[mypyc] Inline tagged integer arithmetic and bitwise operations #17265
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Inline the fast path of various tagged integer operations by using C inline functions.
Most of these operations are very quick, so getting rid of the overhead of a C call
improves performance significantly. This also enables the C compiler to optimize
things more, if there are constant operands, for example.
This speeds up an older version of the richards benchmark, which didn't use native
integers, by 10% (on CPython 3.12). Even bigger improvements are possible in
some microbenchmarks.
We didn't do this in the past because of worries about compilation time. However,
I couldn't measure an impact to self-compilation speed, and the binary size is
only increased by about 0.1%.
Work on mypyc/mypyc#757.