Commits on Feb 7, 2024

1. Define soft-float PCS for AArch64 …

   With the release of the Cortex-R82, we now have an AArch64 CPU which can
   be built without any floating-point instructions or registers, so I
   think we should re-consider our decision to not have a soft-float
   variant of the AArch64 PCS.
   
   I've worded this as a variant over the base PCS, to keep it simple.
   
   No compiler implements this yet, but clang does already allow passing
   floating-point types without an FPU, and seems to implement the first
   bullet point correctly. I'm working on LLVM patches which will
   implement bullet points 2 and 3.
   
   GCC doesn't currently allow any use of floating-point types without an
   FPU for AArch64, so we don't need to worry about compatibility with
   existing code there.
   
   For the fourth bullet point, I don't think we need to define the PCS for
   vector types, because these are only defined by the ACLE when the
   relevant hardware exists.

   

   ostannard committed Feb 7, 2024
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