Commit 0d665139fe51e2976f2688175232425107a61515
2018-11-18T15:47:02
Don't generate TypeInfo objects as static objects within GetTypeInfo function Generating static objects within a function results in multithread safe code. This code generates the static objects upon the first execution of the line which declares the object. This results in high runtime cost for synchronization and a bigger code size. Instead introduce a new function uint32_t GetPackedTypeInfo(GLenum type) which returns a packed representation for the Type class. This representation is usually returned in a register on the assembly level. As a result we save constant storage for the TypeInfo object and one indirection when reading any value from this object. The Type constructor accepts the packed representation and unpacks it an inline function. For fields which are not used the compiler also applies dead code elimination which reduces the cost furthermore. As a result of this change the cost of GetTypeInfo is reduced by a factor of 4-5. Bug: angleproject:2974 Change-Id: I8ed0bf2f09d087fa4cffa04f82e3b7f8c183fe30 Reviewed-on: https://chromium-review.googlesource.com/c/1340221 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>