[PATCH] D116072: [X86] GLC: Break false dependency for dest register for several instructions.

[Pei, Gen via Phabricator via llvm-commits]

gpei created this revision.
gpei added reviewers: craig.topper, LuoYuanke, pengfei, RKSimon.
Herald added a subscriber: hiraditya.
gpei requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

Force insert zero-idiom and break false dependency of dest register for several instructions.

The related instructions are:

  VPERMD/Q/PS/PD
  VRANGEPD/PS/SD/SS
  VGETMANTSS/SD/SH
  VGETMANDPS/PD - mem version only
  VPMULLQ
  VFMULCSH/PH
  VFCMULCSH/PH


https://reviews.llvm.org/D116072

Files:
  llvm/lib/Target/X86/X86.td
  llvm/lib/Target/X86/X86InstrInfo.cpp
  llvm/lib/Target/X86/X86Subtarget.h
  llvm/lib/Target/X86/X86TargetTransformInfo.h
  llvm/test/CodeGen/X86/cmul-false-deps.ll
  llvm/test/CodeGen/X86/getmant-false-deps.ll
  llvm/test/CodeGen/X86/perm.avx2-false-deps.ll
  llvm/test/CodeGen/X86/perm.avx512-false-deps.ll
  llvm/test/CodeGen/X86/pmullq-false-deps.ll
  llvm/test/CodeGen/X86/range-false-deps.ll

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