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calc.py@ 1214

Last change on this file since 1214 was 1207, checked in by wouter, 2 months ago
replaced asbyte with truncate which is more general
File size: 258 bytes

Rev	Line
[1206]	1
	2
[1207]	3	def truncate(n:int, nbits: int):
[1206]	4	'''
[1207]	5	keep only the lowest nbits of n. This effectively keeps the number signed
	6	but weird things will happen if n does not fit in nbits
[1206]	7	'''
[1207]	8	half = 1<<(nbits-1)
	9	return ((n+half)& ((1<<nbits)-1)) - half

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