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...nstruction class hierarchy. We have a preference for the first option, but would appreciate thoughts/opinions/discussion on the best way to insert the element atomic intrinsics into the hierarchy. For background, the relevant portion of the current hierarchy looks like: MemIntrinsic * MemSetInst * MemTransferInst ** MemCpyInst ** MemMoveInst Option 1) ------------- Do not add any new classes to the hierarchy. Instead, teach each class to recognize the unordered-atomic variant as belonging to the class (ex: element unordered-atomic memcpy is recognized as a MemCpyInst, MemTransferInst, and a MemIntrinsic...

...manifest in clang. Option 2) ------------- Add separate classes to the hierarchy for each intrinsic. There are a few different ways that this could be organized (note: UA* = unordered-atomic version of intrinsic, to save typing): a) Completely disjoint hierarchy UAMemIntrinsic * UAMemSetInst * UAMemTransferInst ** UAMemCpyInst ** UAMemMoveInst MemIntrinsic * MemSetInst * MemTransferInst ** MemCpyInst ** MemMoveInst e) Multiple inheritance This is a variant on options 2b to 2d. To make it possible to easily use isa<> to query for whether or not a memory intrinsic is unordered-atomic or not we could...

Same patches as before, but 0002-memcpy has been updated to put the (is|set)SrcVolatile methods to where they logically belong : MemTransferInst. This makes (is|set)Volatile methods look a bit ugly to keep compatibility with existing behaviour, but they will hopefully disappear when all users have moved to the new interface --- in the next series of patches. I plan to give a try to phabricator for the next patches, but could not for the ac...

Hi All, In the language reference manual, the access behavior of the memcpy, memmove and memset intrinsics is not well defined with respect to the volatile flag. The LRM even states that "it is unwise to depend on it". This forces optimization passes to be conservatively correct and prevent optimizations. A very simple example of this is : $ cat test.c #include <stdint.h>