[PATCH] D27657: [X86][SSE] Lower suitably sign-extended mul vXi64 using PMULDQ

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: igorb, mkuper, craig.topper, spatel, andreadb.
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PMULDQ returns the 64-bit result of the signed multiplication of the lower 32-bits of vXi64 vector inputs, we can lower with this if the sign bits stretch that far.


Repository:
  rL LLVM

https://reviews.llvm.org/D27657

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/masked_gather_scatter.ll
  test/CodeGen/X86/pmul.ll
  test/CodeGen/X86/vector-trunc-math.ll

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