[llvm-commits] [llvm] r127192 - in /llvm/trunk: include/llvm/CodeGen/LiveIntervalAnalysis.h lib/CodeGen/LiveIntervalAnalysis.cpp

[Jakob Stoklund Olesen]

Author: stoklund
Date: Mon Mar  7 17:29:10 2011
New Revision: 127192

URL: http://llvm.org/viewvc/llvm-project?rev=127192&view=rev
Log:
Let shrinkToUses optionally return a list of now dead machine instructions.

Modified:
    llvm/trunk/include/llvm/CodeGen/LiveIntervalAnalysis.h
    llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp

Modified: llvm/trunk/include/llvm/CodeGen/LiveIntervalAnalysis.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/LiveIntervalAnalysis.h?rev=127192&r1=127191&r2=127192&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/LiveIntervalAnalysis.h (original)
+++ llvm/trunk/include/llvm/CodeGen/LiveIntervalAnalysis.h Mon Mar  7 17:29:10 2011
@@ -159,7 +159,9 @@
     /// range to just the remaining uses. This method does not compute reaching
     /// defs for new uses, and it doesn't remove dead defs.
     /// Dead PHIDef values are marked as unused.
-    void shrinkToUses(LiveInterval *li);
+    /// New dead machine instructions are added to the dead vector.
+    void shrinkToUses(LiveInterval *li,
+                      SmallVectorImpl<MachineInstr*> *dead = 0);
 
     // Interval removal
 

Modified: llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp?rev=127192&r1=127191&r2=127192&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp (original)
+++ llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp Mon Mar  7 17:29:10 2011
@@ -746,7 +746,8 @@
 /// shrinkToUses - After removing some uses of a register, shrink its live
 /// range to just the remaining uses. This method does not compute reaching
 /// defs for new uses, and it doesn't remove dead defs.
-void LiveIntervals::shrinkToUses(LiveInterval *li) {
+void LiveIntervals::shrinkToUses(LiveInterval *li,
+                                 SmallVectorImpl<MachineInstr*> *dead) {
   DEBUG(dbgs() << "Shrink: " << *li << '\n');
   assert(TargetRegisterInfo::isVirtualRegister(li->reg)
          && "Can't only shrink physical registers");
@@ -852,6 +853,10 @@
       MachineInstr *MI = getInstructionFromIndex(VNI->def);
       assert(MI && "No instruction defining live value");
       MI->addRegisterDead(li->reg, tri_);
+      if (dead && MI->allDefsAreDead()) {
+        DEBUG(dbgs() << "All defs dead: " << *MI);
+        dead->push_back(MI);
+      }
     }
   }