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31 lines
585 B
31 lines
585 B
from z3 import *
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s = Solver()
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a, b = BitVecs('a b', 4)
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x = BitVec('x', 4)
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s.push()
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s.add(ForAll(x, ((x+a)^b)-a == ((x-a)^b)+a ))
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# enumerate all possible solutions:
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results=[]
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while True:
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if s.check() == sat:
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m = s.model()
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print (m)
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results.append(m)
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block = []
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block = [a != m[a].as_long(), b != m[b].as_long()]
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s.add(Or(block))
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else:
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print ("results total=", len(results))
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break
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#print(s.sexpr())
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s.pop()
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s.add(Exists(x, ((x+a)^b)-a != ((x-a)^b)+a ))
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result = s.check()
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print(result)
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print(s.sexpr())
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if result == sat:
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print(s.model())
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