From: Matthias Braun <matze@braunis.de>
Date: Tue, 29 Sep 2015 00:20:32 +0000 (+0000)
Subject: RegisterPressure: LiveRegSet tracks register units not physregs
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=64ffcd4e983e4159bcb39104e77f2eb2a15473b7;p=oota-llvm.git

RegisterPressure: LiveRegSet tracks register units not physregs

There are always more physical registers and register units so the
previous behaviour was correct but we can do with less memory.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248767 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/RegisterPressure.cpp b/lib/CodeGen/RegisterPressure.cpp
index 237e465e906..5da683eb999 100644
--- a/lib/CodeGen/RegisterPressure.cpp
+++ b/lib/CodeGen/RegisterPressure.cpp
@@ -210,7 +210,7 @@ void RegPressureTracker::init(const MachineFunction *mf,
 
   P.MaxSetPressure = CurrSetPressure;
 
-  LiveRegs.PhysRegs.setUniverse(TRI->getNumRegs());
+  LiveRegs.PhysRegs.setUniverse(TRI->getNumRegUnits());
   LiveRegs.VirtRegs.setUniverse(MRI->getNumVirtRegs());
   if (TrackUntiedDefs)
     UntiedDefs.setUniverse(MRI->getNumVirtRegs());