[PATCH] D12990: AMDGPU: Handle i64->v2i32 loads/stores in PreprocessISelDAG

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: tstellarAMD.
arsenm added a subscriber: llvm-commits.
Herald added a subscriber: arsenm.

This fixes a select error when the i64 source was also
bitcasted to v2i32 in the original source.
    
Instead of awkwardly trying to select the modified source value and
the store, replace before isel begins.
    
Uses a worklist to avoid possible problems from mutating the DAG,
although it seems to work OK without it.


http://reviews.llvm.org/D12990

Files:
  lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
  test/CodeGen/AMDGPU/extract-vector-elt-i64.ll

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