Pete Cooper c61f7144eb [AArch64] Use MachineRegisterInfo instead of LiveIntervals to calculate liveness. NFC. ...

The CondOpt pass currently uses LiveIntervals to set the dead flag on a def.  This patch uses MachineRegisterInfo::use_empty instead as that is equivalent to the def being dead.

This removes an instance of LiveIntervals in the pass manager pipeline and saves 3.8% of compile time on llc conpiled for AArch64.

Reviewed by Chad Rosier and Zhaoshi.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235532 91177308-0d34-0410-b5e6-96231b3b80d8

2015-04-22 18:05:13 +00:00

14 KiB

Raw Blame History

View Raw