[PATCH] [X86] Break false dependencies before partial register updates when the source operand is in memory

[Michael Kuperstein]

Hi atrick, nadav,

The list of opcodes false-dependency-breaking looks at consists only of register-source variants, but not memory-source.
It doesn't look like there's a good reason for that, since memory-source variants suffer from the same problem - e.g. the loop in the attached testcase gets a roughly 3x performance improvement on sandybridge.

http://reviews.llvm.org/D6620

Files:
  lib/Target/X86/X86InstrInfo.cpp
  test/CodeGen/X86/sse-domains.ll

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