[PATCH] D35859: [PowerPC] Add codegen for VSX word extract convert to FP

[Lei Huang via Phabricator via llvm-commits]

lei created this revision.

Add codegen for VSX word extract conversion from signed/unsigned to single/double precision.

//For UINT_TO_FP://
Extract word unsigned and convert to float was implemented in https://reviews.llvm.org/D20239.
Here we will add the missing extract integer and conversion to double. This utilizes the new https://reviews.llvm.org/P9 instruction xxextractuw to extracting an integer element when the result will be converted to double thereby saving 2 direct moves (VSR <-> GPR).

//For SINT_TO_FP://
We will implement the following sequence which will also reduce the number of instructions by saving 2 direct moves.

  v4i32->f32:
          xxspltw
          xvcvsxwsp
          xscvspdpn 
  
  v4i32->f64:
          xxspltw
          xvcvsxwdp


https://reviews.llvm.org/D35859

Files:
  lib/Target/PowerPC/PPCInstrVSX.td
  test/CodeGen/PowerPC/p9-xxinsertw-xxextractuw.ll
  test/CodeGen/PowerPC/remove-redundant-moves.ll

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