Commit 9b00af52603a3acf05174fcf4060edd869e94ce1
2023-02-01T11:10:32
Metal: Add an in-memory MTLLibrary cache. Add a small cache for (msl + compile parameters) -> MTLLibrary at the egl::Display level. In regular executions of Chrome, the same shaders (particularly vertex) are compiled multiple times in different programs. Tested for a regular Chrome startup + open wikipedia + motionmark 1.2: 112/282 (40%) cache hits. Several different caching methods were profiled (LinkProgram perf test) - struct key with std::map : 303309 - struct key with std::unordered_map : 308090 - binary blob key with std::map : 263595 - binary blob key with std::unordered_map : 286051 - struct key + is_transparent with std::unordered_map : 304877 - struct key + is_transparent with absl::flat_hash_map : 335686 Using is_transparent allows us to search the hash map without copying the shader source string to construct the key structure. Bug: chromium:1385510 Change-Id: Ieec4ba526fe286276a4af7114d89cde32a8f9e1d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4214012 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org>