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additional robustness check for incremental sat solver core when it recieves interpreted constants, added PB equality to interface and special handling of equalities to adddress performance gap documented in #755

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-10-25 20:32:13 -07:00
parent fefd00aa49
commit 461e88e34c
21 changed files with 430 additions and 84 deletions
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20
src/api/python/z3/z3.py
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@ -7654,6 +7654,26 @@ def PbLe(args, k):
_coeffs[i] = coeffs[i]
return BoolRef(Z3_mk_pble(ctx.ref(), sz, _args, _coeffs, k), ctx)
def PbEq(args, k):
"""Create a Pseudo-Boolean inequality k constraint.
>>> a, b, c = Bools('a b c')
>>> f = PbEq(((a,1),(b,3),(c,2)), 3)
"""
args = _get_args(args)
args, coeffs = zip(*args)
if __debug__:
_z3_assert(len(args) > 0, "Non empty list of arguments expected")
ctx = _ctx_from_ast_arg_list(args)
if __debug__:
_z3_assert(ctx is not None, "At least one of the arguments must be a Z3 expression")
args = _coerce_expr_list(args, ctx)
_args, sz = _to_ast_array(args)
_coeffs = (ctypes.c_int * len(coeffs))()
for i in range(len(coeffs)):
_coeffs[i] = coeffs[i]
return BoolRef(Z3_mk_pbeq(ctx.ref(), sz, _args, _coeffs, k), ctx)
def solve(*args, **keywords):
"""Solve the constraints `*args`.