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May 24, 2017 23:53
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bit-mask and shift bits individually to lowest position.
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| def accordion_shift(value, mask): | |
| x = 0 | |
| to_bit = 0 | |
| for from_bit in range(len(bin(mask)) - 2): | |
| if (1 << from_bit) & mask: | |
| if (1 << from_bit) & value: | |
| x |= 1 << to_bit | |
| to_bit += 1 | |
| return x | |
| accordion_shift(value=0b1100, mask=0b1101) | |
| accordion_shift(value=0b100, mask=0b110) |
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