Commits on Sep 12, 2024

1. [FMV] Unify ls64, ls64_v and ls64_accdata. …

   As originally discussed in ARM-software#315 and then in ARM-software#329 we want to unify
   features that the toolchains cannot support independently. In the
   case of ls64 I have attempted to split the lumped feature in the
   compiler (see llvm/llvm-project#101712),
   but unfortunately this would break backwards compatibility:
   
   Mapping 'ls64' to FeatureLS64_ACCDATA would enable all three of
   {FeatureLS64, FeatureLS64_V, FeatureLS64_ACCDATA} but then using
   'nols64' either on the command line or the assembler directive
   would only disable FeatureLS64_ACCDATA without disabling the
   other two. For that we would have to map 'ls64' to FeatureLS64,
   but then it would not enable the other two.
   
   As far as I am aware there are no hardware implementations out
   there which implement ls64 without ls64_v or ls64_accdata, so
   unifying these features in the specification should not be a
   regression for feature detection. If any of this changes in
   the feature we can revisit the specification.

   

   labrinea committed Sep 12, 2024
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