Correct. -----Original Message----- From: Richard Kenner [mailto:[email protected]] Sent: Tuesday, August 8, 2017 1:20 PM To: Michael Collison <[email protected]> Cc: [email protected]; nd <[email protected]>; [email protected] Subject: 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.
