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|
import sys
from rpython.jit.metainterp.history import ConstInt
from rpython.jit.metainterp.optimize import InvalidLoop
from rpython.jit.metainterp.optimizeopt.intutils import (IntBound,
IntLowerBound, IntUpperBound, ConstIntBound)
from rpython.jit.metainterp.optimizeopt.optimizer import (Optimization, CONST_1,
CONST_0)
from rpython.jit.metainterp.optimizeopt.util import make_dispatcher_method
from rpython.jit.metainterp.resoperation import rop
from rpython.jit.metainterp.optimizeopt import vstring
from rpython.jit.codewriter.effectinfo import EffectInfo
from rpython.rlib.rarithmetic import intmask
def get_integer_min(is_unsigned, byte_size):
if is_unsigned:
return 0
else:
return -(1 << ((byte_size << 3) - 1))
def get_integer_max(is_unsigned, byte_size):
if is_unsigned:
return (1 << (byte_size << 3)) - 1
else:
return (1 << ((byte_size << 3) - 1)) - 1
class OptIntBounds(Optimization):
"""Keeps track of the bounds placed on integers by guards and remove
redundant guards"""
def propagate_forward(self, op):
return dispatch_opt(self, op)
def propagate_postprocess(self, op):
return dispatch_postprocess(self, op)
def propagate_bounds_backward(self, box):
# FIXME: This takes care of the instruction where box is the result
# but the bounds produced by all instructions where box is
# an argument might also be tighten
b = self.getintbound(box)
if b.has_lower and b.has_upper and b.lower == b.upper:
self.make_constant_int(box, b.lower)
box1 = self.optimizer.as_operation(box)
if box1 is not None:
dispatch_bounds_ops(self, box1)
def _optimize_guard_true_false_value(self, op):
return self.emit(op)
def _postprocess_guard_true_false_value(self, op):
if op.getarg(0).type == 'i':
self.propagate_bounds_backward(op.getarg(0))
optimize_GUARD_TRUE = _optimize_guard_true_false_value
optimize_GUARD_FALSE = _optimize_guard_true_false_value
optimize_GUARD_VALUE = _optimize_guard_true_false_value
postprocess_GUARD_TRUE = _postprocess_guard_true_false_value
postprocess_GUARD_FALSE = _postprocess_guard_true_false_value
postprocess_GUARD_VALUE = _postprocess_guard_true_false_value
def optimize_INT_OR_or_XOR(self, op):
v1 = self.get_box_replacement(op.getarg(0))
v2 = self.get_box_replacement(op.getarg(1))
if v1 is v2:
if op.getopnum() == rop.INT_OR:
self.make_equal_to(op, v1)
else:
self.make_constant_int(op, 0)
return None
return self.emit(op)
def postprocess_INT_OR_or_XOR(self, op):
v1 = self.get_box_replacement(op.getarg(0))
b1 = self.getintbound(v1)
v2 = self.get_box_replacement(op.getarg(1))
b2 = self.getintbound(v2)
b = b1.or_bound(b2)
self.getintbound(op).intersect(b)
optimize_INT_OR = optimize_INT_OR_or_XOR
optimize_INT_XOR = optimize_INT_OR_or_XOR
postprocess_INT_OR = postprocess_INT_OR_or_XOR
postprocess_INT_XOR = postprocess_INT_OR_or_XOR
def optimize_INT_AND(self, op):
return self.emit(op)
def postprocess_INT_AND(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
b = b1.and_bound(b2)
self.getintbound(op).intersect(b)
def optimize_INT_SUB(self, op):
return self.emit(op)
def postprocess_INT_SUB(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
b = b1.sub_bound(b2)
if b.bounded():
self.getintbound(op).intersect(b)
def optimize_INT_ADD(self, op):
arg1 = self.get_box_replacement(op.getarg(0))
arg2 = self.get_box_replacement(op.getarg(1))
if self.is_raw_ptr(arg1) or self.is_raw_ptr(arg2):
return self.emit(op)
v1 = self.getintbound(arg1)
v2 = self.getintbound(arg2)
