[PATCH] D12118: [DAGCombiner] Added SMAX/SMIN/UMAX/UMIN constant folding

[Simon Pilgrim via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: jmolloy, spatel, andreadb.
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Added support for constant folding of SMAX/SMIN/UMAX/UMIN nodes

We still need to add constant folding of vector comparisons to fold the tests for targets that don't support the respective min/max nodes

I needed to update 2011-12-06-AVXVectorExtractCombine to load a vector instead of using a constant vector to prevent it folding

Repository:
  rL LLVM

http://reviews.llvm.org/D12118

Files:
  include/llvm/CodeGen/SelectionDAG.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  test/CodeGen/X86/2011-12-06-AVXVectorExtractCombine.ll
  test/CodeGen/X86/vec_minmax_sint.ll
  test/CodeGen/X86/vec_minmax_uint.ll

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