[PATCH] D14151: [X86][AVX] Fix lowering of X86ISD::VZEXT_MOVL for 128-bit -> 256-bit extension

[Simon Pilgrim via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: andreadb, spatel, chandlerc, qcolombet.
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The lowering patterns for X86ISD::VZEXT_MOVL for 128-bit to 256-bit vectors were just copying the lower xmm instead of actually masking off the first scalar using a xmm blend (we make use of the implicit zeroing of the upper ymm).

Fix for PR25320.

Repository:
  rL LLVM

http://reviews.llvm.org/D14151

Files:
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/vec_extract-avx.ll

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