Some floating-point stuff broke during the z3 upgrade

I just upgraded the z3 distribution to the latest version and, as per usual, it seems to have broken a few things. The following code worked before the upgrade and no longer does:

import claripy
s = claripy.Solver()
a = claripy.FPS('a', claripy.fp.FSORT_FLOAT)
s.eval(a.raw_to_bv(), 1)

Something along these lines is currently causing our CI to fail.

I would appreciate it if someone could take this issue on.

[Phat3]

I just created a PR (#145 ) that should fix all the problem that we had with the newer version of Z3.

The problem that we had was when we wanted to perform a conversion from a symbolic FP to a BV. Under the hood, angr calls the function FPToIEEE with the FP as a parameter. In the old version of z3, there was a concept of the function FPToIEE_unspecified which was special cased to 0 while in the new version this unspecified version of the function is no longer present.

Because of this, we ended up having two different models for the same constraint in the two different versions of Z3 (old version: [Sym_FP = NaN, fp.to_ieee_bv_unspecified = 0], new version: [Sym_FP = NaN]).

[github-actions[bot]]

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