[PATCH] D15157: CodeGen peephole: fold redundant phys reg copies

[JF Bastien via llvm-commits]

jfb updated this revision to Diff 41672.
jfb added a comment.

Restrict to non-allocatable physical registers.

I tried using MachineRegisterInfo::isConstantPhysReg instead but that's too
conservative and doesn't include the main motivator for this patch: EFLAGS.

This implements the change qcolombet suggested and passes all x86 tests,
including the new test I added incdec-and-branch.ll.


http://reviews.llvm.org/D15157

Files:
  lib/CodeGen/PeepholeOptimizer.cpp
  test/CodeGen/X86/incdec-and-branch.ll

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