[PATCH] D26938: [X86][SSE] Improve UINT_TO_FP v2i32 -> v2f64

[Simon Pilgrim via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, zvi, mkuper, spatel, andreadb.
RKSimon added a subscriber: llvm-commits.
RKSimon set the repository for this revision to rL LLVM.

Vectorize UINT_TO_FP v2i32 -> v2f64 instead of scalarization (albeit still on the SIMD unit).

The codegen matches that generated by legalization (and is in fact used by AVX for UINT_TO_FP v4i32 -> v4f64), but has to be done in the x86 backend to account for legalization via 4i32.


Repository:
  rL LLVM

https://reviews.llvm.org/D26938

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vec_int_to_fp.ll

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