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from node import collect_vars
class IRNode:
def __init__(self):
pass
class Assign(IRNode):
def __init__(self, name, expr):
super(IRNode, self).__init__()
self.name = name
self.expr = expr
class Assert(IRNode):
def __init__(self, expr):
super(IRNode, self).__init__()
self.expr = expr
def optimize_ir(out_var, instrs):
used_vars = set([out_var])
for instr in instrs:
if isinstance(instr, Assert):
used_vars |= collect_vars(instr.expr)
elif isinstance(instr, Assign):
used_vars |= collect_vars(instr.expr)
opt_instrs = []
for instr in instrs:
if not(isinstance(instr, Assign)) or instr.name in used_vars:
opt_instrs.append(instr)
return opt_instrs
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