[PATCH] D52374: [MachineCopyPropagation] Reimplement CopyTracker in terms of register units

[Justin Bogner via Phabricator via llvm-commits]

bogner created this revision.
bogner added a reviewer: MatzeB.
Herald added subscribers: llvm-commits, kristof.beyls, mcrosier.
Herald added a reviewer: javed.absar.
bogner added a dependency: D52370: [MachineCopyPropagation] Rework how we manage RegMask clobbers.

Change the copy tracker to keep a single map of register units instead
of 3 maps of registers. This gives a very significant compile time
performance improvement to the pass. I measured a 30-40% decrease in
time spent in MCP on x86 and AArch64 and much more significant
improvements on an out of tree target with more registers.


Repository:
  rL LLVM

https://reviews.llvm.org/D52374

Files:
  lib/CodeGen/MachineCopyPropagation.cpp

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