[PATCH] D17219: [x86-64] allow mfence even with -mno-sse (PR23203)

[Sanjay Patel via llvm-commits]

spatel created this revision.
spatel added reviewers: jfb, craig.topper, majnemer.
spatel added a subscriber: llvm-commits.
Herald added a subscriber: mcrosier.

As shown in:
https://llvm.org/bugs/show_bug.cgi?id=23203
...we currently die because lowering believes that mfence is allowed without SSE2 on x86-64, but the instruction def doesn't know that.
I don't know if this is right, but if not, at least it's consistently wrong. :)

http://reviews.llvm.org/D17219

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrInfo.td
  lib/Target/X86/X86InstrSSE.td
  lib/Target/X86/X86Subtarget.h
  test/CodeGen/X86/mfence.ll

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