[llvm] [CodeGen] For ad hoc aliasing, additional regUnits are needed to fix lanemask representation (PR #139206)
Vikash Gupta via llvm-commits
llvm-commits at lists.llvm.org
Thu May 8 23:18:51 PDT 2025
https://github.com/vg0204 created https://github.com/llvm/llvm-project/pull/139206
With ad-hoc aliasing, new register unit are defined for each leaf register nodes that uniquely identifies them, alongwith an additional register unit connecting them (in the ad hoc alias graph that shows the register overlap between the aliasing leaf register nodes)
It solves the issue of using the aliasing register as the immediate subregister of a register, thus need to have disjoint lanemask, which is now possible by virtue of uniquely defined register units. At the same time, aliasing is accounted by the shared register unit, having lanemask as 0x0 just as previously, not a problem now.
It fixes #138552 and acts as an alternative solution to #79835
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