# Optimize for addition chains in code "b = a + 1; c = b + 1" by
# detecting the int_add chain, and swapping with "b = a + 1;
# c = a + 2". If b is not used elsewhere, the backend eliminates
# it.
# either v1 or v2 can be a constant, swap the arguments around if
# v1 is the constant
if v1.is_constant():
arg1, arg2 = arg2, arg1
v1, v2 = v2, v1
# if both are constant, the pure optimization will deal with it
if v2.is_constant() and not v1.is_constant():
arg1 = self.optimizer.as_operation(arg1)
if arg1 is not None:
if arg1.getopnum() == rop.INT_ADD:
prod_arg1 = self.get_box_replacement(arg1.getarg(0))
prod_arg2 = self.get_box_replacement(arg1.getarg(1))
prod_v1 = self.getintbound(prod_arg1)
prod_v2 = self.getintbound(prod_arg2)
# same thing here: prod_v1 or prod_v2 can be a
# constant
if prod_v1.is_constant():
prod_arg1, prod_arg2 = prod_arg2, prod_arg1
prod_v1, prod_v2 = prod_v2, prod_v1
if prod_v2.is_constant():
sum = intmask(arg2.getint() + prod_arg2.getint())
arg1 = prod_arg1
arg2 = ConstInt(sum)
op = self.replace_op_with(op, rop.INT_ADD, args=[arg1, arg2])
return self.emit(op)
def postprocess_INT_ADD(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
r = self.getintbound(op)
b = b1.add_bound(b2)
if b.bounded():
r.intersect(b)
def optimize_INT_MUL(self, op):
return self.emit(op)
def postprocess_INT_MUL(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
r = self.getintbound(op)
b = b1.mul_bound(b2)
if b.bounded():
r.intersect(b)
def optimize_CALL_PURE_I(self, op):
return self.emit(op)
def postprocess_CALL_PURE_I(self, op):
# dispatch based on 'oopspecindex' to a method that handles
# specifically the given oopspec call.
effectinfo = op.getdescr().get_extra_info()
oopspecindex = effectinfo.oopspecindex
if oopspecindex == EffectInfo.OS_INT_PY_DIV:
self.post_call_INT_PY_DIV(op)
elif oopspecindex == EffectInfo.OS_INT_PY_MOD:
self.post_call_INT_PY_MOD(op)
def post_call_INT_PY_DIV(self, op):
b1 = self.getintbound(op.getarg(1))
b2 = self.getintbound(op.getarg(2))
r = self.getintbound(op)
r.intersect(b1.py_div_bound(b2))
def post_call_INT_PY_MOD(self, op):
b1 = self.getintbound(op.getarg(1))
b2 = self.getintbound(op.getarg(2))
r = self.getintbound(op)
r.intersect(b1.mod_bound(b2))
def optimize_INT_LSHIFT(self, op):
return self.emit(op)
def postprocess_INT_LSHIFT(self, op):
arg0 = self.get_box_replacement(op.getarg(0))
b1 = self.getintbound(arg0)
arg1 = self.get_box_replacement(op.getarg(1))
b2 = self.getintbound(arg1)
r = self.getintbound(op)
b = b1.lshift_bound(b2)
r.intersect(b)
# intbound.lshift_bound checks for an overflow and if the
# lshift can be proven not to overflow sets b.has_upper and
# b.has_lower
if b.has_lower and b.has_upper:
# Synthesize the reverse op for optimize_default to reuse
self.pure_from_args(rop.INT_RSHIFT,
[op, arg1], arg0)
def optimize_INT_RSHIFT(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
b = b1.rshift_bound(b2)
if b.has_lower and b.has_upper and b.lower == b.upper:
# constant result (likely 0, for rshifts that kill all bits)
self.make_constant_int(op, b.lower)
return None
return self.emit(op)
def postprocess_INT_RSHIFT(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
b = b1.rshift_bound(b2)
r = self.getintbound(op)
r.intersect(b)
def optimize_GUARD_NO_OVERFLOW(self, op):
lastop = self.last_emitted_operation
if lastop is not None:
opnum = lastop.getopnum()
args = lastop.getarglist()
