[llvm-commits] [llvm] r127773 - /llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp

[Jakob Stoklund Olesen]

Author: stoklund
Date: Wed Mar 16 17:56:13 2011
New Revision: 127773

URL: http://llvm.org/viewvc/llvm-project?rev=127773&view=rev
Log:
Erase virtual registers that are unused after DCE.

Modified:
    llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp

Modified: llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp?rev=127773&r1=127772&r2=127773&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp (original)
+++ llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp Wed Mar 16 17:56:13 2011
@@ -174,13 +174,21 @@
         if (!TargetRegisterInfo::isVirtualRegister(Reg))
           continue;
         LiveInterval &LI = LIS.getInterval(Reg);
-        // Remove defined value.
-        if (MOI->isDef())
-          if (VNInfo *VNI = LI.getVNInfoAt(Idx))
-            LI.removeValNo(VNI);
+
         // Shrink read registers.
         if (MI->readsVirtualRegister(Reg))
           ToShrink.insert(&LI);
+
+        // Remove defined value.
+        if (MOI->isDef()) {
+          if (VNInfo *VNI = LI.getVNInfoAt(Idx)) {
+            LI.removeValNo(VNI);
+            if (LI.empty()) {
+              ToShrink.remove(&LI);
+              eraseVirtReg(Reg, LIS);
+            }
+          }
+        }
       }
 
       if (delegate_)