Performance fixes. #1654
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Performance fixes. #1654
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Replace % with bitwise arithmetic. This helps reduce the performance regression seen between 1.03 and master.
This is a significant performance improvement.
ben-clayton
approved these changes
Feb 27, 2018
| @@ -22,6 +22,9 @@ | |||
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| #include <unordered_map> | |||
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| static_assert((GAPIL_MIN_MAP_SIZE & (GAPIL_MIN_MAP_SIZE - 1)) == 0, "Map size must be a power of 2"); | |||
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Might be worth putting a similar assert in the compiler.
gapii/cc/BUILD.bazel
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| @@ -142,7 +142,7 @@ cc_library( | |||
| "//core/memory/arena/cc", | |||
| "//core/memory_tracker/cc", | |||
| "//core/os/device/deviceinfo/cc", | |||
| "//gapil/runtime/cc", | |||
| "//gapil/runtime/cc:cc", | |||
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Should be no need for the :cc
gapil/runtime/cc/BUILD.bazel
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| deps = [ | ||
| "//core/memory/arena/cc", | ||
| ":headers", | ||
| "//core/memory/arena/cc:cc", |
We require that they are a power of 2, otherwise we have to fall back to a slow % operator, instead of &.
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This fixes #1646.
The performance overhead of libgapii is now actually lower than it was in 1.03.