[dzaima]

Alive2 does not handle loops; don't know what exactly it does by default, but changing the `shl i32 %and, 1` to `shl i32 %and, 2` has it still report the transformation as valid. You can add `--src-unroll=2` for it to check up to two loop iterations, which does catch such an error (and does still report the original as valid), but of course that's quite limited. (maybe the default is like `--src-unroll=1`?)

[gfaster]

Oh wow nice catch - I was not at all familiar with the limitations. I would've hoped for a warning there, but I suppose it is a research project.

I was able to get it working with unrolling and narrower integers:

https://alive2.llvm.org/ce/#z:OYLghAFBqd5QCxAYwPYBMCmBRdBLAF...