def from_range_state(cls, context, builder, state):
            """
            Create a RangeIter initialized from the given RangeState *state*.
            """
            self = cls(context, builder)
            start = state.start
            stop = state.stop
            step = state.step

            startptr = cgutils.alloca_once(builder, start.type)
            builder.store(start, startptr)

            countptr = cgutils.alloca_once(builder, start.type)

            self.iter = startptr
            self.stop = stop
            self.step = step
            self.count = countptr

            diff = builder.sub(stop, start)
            zero = context.get_constant(int_type, 0)
            one = context.get_constant(int_type, 1)
            pos_diff = builder.icmp_signed('>', diff, zero)
            pos_step = builder.icmp_signed('>', step, zero)
            sign_differs = builder.xor(pos_diff, pos_step)
            zero_step = builder.icmp_unsigned('==', step, zero)

            with cgutils.if_unlikely(builder, zero_step):
                # step shouldn't be zero
                context.call_conv.return_user_exc(builder, ValueError,
                                                  ("range() arg 3 must not be zero",))

            with builder.if_else(sign_differs) as (then, orelse):
                with then:
                    builder.store(zero, self.count)

                with orelse:
                    rem = builder.srem(diff, step)
                    rem = builder.select(pos_diff, rem, builder.neg(rem))
                    uneven = builder.icmp_signed('>', rem, zero)
                    newcount = builder.add(builder.sdiv(diff, step),
                                           builder.select(uneven, one, zero))
                    builder.store(newcount, self.count)

            return self

            Create a RangeIter initialized from the given RangeState *state*.
            
numba/cpython/rangeobj.py