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| author | Victor Stinner <vstinner@python.org> | 2022-01-21 23:54:42 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-01-21 23:54:42 (GMT) |
| commit | cd8de40b3b10311de2db7b90abdf80af9e35535f (patch) | |
| tree | daafa4d41120a0022e2acdf727f0b4fa077fdb79 | |
| parent | ac1f152421fab3ac854fe4565c575b306e2bb4b5 (diff) | |
| download | cpython-cd8de40b3b10311de2db7b90abdf80af9e35535f.zip cpython-cd8de40b3b10311de2db7b90abdf80af9e35535f.tar.gz cpython-cd8de40b3b10311de2db7b90abdf80af9e35535f.tar.bz2 | |
bpo-29882: _Py_popcount32() doesn't need 64x64 multiply (GH-30774)
32x32 bits multiply is enough for _Py_popcount32().
| -rw-r--r-- | Include/internal/pycore_bitutils.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Include/internal/pycore_bitutils.h b/Include/internal/pycore_bitutils.h index e4aa7a3..3fd70b0 100644 --- a/Include/internal/pycore_bitutils.h +++ b/Include/internal/pycore_bitutils.h @@ -125,7 +125,7 @@ _Py_popcount32(uint32_t x) // Put count of each 8 bits into those 8 bits x = (x + (x >> 4)) & M4; // Sum of the 4 byte counts - return (uint32_t)((uint64_t)x * (uint64_t)SUM) >> 24; + return (x * SUM) >> 24; #endif } |