result = lastop
# If the INT_xxx_OVF was replaced with INT_xxx or removed
# completely, then we can kill the GUARD_NO_OVERFLOW.
if (opnum != rop.INT_ADD_OVF and
opnum != rop.INT_SUB_OVF and
opnum != rop.INT_MUL_OVF):
return
# Else, synthesize the non overflowing op for optimize_default to
# reuse, as well as the reverse op
elif opnum == rop.INT_ADD_OVF:
#self.pure(rop.INT_ADD, args[:], result)
self.pure_from_args(rop.INT_SUB, [result, args[1]], args[0])
self.pure_from_args(rop.INT_SUB, [result, args[0]], args[1])
elif opnum == rop.INT_SUB_OVF:
#self.pure(rop.INT_SUB, args[:], result)
self.pure_from_args(rop.INT_ADD, [result, args[1]], args[0])
self.pure_from_args(rop.INT_SUB, [args[0], result], args[1])
#elif opnum == rop.INT_MUL_OVF:
# self.pure(rop.INT_MUL, args[:], result)
return self.emit(op)
def optimize_GUARD_OVERFLOW(self, op):
# If INT_xxx_OVF was replaced by INT_xxx, *but* we still see
# GUARD_OVERFLOW, then the loop is invalid.
lastop = self.last_emitted_operation
if lastop is None:
return # e.g. beginning of the loop
opnum = lastop.getopnum()
if opnum not in (rop.INT_ADD_OVF, rop.INT_SUB_OVF, rop.INT_MUL_OVF):
raise InvalidLoop('An INT_xxx_OVF was proven not to overflow but' +
'guarded with GUARD_OVERFLOW')
return self.emit(op)
def optimize_INT_ADD_OVF(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
resbound = b1.add_bound(b2)
if resbound.bounded():
# Transform into INT_ADD. The following guard will be killed
# by optimize_GUARD_NO_OVERFLOW; if we see instead an
# optimize_GUARD_OVERFLOW, then InvalidLoop.
# NB: this case also takes care of int_add_ovf with 0 as on of the
# arguments: the result will be bounded, and then the optimization
# for int_add with 0 as argument will remove the op.
op = self.replace_op_with(op, rop.INT_ADD)
return self.emit(op)
def postprocess_INT_ADD_OVF(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
resbound = b1.add_bound(b2)
r = self.getintbound(op)
r.intersect(resbound)
def optimize_INT_SUB_OVF(self, op):
arg0 = self.get_box_replacement(op.getarg(0))
arg1 = self.get_box_replacement(op.getarg(1))
b0 = self.getintbound(arg0)
b1 = self.getintbound(arg1)
if arg0.same_box(arg1):
self.make_constant_int(op, 0)
return None
resbound = b0.sub_bound(b1)
if resbound.bounded():
# this case takes care of int_sub_ovf(x, 0) as well
op = self.replace_op_with(op, rop.INT_SUB)
return self.emit(op)
def postprocess_INT_SUB_OVF(self, op):
arg0 = self.get_box_replacement(op.getarg(0))
arg1 = self.get_box_replacement(op.getarg(1))
b0 = self.getintbound(arg0)
b1 = self.getintbound(arg1)
resbound = b0.sub_bound(b1)
r = self.getintbound(op)
r.intersect(resbound)
def optimize_INT_MUL_OVF(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
resbound = b1.mul_bound(b2)
if resbound.bounded():
# this case also takes care of multiplication with 0 and 1
op = self.replace_op_with(op, rop.INT_MUL)
return self.emit(op)
def postprocess_INT_MUL_OVF(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
resbound = b1.mul_bound(b2)
r = self.getintbound(op)
r.intersect(resbound)
def optimize_INT_LT(self, op):
arg1 = self.get_box_replacement(op.getarg(0))
arg2 = self.get_box_replacement(op.getarg(1))
b1 = self.getintbound(arg1)
b2 = self.getintbound(arg2)
if b1.known_lt(b2):
self.make_constant_int(op, 1)
elif b1.known_ge(b2) or arg1 is arg2:
self.make_constant_int(op, 0)
else:
return self.emit(op)
def optimize_INT_GT(self, op):
arg1 = self.get_box_replacement(op.getarg(0))
