def visit_float_is_infinite(self, e):
arg = e.arg(0)
self._check_fp_sort(arg)
arg_sort = arg.sort()
pos_inf = None
neg_inf = None
if self._is_float32_sort(arg_sort):
pos_inf = z3.fpPlusInfinity(z3.Float32())
neg_inf = z3.fpMinusInfinity(z3.Float32())
elif self._is_float64_sort(arg_sort):
pos_inf = z3.fpPlusInfinity(z3.Float64())
neg_inf = z3.fpMinusInfinity(z3.Float64())
else:
raise CoralPrinterException('Unhandled fp.isInfinite op case')
temp = z3.Or(z3.fpEQ(arg, pos_inf), z3.fpEQ(arg, neg_inf))
self.visit(temp)
def visit_eq(self, e):
sort = e.arg(0).sort()
if sort.kind() == z3.Z3_BOOL_SORT:
self.sio.write('BNOT(BXOR(')
self.visit(e.arg(0))
self.sio.write(',')
self.visit(e.arg(1))
self.sio.write('))')
elif sort.kind() == z3.Z3_BV_SORT:
raise NotImplementedError('BitVector equal')
self._check_bv_sort(e.arg(0))
self._check_bv_sort(e.arg(1))
elif sort.kind() == z3.Z3_FLOATING_POINT_SORT:
self._check_fp_sort(e.arg(0))
# Either FEQ or both args are NaN
# FIXME: This isn't quite right because +zero is != to -zero
# but we have no way in Coral's constraint language of distinguishing
# between them
self._unsound_translation('=')
new_expr = z3.Or(
z3.And(z3.fpIsNaN(e.arg(0)), z3.fpIsNaN(e.arg(1))),
z3.fpEQ(e.arg(0), e.arg(1)))
self.visit(new_expr)
else:
raise CoralPrinterUnsupportedSort(sort)
def _float_binary_operator(self, term, op):
x = self.eval(term.x)
y = self.eval(term.y)
if 'nnan' in term.flags:
self.add_defs(z3.Not(z3.fpIsNaN(x)), z3.Not(z3.fpIsNaN(y)),
z3.Not(z3.fpIsNaN(op(x,y))))
if 'ninf' in term.flags:
self.add_defs(z3.Not(z3.fpIsInf(x)), z3.Not(z3.fpIsInf(y)),
z3.Not(z3.fpIsInf(op(x,y))))
if 'nsz' in term.flags:
# NOTE: this will return a different qvar for each (in)direct reference
# to this term. Is this desirable?
q = self.fresh_var(self.type(term))
self.add_qvar(q) # FIXME
self.add_defs(z3.fpEQ(q,0))
z = op(x,y)
return z3.If(z3.fpEQ(z,0), q, z)
return op(x,y)
def _float_binary_operator(self, term, op):
x = self.eval(term.x)
y = self.eval(term.y)
if 'nnan' in term.flags:
self.add_defs(z3.Not(z3.fpIsNaN(x)), z3.Not(z3.fpIsNaN(y)),
z3.Not(z3.fpIsNaN(op(x, y))))
if 'ninf' in term.flags:
self.add_defs(z3.Not(z3.fpIsInf(x)), z3.Not(z3.fpIsInf(y)),
z3.Not(z3.fpIsInf(op(x, y))))
if 'nsz' in term.flags:
# NOTE: this will return a different qvar for each (in)direct reference
# to this term. Is this desirable?
q = self.fresh_var(self.type(term))
self.add_qvar(q) # FIXME
self.add_defs(z3.fpEQ(q, 0))
z = op(x, y)
return z3.If(z3.fpEQ(z, 0), q, z)
return op(x, y)
def visit_float_is_zero(self, e):
arg = e.arg(0)
self._check_fp_sort(arg)
arg_sort = arg.sort()
zero = None
# It doesn't matter if we pick +0 or -0 as we are using
# the fp.eq operator which can't distinguish them, so
# the choice of +0 is arbitrary.
if self._is_float32_sort(arg_sort):
zero = z3.fpPlusZero(z3.Float32())
elif self._is_float64_sort(arg_sort):
zero = z3.fpPlusZero(z3.Float64())
else:
raise CoralPrinterException('Unhandled fp.isZero op case')
temp = z3.fpEQ(arg, zero)
self.visit(temp)
def _op_raw_fpEQ(self, a, b):
return z3.fpEQ(a, b, ctx=self._context)
def fpUEQ(x, y):
return z3.Or(z3.fpEQ(x, y), z3.fpIsNaN(x), z3.fpIsNaN(y))
def _op_raw_fpEQ(self, a, b):
return z3.fpEQ(a, b, ctx=self._context)
def fpUEQ(x, y): return z3.Or(z3.fpEQ(x,y), z3.fpIsNaN(x), z3.fpIsNaN(y))
