commit cc5c4296fda7270e8394626d7254596f5f9c8d82
author Jakob Stoklund Olesen <stoklund@2pi.dk> Wed Mar 16 22:56:13 2011 +0000
committer Jakob Stoklund Olesen <stoklund@2pi.dk> Wed Mar 16 22:56:13 2011 +0000
tree 8730d7e136f733d8cbe5a87f688ea075dd7d1c59
parent 2926733240d0766fbd45df6eb609ad2328f0307d

Erase virtual registers that are unused after DCE.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127773 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/LiveRangeEdit.cpp

diff --git a/lib/CodeGen/LiveRangeEdit.cpp b/lib/CodeGen/LiveRangeEdit.cpp
index 0769f95..e994d8c 100644
--- a/lib/CodeGen/LiveRangeEdit.cpp
+++ b/lib/CodeGen/LiveRangeEdit.cpp
@@ -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_)