[PATCH] D16994: [X86][AVX2] Fix SIGN_EXTEND vector handling on AVX2 targets.

[Simon Pilgrim via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: ab, qcolombet, mkuper.
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On AVX2 target we are poorly legalizing SIGN_EXTEND ops for which the input's legalized type doesn't have the same number of elements as the destination, resulting in an ANY_EXTEND followed by a SIGN_EXTEND_INREG.

This patch uses the existing SIGN_EXTEND -> SIGN_EXTEND_VECTOR_INREG combine to extend the input to the size of the result and using SIGN_EXTEND_VECTOR_INREG instead. 

Repository:
  rL LLVM

http://reviews.llvm.org/D16994

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

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