Commits on Jan 10, 2024

1. [Vector ABI] Type size and alignment for vector types. …

   The issue of Vector alignment is discussed in #347. It is mentioned that
   aligning to 128 bytes might deliver better performance on some RISC-V cores,
   but this behavior could lead to considerable stack wastage on zve32 and zve64
   cores. For instance, in order to ensure a vector value in the stack conforms
   to the ABI specification, we could potentially waste up to 96 bits per vector
   object in stack for zve32, and the performance difference isn't always evident
   across all core implementations.
   
   Therefore, this proposal sets the alignment of vector types to element
   alignment, to avoid wasting a significant amount of stack space in zve32 and
   zve64 configurations. Also, since the ABI only specify the minimum alignment
   and doesn't limit the compiler from adopting higher alignment for specific CPUs.
   
   Fix #347.

   

   kito-cheng committed Jan 10, 2024
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