Fix file IO with chunk_size > 1

[Kuree]

• Using shifts instead of array for larger inputs
• Should support arbitrary chunk size
• Tested with chunk_size=2 with GarnetFlow

Is there any easy way to create a wide input circuit and test in fault?

[coveralls]

Pull Request Test Coverage Report for Build 1028

• 0 of 4 (0.0%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.04%) to 76.251%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
fault/system_verilog_target.py	0	4	0.0%
<!--	Total:	0	4	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
fault/system_verilog_target.py	2	56.91%
<!--	Total:	2		-->

Totals
Change from base Build 1010:	-0.04%
Covered Lines:	1387
Relevant Lines:	1819

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💛 - Coveralls

[leonardt]

Re: Is there any easy way to create a wide input circuit and test in fault?

You can just create a magma circuit with whatever width you'd like, e.g.

import magma as m

class WidePassthroughCircuit(m.Circuit):
    IO = ["I", m.In(m.Bits[128]), "O", m.Out(m.Bits[128])]
    @classmethod
    def definition(io):
        io.O <= io.I