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 237e465e906cec9b5c196b43754b30b3b73910cb..5da683eb999ac779db35e692f342e9fc452738a5 100644 (file)
--- 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());