[PATCH] D26590: [X86][SSE] Improve lowering of vXi64 multiply with known zero 32-bit halves

[Simon Pilgrim via llvm-commits]

RKSimon updated this revision to Diff 78158.
RKSimon added a comment.

Updated based on Craig's feedback


Repository:
  rL LLVM

https://reviews.llvm.org/D26590

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

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