[PATCH] D67399: [ARM] Follow AACPS standard for volatile bitfields

[Diogo N. Sampaio via Phabricator via cfe-commits]

dnsampaio added a comment.

Indeed our main concern is regarding the access widths of loads. As mentioned by @rjmccall, most volatile bitfields are used to perform memory mapped I/O, and some hardware only support them with a specific access width.
The spurious load I am more than glad to leave it disable behind a command flag, so it will only appear if the user requests it. See that volatile accesses might have side effects, and for example, an I/O read counter holding an odd number could define that the data is still being processed.


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  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D67399/new/

https://reviews.llvm.org/D67399