[PATCH] D42487: [X86][SSE] LowerBUILD_VECTORAsVariablePermute - add support for scaling index vectors

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: zvi, craig.topper, spatel, andreadb.

This allows us to use PSHUFB for v8i16 (and v4i32 after https://reviews.llvm.org/D42308) and VPERMD/PERMPS for v4i64/v4f64 variable shuffles.


Repository:
  rL LLVM

https://reviews.llvm.org/D42487

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/var-permute-128.ll
  test/CodeGen/X86/var-permute-256.ll

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