This algorithm is similar to our main clustering algorithm but uses
a different heuristic for selecting edges to become fall-throughs.
The weight of an edge is calculated as the win in branches if we choose
to layout this edge as a fall-through. For example, the edges A -> B with
execution count 100 and A -> C with execution count 500 (where B and C
are the only successors of A) have weights -400 and +400 respectively.
(cherry picked from FBD3606591)
Summary:
Use unordered_map instead of map in ReorderAlgorithm and BinaryFunction::BasicBlockIndices.
Cuts about 30sec off the processing time for the hhvm binary. (~8.5 min to ~8min)
(cherry picked from FBD3530910)
Summary:
The various reorder and clustering algorithms have been refactored
into separate classes, so that it is easier to add new algorithms and/or
change the logic of algorithm selection.
(cherry picked from FBD3473656)
