[PATCH] D49924: [DAGCombiner] transform sub-of-shifted-signbit to add

[Sanjay Patel via Phabricator via llvm-commits]

spatel updated this revision to Diff 157784.
spatel marked an inline comment as done.
spatel added a comment.

Patch updated:
Add a code comment to describe the transform and motivation.


https://reviews.llvm.org/D49924

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AArch64/signbit-shift.ll
  test/CodeGen/PowerPC/signbit-shift.ll
  test/CodeGen/X86/signbit-shift.ll

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