JIT: Some bitwise ops are not folded by lowering when reassociation is required

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#116,077 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
csharp
Domain
compilers

Research direction

Start by reading the example diff from #115977 and tracing the JIT lowering path involved when reassociation is required. Identify where the extra bitwise OR is introduced and the existing test or reproduction that exposes it; done means the redundant OR is no longer present in the lowered result.

Written by the indexing model from the issue text.

Description

area-CodeGen-coreclr

Example diff from #115977:

Image

We should not need two bitwise or operations here.

Dominant language
C#
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Forks
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