Xin Tong f95d9b3c92 Change FSO heuristic. ...

FSO functions that have high potential but does not have caller inside
current module.

The thunk can then be inlined into the module calling the function and
the function would get the benefit of FSO.

The heuristic for selecting such function is
1. Have no indirect caller. This would introduce a thunk.
2. Have potential to give better performance. i.e. function argument can
be O2G.

Regression
TEST                                                    | OLD_MIN | NEW_MIN | DELTA (%) | SPEEDUP
---                                                     | ---     | ---     | ---       | ---
BenchLangCallingCFunction                               | 184     | 211     | +14.7%    | **0.87x**
Calculator                                              | 55      | 59      | +7.3%     | **0.93x**
DeadArray                                               | 687     | 741     | +7.9%     | **0.93x**
MonteCarloPi                                            | 39275   | 41669   | +6.1%     | **0.94x**

Improvement
TEST                                                    | OLD_MIN | NEW_MIN | DELTA (%) | SPEEDUP
---                                                     | ---     | ---     | ---       | ---
LuhnAlgoLazy                                            | 2478    | 2327    | -6.1%     | **1.06x**
OpenClose                                               | 54      | 51      | -5.6%     | **1.06x**
SortLettersInPlace                                      | 1016    | 946     | -6.9%     | **1.07x**
ObjectiveCBridgeFromNSDictionaryAnyObjectToStringForced | 149993  | 139755  | -6.8%     | **1.07x**
Phonebook                                               | 9666    | 8992    | -7.0%     | **1.07x**
ObjectiveCBridgeFromNSDictionaryAnyObjectToString       | 222713  | 206538  | -7.3%     | **1.08x**
LuhnAlgoEager                                           | 2393    | 2226    | -7.0%     | **1.08x**
Dictionary                                              | 1307    | 1196    | -8.5%     | **1.09x**
JSONHelperDeserialize                                   | 3808    | 3492    | -8.3%     | **1.09x**
StdlibSort                                              | 7310    | 4084    | -44.1%    | **1.79x**

I see 0.15% increase in code size for Benchmark_O.

Thanks @gottesmm for suggesting this opportunity.

rdar://25345056

2016-03-29 23:04:36 -07:00

14 KiB

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