[PATCH] D12032: Vector element extraction without stack operations on Power 8

[Nemanja Ivanovic via llvm-commits]

nemanjai created this revision.
nemanjai added reviewers: wschmidt, hfinkel, kbarton, seurer.
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This patch builds onto the patch that provided scalar to vector conversions without stack operations (D11471).
Included in this patch:
- Vector element extraction for all vector types with constant element number (both LE and BE)
- Vector element extraction for v16i8 and v8i16 with variable element number (both LE and BE)
- Removal of some unnecessary COPY_TO_REGCLASS operations that ended up unnecessarily moving things around between registers

Not included in this patch (will be in upcoming patch):
- Vector element extraction for v4i32, v4f32, v2i64 and v2f64 with variable element number
- Vector element insertion for variable/constant element number

Testing is provided for all extractions. The extractions that are not implemented yet are just placeholders.

Repository:
  rL LLVM

http://reviews.llvm.org/D12032

Files:
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCInstrVSX.td
  lib/Target/PowerPC/PPCVSXCopy.cpp
  test/CodeGen/PowerPC/p8-scalar_vector_conversions.ll

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