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RE: [PATCH] [Aarch64] Optimize subtract in shift counts

> Correct. It is truncated for integer shift, but not simd shift
> instructions. We generate a pattern in the split that only generates
> the integer shift instructions.

That's unfortunate, because it would be nice to do this in simplify_rtx,
since it's machine-independent, but that has to be conditioned on
SHIFT_COUNT_TRUNCATED, so you wouldn't get the benefit of it.
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