goldsteinn wrote:

> We happen have a back-end where we do not have conversion instructions 
> between unsigned int and FP, so this patch complicates things. Would it make 
> sense to enable this canonicalization only if the target wants it?

We try to keep InstCombine as target agnostic as possible so probably not.
Thats why I was thinking of adding the `nneg` flag, so its extremely easy for 
the backend to undo this.

If we don't go with `nneg` and its causing issues on a lot of targets, revert 
might be the right approach.

https://github.com/llvm/llvm-project/pull/82404
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