arg2 = self.get_box_replacement(op.getarg(1))
b1 = self.getintbound(arg1)
b2 = self.getintbound(arg2)
if b1.known_gt(b2):
self.make_constant_int(op, 1)
elif b1.known_le(b2) or arg1 is arg2:
self.make_constant_int(op, 0)
else:
return self.emit(op)
def optimize_INT_LE(self, op):
arg1 = self.get_box_replacement(op.getarg(0))
arg2 = self.get_box_replacement(op.getarg(1))
b1 = self.getintbound(arg1)
b2 = self.getintbound(arg2)
if b1.known_le(b2) or arg1 is arg2:
self.make_constant_int(op, 1)
elif b1.known_gt(b2):
self.make_constant_int(op, 0)
else:
return self.emit(op)
def optimize_INT_GE(self, op):
arg1 = self.get_box_replacement(op.getarg(0))
arg2 = self.get_box_replacement(op.getarg(1))
b1 = self.getintbound(arg1)
b2 = self.getintbound(arg2)
if b1.known_ge(b2) or arg1 is arg2:
self.make_constant_int(op, 1)
elif b1.known_lt(b2):
self.make_constant_int(op, 0)
else:
return self.emit(op)
def optimize_INT_EQ(self, op):
arg0 = self.get_box_replacement(op.getarg(0))
b1 = self.getintbound(arg0)
arg1 = self.get_box_replacement(op.getarg(1))
b2 = self.getintbound(arg1)
if b1.known_gt(b2):
self.make_constant_int(op, 0)
elif b1.known_lt(b2):
self.make_constant_int(op, 0)
elif arg0.same_box(arg1):
self.make_constant_int(op, 1)
else:
return self.emit(op)
def optimize_INT_NE(self, op):
arg0 = self.get_box_replacement(op.getarg(0))
b1 = self.getintbound(arg0)
arg1 = self.get_box_replacement(op.getarg(1))
b2 = self.getintbound(arg1)
if b1.known_gt(b2):
self.make_constant_int(op, 1)
elif b1.known_lt(b2):
self.make_constant_int(op, 1)
elif arg0 is arg1:
self.make_constant_int(op, 0)
else:
return self.emit(op)
def optimize_INT_FORCE_GE_ZERO(self, op):
b = self.getintbound(op.getarg(0))
if b.known_nonnegative():
self.make_equal_to(op, op.getarg(0))
else:
return self.emit(op)
def optimize_INT_SIGNEXT(self, op):
b = self.getintbound(op.getarg(0))
numbits = op.getarg(1).getint() * 8
start = -(1 << (numbits - 1))
stop = 1 << (numbits - 1)
bounds = IntBound(start, stop - 1)
if bounds.contains_bound(b):
self.make_equal_to(op, op.getarg(0))
else:
return self.emit(op)
def postprocess_INT_SIGNEXT(self, op):
numbits = op.getarg(1).getint() * 8
start = -(1 << (numbits - 1))
stop = 1 << (numbits - 1)
bounds = IntBound(start, stop - 1)
bres = self.getintbound(op)
bres.intersect(bounds)
def optimize_ARRAYLEN_GC(self, op):
return self.emit(op)
def postprocess_ARRAYLEN_GC(self, op):
array = self.ensure_ptr_info_arg0(op)
self.optimizer.setintbound(op, array.getlenbound(None))
def optimize_STRLEN(self, op):
return self.emit(op)
def postprocess_STRLEN(self, op):
self.make_nonnull_str(op.getarg(0), vstring.mode_string)
array = self.getptrinfo(op.getarg(0))
self.optimizer.setintbound(op, array.getlenbound(vstring.mode_string))
def optimize_UNICODELEN(self, op):
return self.emit(op)
def postprocess_UNICODELEN(self, op):
self.make_nonnull_str(op.getarg(0), vstring.mode_unicode)
array = self.getptrinfo(op.getarg(0))
self.optimizer.setintbound(op, array.getlenbound(vstring.mode_unicode))
def optimize_STRGETITEM(self, op):
return self.emit(op)
def postprocess_STRGETITEM(self, op):
v1 = self.getintbound(op)
v2 = self.getptrinfo(op.getarg(0))
intbound = self.getintbound(op.getarg(1))
if (intbound.has_lower and v2 is not None and
v2.getlenbound(vstring.mode_string) is not None):
lb = IntLowerBound(intbound.lower + 1)
v2.getlenbound(vstring.mode_string).make_ge(lb)
v1.make_ge(IntLowerBound(0))
v1.make_lt(IntUpperBound(256))
