I don't understand your example. `JSOp::BitOr` will [produce an Int32 value](https://searchfox.org/mozilla-central/rev/0b2870194375d80b54608c39060884acb758c206/js/src/jit/CacheIR.cpp#10314) in baseline. If you compile that function with `IONFLAGS=warp-snapshots`, you will see that all of the additions use `Int32AddResult`.
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I don't understand your example. `JSOp::BitOr` will [produce an Int32 value](https://searchfox.org/mozilla-central/rev/0b2870194375d80b54608c39060884acb758c206/js/src/jit/CacheIR.cpp#10314) in baseline. If you compile that function with `IONFLAGS=warp-snapshots`, you will see that all of the additions use `Int32AddResult`. In general, baseline does not produce double values unless it has to. There may be exceptions, but I can't think of any off the top of my head.