[PATCH] D26111: AArch64: Schedule DeadRegisterDefinitionsPass before regalloc.

[Matthias Braun via llvm-commits]

MatzeB created this revision.
MatzeB added reviewers: t.p.northover, mcrosier, rengolin, jmolloy, qcolombet.
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Herald added a subscriber: aemerson.

Doing this before register allocation reduces register pressure as we do
not even have to allocate a register for those dead definitions.

(Requires https://reviews.llvm.org/D26106 to avoid some accidental regressions).

I am running tests on the effects now and add a comment here.


https://reviews.llvm.org/D26111

Files:
  lib/Target/AArch64/AArch64DeadRegisterDefinitionsPass.cpp
  lib/Target/AArch64/AArch64TargetMachine.cpp

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