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| author | buzbee <buzbee@google.com> | 2016-02-24 14:24:24 -0800 |
|---|---|---|
| committer | buzbee <buzbee@google.com> | 2016-02-25 05:47:09 -0800 |
| commit | f1dcaccfac4a9e022ea49752a774552b2f791489 (patch) | |
| tree | 2e11cbb0bead0b24dd527f307a58a0588e707901 /compiler/driver/compiler_driver_test.cc | |
| parent | db11e7ecc9c902ffde6336c261fe236299a81944 (diff) | |
ART: Profile all branches for on-stack replacement
Change the switch, goto and mterp interpreters to profile
not-taken as well as taken branches. This allows for on-stack
replacement when the cfg has been rearranged such that the loop
header was originally the fallthrough of a Dalvik byte-code branch.
Note that this increases the already-heavy cost of branch profiling.
Measuring on a Nexus 6 using a very branchy benchmark (logic subtest
from Caffeinemark), we see:
No profiling Taken only Taken & not-taken
mterp 9728 3434 2384
C++ goto 3914 2422 2037
C++ switch 2986 2411 2112
As measured, the cost of branch profiling is dominating execution
time. This will be addressed in follow-up CLs.
Change-Id: Ibc858f317398dd991ed8e4f3c3d72bd4c9a60594
Diffstat (limited to 'compiler/driver/compiler_driver_test.cc')
0 files changed, 0 insertions, 0 deletions