Commits on Apr 4, 2023

1. Extend basic block without aggressive memory copy …

   Due to the significant overhead associated with using aggressive memory
   copy, we opted to use a pointer to the begin of IR array of the basic block
   we intend to merge, rather than copying whole IR array to the basic block
   we wish to extend.
   
   The performance results obtained from running CoreMark using different
   implementation strategies for EBB are presented below. As we can see,
   aggressive memory copy substantially degrades performance.
   
   |Test| aggressive memcpy|Compiler | Iterations / Sec |Speedup|
   |----+------------------+---------+------------------+-------|
   | BB |                  |clang-15 |  971.951         |       |
   |----+------------------+---------+------------------+-------|
   | BB |                  | gcc-12  |  963.336         |       |
   |----+------------------+---------+------------------+-------|
   | EBB|       O          |clang-15 |  1013.070        | +4.2% |
   |----+------------------+---------+------------------+-------|
   | EBB|       O          | gcc-12  |  1020.391        | +6%   |
   |----+------------------+---------+------------------+-------|
   | EBB|       X          |clang-15 |  1160.894        | +19.4%|
   |----+------------------+---------+------------------+-------|
   | EBB|       X          | gcc-12  | 1167.938         | +21.2%|

   

   qwe661234 committed Apr 4, 2023
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