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| author | Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> | 2019-06-16 17:14:02 (GMT) |
|---|---|---|
| committer | Mark Dickinson <dickinsm@gmail.com> | 2019-06-16 17:14:02 (GMT) |
| commit | 3f3efed3315f06ca3412bc8f4506e994ab84a8b3 (patch) | |
| tree | 0021888d5c2a7e5c13ba7748dcb3f6b793ddefcc /Modules/mathmodule.c | |
| parent | 599f7ecb70f1b9714c702322b235b4d8155205ae (diff) | |
| download | cpython-3f3efed3315f06ca3412bc8f4506e994ab84a8b3.zip cpython-3f3efed3315f06ca3412bc8f4506e994ab84a8b3.tar.gz cpython-3f3efed3315f06ca3412bc8f4506e994ab84a8b3.tar.bz2 | |
Turn math.isqrt assertion into a comment to clarify its purpose. (GH-14131)
(cherry picked from commit 2dfeaa9222e2ed6b6e32faaf08e5b0f77318f0a7)
Co-authored-by: Mark Dickinson <dickinsm@gmail.com>
Diffstat (limited to 'Modules/mathmodule.c')
| -rw-r--r-- | Modules/mathmodule.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c index 76d821c..82a9a14 100644 --- a/Modules/mathmodule.c +++ b/Modules/mathmodule.c @@ -1527,10 +1527,10 @@ Here's Python code equivalent to the C implementation below: a = 1 d = 0 for s in reversed(range(c.bit_length())): + # Loop invariant: (a-1)**2 < (n >> 2*(c - d)) < (a+1)**2 e = d d = c >> s a = (a << d - e - 1) + (n >> 2*c - e - d + 1) // a - assert (a-1)**2 < n >> 2*(c - d) < (a+1)**2 return a - (a*a > n) |