def _print_Mul(self, expr):
if len(expr.args) == 2: # log2 and log10
a, b = expr.args
if is_inv(a) and is_log(a.base) and is_log(b):
log_base = a.base.args[0]
if log_base in [2, 10]:
return "log%d(%s)" % (log_base, self._print(b.args[0]))
return CCodePrinter._print_Mul(self, expr)
