[PATCH] D41908: [X86][MMX] Add support for MMX zero vector creation

[Simon Pilgrim via Phabricator via llvm-commits]

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

As mentioned on PR35869, (and came up recently on https://reviews.llvm.org/D41517) we don't create a MMX zero register via the PXOR but instead perform a spill to stack from a xmm zero register.

This patch adds support for direct MMX zero vector creation and should make it easier to add better constant vector creation in the future as well.


Repository:
  rL LLVM

https://reviews.llvm.org/D41908

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrMMX.td
  test/CodeGen/X86/vector-shuffle-mmx.ll

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