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blueloveTH 2023-09-24 13:59:48 +08:00
parent ffbb9af45e
commit 2c68dd63a5
2 changed files with 7 additions and 14 deletions
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10
docs/features/long.md
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@ -8,6 +8,11 @@ Unlike cpython, pkpy's `int` is of limited precision (64-bit).
For arbitrary sized integers, we provide a builtin `long` type, just like python2's `long`.
`long` is implemented via pure python in [_long.py](https://github.com/blueloveTH/pocketpy/blob/main/python/_long.py).
!!!
This feature is still under development.
Some operations are missing, and some operations are not optimized.
!!!
### Create a long object
You can use `L` suffix to create a `long` literal from a decimal literal.
@ -25,8 +30,3 @@ a = 2L # use `L` suffix to create a `long` object
print(a ** 1000)
# 10715086071862673209484250490600018105614048117055336074437503883703510511249361224931983788156958581275946729175531468251871452856923140435984577574698574803934567774824230985421074605062371141877954182153046474983581941267398767559165543946077062914571196477686542167660429831652624386837205668069376L
```
!!!
This feature is still under development.
Some operations are missing, and some operations are not optimized.
!!!

11
python/_long.py
View File

@ -1,12 +1,5 @@
from c import sizeof
# https://www.cnblogs.com/liuchanglc/p/14203783.html
if sizeof('void_p') == 4:
PyLong_SHIFT = 28//2 - 1
elif sizeof('void_p') == 8:
PyLong_SHIFT = 60//2 - 1
else:
raise NotImplementedError
# after v1.2.2, int is always 64-bit
PyLong_SHIFT = 60//2 - 1
PyLong_BASE = 2 ** PyLong_SHIFT
PyLong_MASK = PyLong_BASE - 1