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| author | Aart Bik <ajcbik@google.com> | 2016-01-15 14:35:12 -0800 |
|---|---|---|
| committer | Aart Bik <ajcbik@google.com> | 2016-01-20 20:14:00 -0800 |
| commit | 3f67e692860d281858485d48a4f1f81b907f1444 (patch) | |
| tree | a14d3bdc1416dc3db74983d34a408a8b48cbce9c /compiler/optimizing/graph_visualizer.cc | |
| parent | 6aadaef35ea52506db61e463910c2520b702ca5e (diff) | |
Implemented BitCount as an intrinsic. With unit test.
Rationale:
Recognizing this important operation as an intrinsic has
various advantages:
(1) having the no-side-effects/no-throw allows for
much more GVN/LICM/BCE.
(2) Some architectures, like x86_64, provide direct
support for this operation.
Performance improvements on X86_64:
CheckersEvalBench (32-bit bitboard): 27,210KNS -> 36,798KNS = + 35%
ReversiEvalBench (64-bit bitboard): 52,562KNS -> 89,086KNS = + 69%
Change-Id: I65d549b0469b7909b12c6611cdc34a8640a5751f
Diffstat (limited to 'compiler/optimizing/graph_visualizer.cc')
0 files changed, 0 insertions, 0 deletions