Mercurial > lcfOS
comparison python/ppci/bitfun.py @ 346:3bb7dcfe5529
expanded arm target
| author | Windel Bouwman |
|---|---|
| date | Fri, 07 Mar 2014 17:05:32 +0100 |
| parents | |
| children | 98ff43cfdd36 |
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| 345:b4882ff0ed06 | 346:3bb7dcfe5529 |
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| 1 | |
| 2 | |
| 3 def rotate_right(v, n): | |
| 4 """ bit-wise Rotate right n times """ | |
| 5 mask = (2**n) - 1 | |
| 6 mask_bits = v & mask | |
| 7 return (v >> n) | (mask_bits << (32 - n)) | |
| 8 | |
| 9 def rotate_left(v, n): | |
| 10 assert n >= 0 | |
| 11 assert n < 32 | |
| 12 return rotate_right(v, 32 - n) | |
| 13 | |
| 14 |