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Update is_power_of_two to not use log2 #674

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merged 2 commits into from
Feb 22, 2019
Merged

Update is_power_of_two to not use log2 #674

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a8c3c45
Update 0_beacon-chain.md
Feb 22, 2019
e1fc8a5
Update 0_beacon-chain.md
Feb 22, 2019
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5 changes: 1 addition & 4 deletions specs/core/0_beacon-chain.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1028,10 +1028,7 @@ def is_power_of_two(value: int) -> bool:
"""
Check if ``value`` is a power of two integer.
"""
if value == 0:
return False
else:
return 2**int(math.log2(value)) == value
return (value > 0) and (value & (value - 1) == 0)
```

### `int_to_bytes1`, `int_to_bytes2`, ...
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