Remove bitvector lib #1
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pipermerriam
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Jul 31, 2018
eth/vm/logic/arithmetic.py
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| else: | ||
| result = bit_vector.shift_left(shift_length).int_val() | ||
| result = (value * 2**shift_length) & constants.UINT_256_MAX |
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A quick test shows that replacing this with (value << shift_length) & constants.UINT_256_MAX passes all the tests.
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Indeed! I have to read up on that magic!
pipermerriam
commented
Jul 31, 2018
eth/vm/logic/arithmetic.py
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| else: | ||
| result = bit_vector.shift_right(shift_length).int_val() | ||
| result = (value // 2**shift_length) |
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This one errored out when I changed it to value >> shift_length with an overflow error saying the integer is too large to convert to the c_type, probably something that could be worked around if we're clever.
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It works with the same trick (value >> shift_length) & constants.UINT_256_MAX
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viola! huzzah for simple solutions
cburgdorf
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Jul 31, 2018
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What was wrong?
Un-necessary new library.
How was it fixed?
Figured out how to do it without the library.
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