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 visit_float_is_positive(self, e):
arg = e.arg(0)
self._check_fp_sort(arg)
arg_sort = e.arg(0).sort()
zero = None
# FIXME: This isn't sound. We can't distinguish +0 and -0
# in Coral's constraint language
self._unsound_translation('fp.isPositive')
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.isPositive case')
tmp = z3.fpGT(arg, zero)
self.visit(tmp)
def visit_float_is_subnormal(self, e):
arg = e.arg(0)
self._check_fp_sort(arg)
arg_sort = e.arg(0).sort()
smallest_positive_normal = self._get_smallest_positive_normal_for(
arg_sort)
largest_negative_normal = self._get_largest_negative_normal_for(
arg_sort)
temp = z3.Or(
z3.And(z3.fpLT(arg, smallest_positive_normal),
z3.fpGT(arg, z3.fpPlusZero(arg_sort))),
z3.And(z3.fpGT(arg, largest_negative_normal),
z3.fpLT(arg, z3.fpMinusZero(arg_sort))))
self.visit(temp)
def FPV(self, ast): #pylint:disable=unused-argument
val = str(ast.args[0])
sort = self._convert(ast.args[1])
if val == 'inf':
return z3.fpPlusInfinity(sort)
elif val == '-inf':
return z3.fpMinusInfinity(sort)
elif val == '0.0':
return z3.fpPlusZero(sort)
elif val == '-0.0':
return z3.fpMinusZero(sort)
elif val == 'nan':
return z3.fpNaN(sort)
else:
better_val = str(Decimal(ast.args[0]))
return z3.FPVal(better_val, sort, ctx=self._context)
def FPV(self, ast, result=None): #pylint:disable=unused-argument
val = str(ast.args[0])
sort = self._convert(ast.args[1])
if val == 'inf':
return z3.fpPlusInfinity(sort)
elif val == '-inf':
return z3.fpMinusInfinity(sort)
elif val == '0.0':
return z3.fpPlusZero(sort)
elif val == '-0.0':
return z3.fpMinusZero(sort)
elif val == 'nan':
return z3.fpNaN(sort)
else:
better_val = str(Decimal(ast.args[0]))
return z3.FPVal(better_val, sort, ctx=self._context)
def _convert(self, obj, result=None):
if type(obj) is NativeBVV:
return z3.BitVecVal(obj.value, obj.bits)
elif isinstance(obj, FSort):
return z3.FPSort(obj.exp, obj.mantissa)
elif isinstance(obj, RM):
if obj == RM_RNE:
return z3.RNE()
elif obj == RM_RNA:
return z3.RNA()
elif obj == RM_RTP:
return z3.RTP()
elif obj == RM_RTN:
return z3.RTN()
elif obj == RM_RTZ:
return z3.RTZ()
else:
raise BackendError("unrecognized rounding mode")
elif isinstance(obj, NativeFPV):
val = str(obj.value)
sort = self._convert(obj.sort)
if val == 'inf':
return z3.fpPlusInfinity(sort)
elif val == '-inf':
return z3.fpMinusInfinity(sort)
elif val == '0.0':
return z3.fpPlusZero(sort)
elif val == '-0.0':
return z3.fpMinusZero(sort)
elif val == 'nan':
return z3.fpNaN(sort)
else:
better_val = str(Decimal(obj.value))
return z3.FPVal(better_val, sort)
elif obj is True:
return z3.BoolVal(True)
elif obj is False:
return z3.BoolVal(False)
elif type(obj) in (int, long, float, str):
return obj
elif hasattr(obj, '__module__') and obj.__module__ == 'z3':
return obj
else:
l.debug("BackendZ3 encountered unexpected type %s", type(obj))
raise BackendError("unexpected type %s encountered in BackendZ3" %
type(obj))
def _convert(self, obj, result=None):
if type(obj) is NativeBVV:
return z3.BitVecVal(obj.value, obj.bits)
elif isinstance(obj, FSort):
return z3.FPSort(obj.exp, obj.mantissa)
elif isinstance(obj, RM):
if obj == RM_RNE:
return z3.RNE()
elif obj == RM_RNA:
return z3.RNA()
elif obj == RM_RTP:
return z3.RTP()
elif obj == RM_RTN:
return z3.RTN()
elif obj == RM_RTZ:
return z3.RTZ()
else:
raise BackendError("unrecognized rounding mode")
elif isinstance(obj, NativeFPV):
val = str(obj.value)
sort = self._convert(obj.sort)
if val == 'inf':
return z3.fpPlusInfinity(sort)
elif val == '-inf':
return z3.fpMinusInfinity(sort)
elif val == '0.0':
return z3.fpPlusZero(sort)
elif val == '-0.0':
return z3.fpMinusZero(sort)
elif val == 'nan':
return z3.fpNaN(sort)
else:
better_val = str(Decimal(obj.value))
return z3.FPVal(better_val, sort)
elif obj is True:
return z3.BoolVal(True)
elif obj is False:
return z3.BoolVal(False)
elif type(obj) in (int, long, float, str):
return obj
elif hasattr(obj, '__module__') and obj.__module__ == 'z3':
return obj
else:
l.debug("BackendZ3 encountered unexpected type %s", type(obj))
raise BackendError("unexpected type %s encountered in BackendZ3" % type(obj))