def optimize_GETFIELD_RAW_I(self, op):
return self.emit(op)
def postprocess_GETFIELD_RAW_I(self, op):
descr = op.getdescr()
if descr.is_integer_bounded():
b1 = self.getintbound(op)
b1.make_ge(IntLowerBound(descr.get_integer_min()))
b1.make_le(IntUpperBound(descr.get_integer_max()))
optimize_GETFIELD_RAW_F = optimize_GETFIELD_RAW_I
optimize_GETFIELD_RAW_R = optimize_GETFIELD_RAW_I
optimize_GETFIELD_GC_I = optimize_GETFIELD_RAW_I
optimize_GETFIELD_GC_R = optimize_GETFIELD_RAW_I
optimize_GETFIELD_GC_F = optimize_GETFIELD_RAW_I
postprocess_GETFIELD_RAW_F = postprocess_GETFIELD_RAW_I
postprocess_GETFIELD_RAW_R = postprocess_GETFIELD_RAW_I
postprocess_GETFIELD_GC_I = postprocess_GETFIELD_RAW_I
postprocess_GETFIELD_GC_R = postprocess_GETFIELD_RAW_I
postprocess_GETFIELD_GC_F = postprocess_GETFIELD_RAW_I
optimize_GETINTERIORFIELD_GC_I = optimize_GETFIELD_RAW_I
optimize_GETINTERIORFIELD_GC_R = optimize_GETFIELD_RAW_I
optimize_GETINTERIORFIELD_GC_F = optimize_GETFIELD_RAW_I
postprocess_GETINTERIORFIELD_GC_I = postprocess_GETFIELD_RAW_I
postprocess_GETINTERIORFIELD_GC_R = postprocess_GETFIELD_RAW_I
postprocess_GETINTERIORFIELD_GC_F = postprocess_GETFIELD_RAW_I
def optimize_GETARRAYITEM_RAW_I(self, op):
return self.emit(op)
def postprocess_GETARRAYITEM_RAW_I(self, op):
descr = op.getdescr()
if descr and descr.is_item_integer_bounded():
intbound = self.getintbound(op)
intbound.make_ge(IntLowerBound(descr.get_item_integer_min()))
intbound.make_le(IntUpperBound(descr.get_item_integer_max()))
optimize_GETARRAYITEM_RAW_F = optimize_GETARRAYITEM_RAW_I
optimize_GETARRAYITEM_GC_I = optimize_GETARRAYITEM_RAW_I
optimize_GETARRAYITEM_GC_F = optimize_GETARRAYITEM_RAW_I
optimize_GETARRAYITEM_GC_R = optimize_GETARRAYITEM_RAW_I
postprocess_GETARRAYITEM_RAW_F = postprocess_GETARRAYITEM_RAW_I
postprocess_GETARRAYITEM_GC_I = postprocess_GETARRAYITEM_RAW_I
postprocess_GETARRAYITEM_GC_F = postprocess_GETARRAYITEM_RAW_I
postprocess_GETARRAYITEM_GC_R = postprocess_GETARRAYITEM_RAW_I
def optimize_UNICODEGETITEM(self, op):
return self.emit(op)
def postprocess_UNICODEGETITEM(self, op):
b1 = self.getintbound(op)
b1.make_ge(IntLowerBound(0))
v2 = self.getptrinfo(op.getarg(0))
intbound = self.getintbound(op.getarg(1))
if (intbound.has_lower and v2 is not None and
v2.getlenbound(vstring.mode_unicode) is not None):
lb = IntLowerBound(intbound.lower + 1)
v2.getlenbound(vstring.mode_unicode).make_ge(lb)
def make_int_lt(self, box1, box2):
b1 = self.getintbound(box1)
b2 = self.getintbound(box2)
if b1.make_lt(b2):
self.propagate_bounds_backward(box1)
if b2.make_gt(b1):
self.propagate_bounds_backward(box2)
def make_int_le(self, box1, box2):
b1 = self.getintbound(box1)
b2 = self.getintbound(box2)
if b1.make_le(b2):
self.propagate_bounds_backward(box1)
if b2.make_ge(b1):
self.propagate_bounds_backward(box2)
def make_int_gt(self, box1, box2):
self.make_int_lt(box2, box1)
def make_int_ge(self, box1, box2):
self.make_int_le(box2, box1)
def propagate_bounds_INT_LT(self, op):
r = self.getintbound(op)
if r.is_constant():
if r.getint() == 1:
self.make_int_lt(op.getarg(0), op.getarg(1))
else:
assert r.getint() == 0
self.make_int_ge(op.getarg(0), op.getarg(1))
def propagate_bounds_INT_GT(self, op):
r = self.getintbound(op)
if r.is_constant():
if r.getint() == 1:
self.make_int_gt(op.getarg(0), op.getarg(1))
else:
assert r.getint() == 0
self.make_int_le(op.getarg(0), op.getarg(1))
def propagate_bounds_INT_LE(self, op):
r = self.getintbound(op)
if r.is_constant():
