Handling aliasing memory accesses in gimple/ssa

[Kyrill Tkachov]

Hi all,

I'm taking a stab at fixing PR 22141 by merging adjacent stores into wider stores in a late gimple pass.

My current plan is to go through all the assignments in a basic block and keep track of
LHS expressions that are COMPONENT_REF, BIT_FIELD_REF, ARRAY_REF or ARRAY_RANGE_REF until
we encounter an expression that affects the recorded stores or a mergeable store that aliases with
any of the preceeding loads. My question is how to express that question in gimple/tree-ssa?

Is taking get_alias_set of the two expressions that I want to compare and
checking alias_sets_conflict_p enough?

Thanks,
Kyrill