def _optimize_CALL_INT_PY_DIV(self, op):
arg1 = op.getarg(1)
b1 = self.getintbound(arg1)
arg2 = op.getarg(2)
b2 = self.getintbound(arg2)
if b1.equal(0):
self.make_constant_int(op, 0)
self.last_emitted_operation = REMOVED
return True
if not b2.is_constant():
return False
val = b2.getint()
if val <= 0:
return False
if val == 1:
self.make_equal_to(op, arg1)
self.last_emitted_operation = REMOVED
return True
elif val & (val - 1) == 0: # val == 2**shift
from rpython.jit.metainterp.history import DONT_CHANGE
op = self.replace_op_with(op, rop.INT_RSHIFT,
args=[arg1, ConstInt(highest_bit(val))],
descr=DONT_CHANGE) # <- xxx rename? means "kill"
self.optimizer.send_extra_operation(op)
return True
else:
from rpython.jit.metainterp.optimizeopt import intdiv
known_nonneg = b1.known_nonnegative()
operations = intdiv.division_operations(arg1, val, known_nonneg)
newop = None
for newop in operations:
self.optimizer.send_extra_operation(newop)
self.make_equal_to(op, newop)
return True
def test_division_operations(n, m, known_nonneg):
if n < 0:
known_nonneg = False
n_box = InputArgInt()
ops = division_operations(n_box, m, known_nonneg)
constants = {n_box: ConstInt(n)}
for op in ops:
argboxes = op.getarglist()
constantboxes = [constants.get(box, box) for box in argboxes]
res = execute(None, None, op.getopnum(), None, *constantboxes)
constants[op] = ConstInt(res)
assert constants[op].getint() == n // m
def _optimize_CALL_INT_PY_DIV(self, op):
arg1 = op.getarg(1)
b1 = self.getintbound(arg1)
arg2 = op.getarg(2)
b2 = self.getintbound(arg2)
if b1.is_constant() and b1.getint() == 0:
self.make_constant_int(op, 0)
self.last_emitted_operation = REMOVED
return True
# This is Python's integer division: 'x // (2**shift)' can always
# be replaced with 'x >> shift', even for negative values of x
if not b2.is_constant():
return False
val = b2.getint()
if val <= 0:
return False
if val == 1:
self.make_equal_to(op, arg1)
self.last_emitted_operation = REMOVED
return True
elif val & (val - 1) == 0: # val == 2**shift
from rpython.jit.metainterp.history import DONT_CHANGE
op = self.replace_op_with(
op, rop.INT_RSHIFT, args=[arg1, ConstInt(highest_bit(val))], descr=DONT_CHANGE
) # <- xxx rename? means "kill"
self.optimizer.send_extra_operation(op)
return True
else:
from rpython.jit.metainterp.optimizeopt import intdiv
known_nonneg = b1.known_ge(IntBound(0, 0))
operations = intdiv.division_operations(arg1, val, known_nonneg)
newop = None
for newop in operations:
self.optimizer.send_extra_operation(newop)
self.make_equal_to(op, newop)
return True