if r.getint() == 1:
self.make_int_le(op.getarg(0), op.getarg(1))
else:
assert r.getint() == 0
self.make_int_gt(op.getarg(0), op.getarg(1))
def propagate_bounds_INT_GE(self, op):
r = self.getintbound(op)
if r.is_constant():
if r.getint() == 1:
self.make_int_ge(op.getarg(0), op.getarg(1))
else:
assert r.getint() == 0
self.make_int_lt(op.getarg(0), op.getarg(1))
def propagate_bounds_INT_EQ(self, op):
r = self.getintbound(op)
if r.is_constant():
if r.equal(1):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
if b1.intersect(b2):
self.propagate_bounds_backward(op.getarg(0))
if b2.intersect(b1):
self.propagate_bounds_backward(op.getarg(1))
def propagate_bounds_INT_NE(self, op):
r = self.getintbound(op)
if r.is_constant():
if r.equal(0):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
if b1.intersect(b2):
self.propagate_bounds_backward(op.getarg(0))
if b2.intersect(b1):
self.propagate_bounds_backward(op.getarg(1))
def _propagate_int_is_true_or_zero(self, op, valnonzero, valzero):
if self.is_raw_ptr(op.getarg(0)):
return
r = self.getintbound(op)
if r.is_constant():
if r.getint() == valnonzero:
b1 = self.getintbound(op.getarg(0))
if b1.known_nonnegative():
b1.make_gt(IntBound(0, 0))
self.propagate_bounds_backward(op.getarg(0))
elif r.getint() == valzero:
b1 = self.getintbound(op.getarg(0))
# XXX remove this hack maybe?
# Clever hack, we can't use self.make_constant_int yet because
# the args aren't in the values dictionary yet so it runs into
# an assert, this is a clever way of expressing the same thing.
b1.make_ge(IntBound(0, 0))
b1.make_lt(IntBound(1, 1))
self.propagate_bounds_backward(op.getarg(0))
def propagate_bounds_INT_IS_TRUE(self, op):
self._propagate_int_is_true_or_zero(op, 1, 0)
def propagate_bounds_INT_IS_ZERO(self, op):
self._propagate_int_is_true_or_zero(op, 0, 1)
def propagate_bounds_INT_ADD(self, op):
if self.is_raw_ptr(op.getarg(0)) or self.is_raw_ptr(op.getarg(1)):
return
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
r = self.getintbound(op)
b = r.sub_bound(b2)
if b1.intersect(b):
self.propagate_bounds_backward(op.getarg(0))
b = r.sub_bound(b1)
if b2.intersect(b):
self.propagate_bounds_backward(op.getarg(1))
def propagate_bounds_INT_SUB(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
r = self.getintbound(op)
b = r.add_bound(b2)
if b1.intersect(b):
self.propagate_bounds_backward(op.getarg(0))
b = r.sub_bound(b1).mul(-1)
if b2.intersect(b):
self.propagate_bounds_backward(op.getarg(1))
def propagate_bounds_INT_MUL(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
r = self.getintbound(op)
b = r.py_div_bound(b2)
if b1.intersect(b):
self.propagate_bounds_backward(op.getarg(0))
b = r.py_div_bound(b1)
if b2.intersect(b):
self.propagate_bounds_backward(op.getarg(1))
def propagate_bounds_INT_LSHIFT(self, op):
b1 = self.getintbound(op.getarg(0))
b2 = self.getintbound(op.getarg(1))
r = self.getintbound(op)
b = r.rshift_bound(b2)
if b1.intersect(b):
self.propagate_bounds_backward(op.getarg(0))
propagate_bounds_INT_ADD_OVF = propagate_bounds_INT_ADD
propagate_bounds_INT_SUB_OVF = propagate_bounds_INT_SUB
propagate_bounds_INT_MUL_OVF = propagate_bounds_INT_MUL
dispatch_opt = make_dispatcher_method(OptIntBounds, 'optimize_',
default=OptIntBounds.emit)
dispatch_bounds_ops = make_dispatcher_method(OptIntBounds, 'propagate_bounds_')
dispatch_postprocess = make_dispatcher_method(OptIntBounds, 'postprocess_')
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