mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
26 lines
567 B
Python
26 lines
567 B
Python
from opcodes import SIGNEXTEND
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from rule import Rule
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from z3 import BitVec, BitVecVal, Extract, SignExt, UGT
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"""
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Checking the implementation of SIGNEXTEND using Z3's native SignExt and Extract
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"""
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rule = Rule()
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n_bits = 256
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x = BitVec('X', n_bits)
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def SIGNEXTEND_native(i, x):
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return SignExt(256 - 8 * i - 8, Extract(8 * i + 7, 0, x))
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for i in range(0, 32):
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rule.check(
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SIGNEXTEND(BitVecVal(i, n_bits), x),
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SIGNEXTEND_native(i, x)
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)
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i = BitVec('I', n_bits)
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rule.require(UGT(i, BitVecVal(31, n_bits)))
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rule.check(SIGNEXTEND(i, x), x)
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