[PATCH] D28966: [PGO] Memory intrinsic calls optimization based on profiled size

[Rong Xu via Phabricator via llvm-commits]

xur created this revision.

This patch optimizes two memory intrinsic operations: memset and memcpy based on the profiled size of the operation. The high level transformation is like:
mem_op(..., size)

>
-

switch (size) {

  case s1:
     mem_op(..., s1);
     goto merge_bb;
  case s2:
     mem_op(..., s2);
     goto merge_bb;
  ...
  default:
     mem_op(..., size);
     goto merge_bb;
  }

merge_bb:

There are a few internal options that controls when the optimization takes place.

This patch in an incremental patch based on
https://reviews.llvm.org/D28965


https://reviews.llvm.org/D28966

Files:
  lib/Transforms/Instrumentation/PGOInstrumentation.cpp

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