= Solution
More <processor registers> can reduce <register spills> and the associated loads and stores. A richer instruction set may also replace several old <machine instructions> by one new operation. Both effects can \b[decrease the number of instructions] in a compiled program, although a particular program might obtain no benefit.
Wider <instruction encodings> increase the <bytes> per instruction. Consequently \b[the total machine-code size can increase or decrease]: approximately, it is instruction count times average encoded instruction width, with alignment and padding also relevant. There is no universal net direction without the program and revised encoding. The length of <assembly language> source text is a separate matter and is not determined by instruction <bit> widths.
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