8000 bpo-44946: Streamline operators and creation of ints for common case of single 'digit'. by markshannon · Pull Request #27832 · python/cpython · GitHub
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bpo-44946: Streamline operators and creation of ints for common case of single 'digit'. #27832

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Merged
merged 17 commits into from
Aug 25, 2021
Merged

bpo-44946: Streamline operators and creation of ints for common case of single 'digit'. #27832

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da57f0b
Streamline binary operations and creating new int objects for common …
markshannon Aug 18, 2021
0533a9f
Make sure that all ints, even internal, temporary ones, have at least…
markshannon Aug 19, 2021
9349daa
Readability improvements as suggested by Victor Stinner.
markshannon Aug 19, 2021
96496e2
Prefix private function name with _
markshannon Aug 19, 2021
5e4aad5
Reduce the number of casts.
markshannon Aug 19, 2021
59ba476
Avoid casting away top bits.
markshannon Aug 19, 2021
0d3ca1d
Streamline integer negation and invert a bit. Suggested by Mark Dicki…
markshannon Aug 20, 2021
c73333b
Clarify comment and internal function name. Remove a bit of redundant…
markshannon Aug 20, 2021
16d3167
Remove two more narrowing casts.
markshannon Aug 20, 2021
f20a2a8
Change _PyLong_FromLarge to use correctly sized int.
markshannon Aug 20, 2021
ab2b908
Avoid more narrowings.
markshannon Aug 20, 2021
e43060a
Revert get_small_int to taking a sdigit. Place narrowing casts in cor…
markshannon Aug 20, 2021
ed2a430
Use _PyLong_FromSTwoDigits not PyLong_FromLong in long_add.
markshannon Aug 20, 2021
1f2d47c
Implement PyLong_FromLong separately from _PyLong_FromSTwoDigits to a…
markshannon Aug 23, 2021
649c311
Don't overflow shift in PyLong_FromLong.
markshannon Aug 23, 2021
a69f420
Convert IS_MEDIUM_INT macro to inline function.
markshannon Aug 25, 2021
47571ff
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markshannon Aug 25, 2021
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Don't overflow shift in PyLong_FromLong.
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@markshannon
markshannon committed Aug 23, 2021
commit 649c31180fbf72416cfe3d063ca592769e2cf049
5 changes: 3 additions & 2 deletions Objects/longobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -273,8 +273,9 @@ PyLong_FromLong(long ival)
if (!(abs_ival >> PyLong_SHIFT)) {
return _PyLong_FromMedium((sdigit)ival);
}
/* Must be at least two digits */
unsigned long t = abs_ival >> (PyLong_SHIFT *2);
/* Must be at least two digits.
* Do shift in two steps to avoid undefined behavior. */
unsigned long t = (abs_ival >> PyLong_SHIFT) >> PyLong_SHIFT;
Py_ssize_t ndigits = 2;
while (t) {
++ndigits;
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