[libcxx-commits] [PATCH] D67900: [libc++] Use builtin type traits whenever possible

Zoe Carver via Phabricator via libcxx-commits libcxx-commits at lists.llvm.org
Sun Sep 22 20:36:06 PDT 2019

zoecarver created this revision.
zoecarver added reviewers: ldionne, mclow.lists, EricWF.
Herald added subscribers: libcxx-commits, dexonsmith, christof.
Herald added a project: libc++.

This patch updates <type_traits> to use builtins wherever possible. This patch should increase performance greatly. When I compiled all the type traits tests before and after, I saw a 6.6% decrease in build time.

There are a few traits who's corresponding builtins do not work properly. See the comments in code. We will have to enable these traits only after a particular version of clang where the issue has been fixed.

  rG LLVM Github Monorepo



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