[PATCH] D14968: RegisterPressure: Make liveness tracking subregister aware

Matthias Braun via llvm-commits llvm-commits at lists.llvm.org
Tue Nov 24 14:09:03 PST 2015


MatzeB created this revision.
MatzeB added a reviewer: atrick.
MatzeB added a subscriber: llvm-commits.
MatzeB set the repository for this revision to rL LLVM.

Some comments:

- I did not see any compiletime impact of this change if subregister/lanemask tracking is disabled
- Compiletime when subregister/lanemask tracking is affected, this is because the only way to see which lanes are actually dead or use an undefined value is to perform a liveness query. Unfortunately we have to perform this query for each register operand.


Repository:
  rL LLVM

http://reviews.llvm.org/D14968

Files:
  include/llvm/CodeGen/MachineScheduler.h
  include/llvm/CodeGen/RegisterPressure.h
  lib/CodeGen/MachineScheduler.cpp
  lib/CodeGen/RegisterPressure.cpp

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