[PATCH] D25347: [VirtRegRewriter] Eliminate COPYs before re-writing by renaming.

[Geoff Berry via llvm-commits]

gberry created this revision.
gberry added reviewers: MatzeB, qcolombet.
gberry added subscribers: jonpa, mcrosier, junbuml, llvm-commits.

This adds a simple copy propagation pass to VirtRegRewriter that uses
LiveIntervals to find COPYs whose destination can be renamed allowing
the COPY to be eliminated when doing so would be beneficial.


https://reviews.llvm.org/D25347

Files:
  lib/CodeGen/VirtRegMap.cpp
  test/CodeGen/AArch64/machine_cse_impdef_killflags.ll
  test/CodeGen/X86/ipra-local-linkage.ll
  test/CodeGen/X86/mul-i1024.ll
  test/CodeGen/X86/mul-i512.ll

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