aarch64: Implement uextend/sextend for i128 values #3005
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cfallin
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Jun 21, 2021
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| let needs_extend = from_bits < to_bits && to_bits <= 64; | ||
| // For i128, we want to extend the lower half, except if it is already 64 bits. | ||
| let needs_lower_extend = to_bits > 64 && from_bits < 64; |
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Can we clarify the logic a bit by adding a let pass_through_lower = to_bits > 64 && !needs_lower_extend here, then moving the move-emission below (will comment separately)?
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With the above pass_through_lower, could we do an else if pass_through_lower { ctx.emit(/* move */) } here? I like that arrangement a bit better as it gives a clear separation between "produce lower register" and "produce upper register" parts of the code.
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Hey, a few more ops for i128 support