8000 bpo-46055: Streamline inner loop for right shifts by mdickinson · Pull Request #30243 · python/cpython · GitHub
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bpo-46055: Streamline inner loop for right shifts #30243

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Merged
merged 6 commits into from
Dec 27, 2021
Merged

bpo-46055: Streamline inner loop for right shifts #30243

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056495d
bpo-46055: Streamline inner loop for right shifts
mdickinson Dec 23, 2021
d0f1958
Move declarations to top of function; rename high to lobits
mdickinson Dec 23, 2021
f92f3f8
Now even faster!
mdickinson Dec 23, 2021
76e9a48
Remove unnecessary parentheses
mdickinson Dec 23, 2021
76dc476
Cosmetic changes to align the inner loop with that of long_lshift1
mdickinson Dec 23, 2021
08bb0bb
Merge remote-tracking branch 'upstream/main' into faster-rshift
mdickinson Dec 27, 2021
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Remove unnecessary parentheses
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@mdickinson
mdickinson committed Dec 23, 2021
commit 76e9a487c7be6525d927de99f2045259ee1e7509
2 changes: 1 addition & 1 deletion Objects/longobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4516,7 +4516,7 @@ long_rshift1(PyLongObject *a, Py_ssize_t wordshift, digit remshift)
j = wordshift;
twodigits acc = a->ob_digit[j++] >> remshift;
for (i = 0; j < Py_SIZE(a); i++, j++) {
acc |= ((twodigits)(a->ob_digit[j]) << hishift);
acc |= (twodigits)(a->ob_digit[j]) << hishift;
z->ob_digit[i] = acc & PyLong_MASK;
acc >>= PyLong_SHIFT;
}
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