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from rpython.rtyper.lltypesystem.lloperation import llop
from rpython.translator.backendopt import removenoops
def has_side_effects(op):
if op.opname == 'debug_assert':
return False
try:
return getattr(llop, op.opname).sideeffects
except AttributeError:
return True
def storesink_graph(graph):
def clear_cache_for(cache, concretetype, fieldname):
for k in cache.keys():
if k[0].concretetype == concretetype and k[1] == fieldname:
del cache[k]
added_some_same_as = False
for block in graph.iterblocks():
newops = []
cache = {}
for op in block.operations:
if op.opname == 'getfield':
tup = (op.args[0], op.args[1].value)
res = cache.get(tup, None)
if res is not None:
op.opname = 'same_as'
op.args = [res]
added_some_same_as = True
else:
cache[tup] = op.result
elif op.opname in ['setarrayitem', 'setinteriorfield']:
pass
elif op.opname == 'setfield':
clear_cache_for(cache, op.args[0].concretetype,
op.args[1].value)
elif has_side_effects(op):
cache = {}
newops.append(op)
if block.operations:
block.operations = newops
if added_some_same_as:
removenoops.remove_same_as(graph)
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