[llvm-commits] [llvm] r122473 - /llvm/trunk/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp

[Andrew Trick]

Author: atrick
Date: Wed Dec 22 21:43:21 2010
New Revision: 122473

URL: http://llvm.org/viewvc/llvm-project?rev=122473&view=rev
Log:
In CheckForLiveRegDef use TRI->getOverlaps.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp?rev=122473&r1=122472&r2=122473&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp Wed Dec 22 21:43:21 2010
@@ -659,15 +659,18 @@
                                SmallSet<unsigned, 4> &RegAdded,
                                SmallVector<unsigned, 4> &LRegs,
                                const TargetRegisterInfo *TRI) {
-  if (LiveRegDefs[Reg] && LiveRegDefs[Reg] != SU) {
+  for (const unsigned *AliasI = TRI->getOverlaps(Reg); *AliasI; ++AliasI) {
+
+    // Check if Ref is live.
+    if (!LiveRegDefs[Reg]) continue;
+
+    // Allow multiple uses of the same def.
+    if (LiveRegDefs[Reg] == SU) continue;
+
+    // Add Reg to the set of interfering live regs.
     if (RegAdded.insert(Reg))
       LRegs.push_back(Reg);
   }
-  for (const unsigned *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias)
-    if (LiveRegDefs[*Alias] && LiveRegDefs[*Alias] != SU) {
-      if (RegAdded.insert(*Alias))
-        LRegs.push_back(*Alias);
-    }
 }
 
 /// DelayForLiveRegsBottomUp - Returns true if it is necessary to delay