Commits on Jun 6, 2024

1. x86-64: Inline small array copy size for int and long arrays …

   (1)
   Inline small array copy size without using `rep movs`
   for int array and long array
     - If AVX-512 is supported and copy size <= 128 bytes,
       the inlined copy sequence is used.
     - If AVX is supported, the threshold for inlined sequence
       is 64 bytes instead.
     - The enhancement for 32 bit and 64 bit arrays will be reused
       in the downstream OpenJ9 project for reference arrays.
   
   (2)
   Refactor char array enhancement implementation to support
   both `rep movsw` and `rep movsd` if the copysize is greater
   than the supported enhancement threshold.
   
   (3)
   Add the following options to disable the enhancement
     - `disableArrayCopyIntArrayInlineSmallSizeWithoutREPMOVS`:
       disable the enhancement for int array
   
     - `disableArrayCopyLongArrayInlineSmallSizeWithoutREPMOVS`:
       disable the enhancement for long array
   
     - `disableArrayCopyReferenceArrayInlineSmallSizeWithoutREPMOVS`:
       disable the enhancement for reference array, which will be
       implemented in downstream project OpenJ9.
   
   Signed-off-by: Annabelle Huo <Annabelle.Huo@ibm.com>

   

   a7ehuo committed Jun 6, 2024
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