[PATCH] Reassociate in favor of grouping previously paired operands

[Xuetian Weng]

Updated based on Daniel's comment.

This patch shift the rank range by (1 << 16) to have some reserved
space for pairing operands. Ranks are now adjusted after function
OptimizeExpresssion and resort again.


http://reviews.llvm.org/D10327

Files:
  lib/Transforms/Scalar/Reassociate.cpp
  test/Transforms/Reassociate/pair.ll

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