[PATCH] D42646: [X86] Avoid using high register trick for test instruction

[Amaury SECHET via Phabricator via llvm-commits]

deadalnix updated this revision to Diff 132147.
deadalnix added a comment.

Reduce the diff to simply avoid doing the high register trick.
It turns out that there is a bug in the other optimization made in the orginal diff, so it seems like a better idea to split that out in several smaller steps to ensure progress.


Repository:
  rL LLVM

https://reviews.llvm.org/D42646

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  lib/Target/X86/X86InstrArithmetic.td
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86MacroFusion.cpp
  test/CodeGen/X86/testb-je-fusion.ll
  test/CodeGen/X86/vastart-defs-eflags.ll

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