tree d962ba5feb37ab5cb765bd773355e8d3045fe48f
parent 95decc39b55517684c798b4ba4ce1e4142a25306
author Serge Guelton <sguelton@redhat.com> 1550050282 +0000
committer Serge Guelton <sguelton@redhat.com> 1550050282 +0000

Make llvm::Optional<T> trivially copyable when T is trivially copyable

This is an ever-recurring issue (see https://bugs.llvm.org/show_bug.cgi?id=39427 and https://bugs.llvm.org/show_bug.cgi?id=35978)
but I believe that thanks to https://reviews.llvm.org/D54472 we can now ship a decent implementation of this.

Basically the fact that llvm::is_trivially_copyable has a consistent behavior across compilers should prevent any ABI issue,
and using in-place new instead of memcpy should keep compiler bugs away.

Differential Revision: https://reviews.llvm.org/D57097


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353927 91177308-0d34-0410-b5e6-96231b3b80d8