Missing fast path in PyLong_From*() functions for compact integers

[chris-eibl]

Feature or enhancement

Proposal:

See e.g. the fast path using_PyLong_FromMedium() in PyLong_FromLong(). PyLong_FromLongLong() is almost identical.

Maybe then implement PyLong_FromSsize_t(), PyLong_FromLong() and PyLong_FromLongLong()) using a macro similar to PYLONG_FROM_UINT to get rid of the repetitive code?

PYLONG_FROM_UINT is missing the fast path for medium values, too.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

Per encouragement from @iritkatriel in #128927 (comment)

Linked PRs

• gh-129149: Add Missing fast path in PYLONG_FROM_UINT macro for compact integers #129168
• gh-129149: Create a macro PYLONG_FROM_SIGNED, and leverage it in functions  #129215
• gh-129149: Add fast path for medium-size integers in PyLong_FromSsize_t() #129301

[chris-eibl]

PyLong_FromInt32(), PyLong_FromUInt32() and PyLong_FromUInt64() could maybe use these macros, too.
They do "the same thing" in a totally different way ...