bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?

[Andrea Corallo]

Mattias Engdegård <mattiase@acm.org> writes:

> This will be fixed automatically by marking + as pure; the same should be 
> done for the other arithmetic functions.

Hi,

attached the updated version of the patch updating the pure function
classification.

Please have a look.

Thanks

  Andrea

0001-Add-a-number-of-functions-to-pure-fns-bug-42147.patch
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