urnathan wrote:

> Also, please have a look at the existing `-ffine-grained-bitfield-accesses` 
> flag and the discussions around it and IPO.

That flag's behaviour is unchanged here -- it continues to not merge access 
units. My contention here is that (a) merging units can be advantageous, but 
(b) the existing algorithm has some deficiencies.

https://github.com/llvm/llvm-project/pull/65742
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