Philip Reames 91a083c57f Carry facts about nullness and undef across GC relocation ... This change implements four basic optimizations: If a relocated value isn't used, it doesn't need to be relocated. If the value being relocated is null, relocation doesn't change that. (Technically, this might be collector specific. I don't know of one which it doesn't work for though.) If the value being relocated is undef, the relocation is meaningless. If the value being relocated was known nonnull, the relocated pointer also isn't null. (Since it points to the same source language object.) I outlined other planned work in comments. Differential Revision: http://reviews.llvm.org/D6600 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224968 91177308-0d34-0410-b5e6-96231b3b80d8		2014-12-29 23:27:30 +00:00
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llvm	Carry facts about nullness and undef across GC relocation	2014-12-29 23:27:30 +00:00
llvm-c	Finish removing DestroySource.	2014-12-23 19:16:45 +00:00