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14f2c335
2017 Mar 30
3
Well-formed @llvm.lifetime.start and @llvm.lifetime.end intrinsics
It's useful to think about lifetime.start/end as being equivalent to a
memset of undef. They effectively clobber what was there and reinitialize
it with "nothing". If you transform lifetime.start in a way that would be
incorrect if it were storing undef, then that transform is incorrect.
On Thu, Mar 30, 2017 at 4:16 PM, Daniel Berlin via llvm-dev <
llvm-dev at lists.llvm.org>