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Fix clog2 function to be fast and universal #289

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Fix clog2 function to be fast and universal #289

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4 changes: 2 additions & 2 deletions pymtl3/datatypes/helpers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -42,8 +42,8 @@ def zext( value, new_width ):
return new_width( value.uint() )

def clog2( N ):
assert N > 0
return int( math.ceil( math.log( N, 2 ) ) )
assert N > 0
return (N - 1).bit_length()

def sext( value, new_width ):
if isinstance( new_width, int ):
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