[PATCH] CSE on GEP indices

[Jingyue Wu]

all comments addressed. PTAL

ConstantOffsetExtractor::find now traces into two more operators: sext and zext. For safety, we only traces into sext/zext when its operand is guaranteed not to overflow. e.g., we can safely transform "sext (add nsw a, 5)" into "add nsw (sext a), 5". 

Added a new unit test in split-gep.ll to test the above transformation. 

Passed "make -C test".

http://reviews.llvm.org/D3462

Files:
  include/llvm/InitializePasses.h
  include/llvm/LinkAllPasses.h
  include/llvm/Transforms/Scalar.h
  lib/Target/NVPTX/NVPTXTargetMachine.cpp
  lib/Transforms/Scalar/Scalar.cpp
  lib/Transforms/Scalar/SeparateConstOffsetFromGEP.cpp
  test/Transforms/SeparateConstOffsetFromGEP/NVPTX/lit.local.cfg
  test/Transforms/SeparateConstOffsetFromGEP/NVPTX/split-gep-and-gvn.ll
  test/Transforms/SeparateConstOffsetFromGEP/NVPTX/split-gep.ll
-------------- next part --------------
A non-text attachment was scrubbed...
Name: D3462.8831.patch
Type: text/x-patch
Size: 35271 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20140425/d1c95606/attachment.bin>