[PATCH] D24635: AMDGPU: Push bitcasts through build_vector

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: tstellarAMD.
arsenm added a subscriber: llvm-commits.
Herald added subscribers: yaxunl, nhaehnle, wdng, kzhuravl, arsenm.

This reduces the number of copies and reg_sequences
when using fp constant vectors. This significantly
reduces the code size in local-stack-alloc-bug.ll

https://reviews.llvm.org/D24635

Files:
  lib/Target/AMDGPU/AMDGPUISelLowering.cpp
  test/CodeGen/AMDGPU/bitcast-vector-extract.ll

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