Matthias Braun 28eae8f4e0 LiveRegUnits: Add accumulateBackward() function ...

Re-Commit r292543 with a fix for the situation when the chain end is
MBB.end().

This function can be used to accumulate the set of all read and modified
register in a sequence of instructions.

Use this code in AArch64A57FPLoadBalancing::scavengeRegister() to prove
the concept.

- The AArch64A57LoadBalancing code is using a backwards analysis now
  which is irrespective of kill flags. This is the main motivation for
  this change.

Differential Revision: http://reviews.llvm.org/D22082

llvm-svn: 292705

2017-01-21 02:21:04 +00:00

4.1 KiB

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