[llvm-commits] [llvm] r125476 - /llvm/trunk/lib/CodeGen/PHIElimination.cpp

[Cameron Zwarich]

Author: zwarich
Date: Sun Feb 13 20:09:11 2011
New Revision: 125476

URL: http://llvm.org/viewvc/llvm-project?rev=125476&view=rev
Log:
Add a statistic to PHIElimination tracking the number of critical edges split.

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

Modified: llvm/trunk/lib/CodeGen/PHIElimination.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/PHIElimination.cpp?rev=125476&r1=125475&r2=125476&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/PHIElimination.cpp (original)
+++ llvm/trunk/lib/CodeGen/PHIElimination.cpp Sun Feb 13 20:09:11 2011
@@ -83,6 +83,7 @@
 }
 
 STATISTIC(NumAtomic, "Number of atomic phis lowered");
+STATISTIC(NumCriticalEdgesSplit, "Number of critical edges split");
 STATISTIC(NumReused, "Number of reused lowered phis");
 
 char PHIElimination::ID = 0;
@@ -413,8 +414,12 @@
           !LV.isLiveIn(Reg, MBB) && LV.isLiveOut(Reg, *PreMBB)) {
         if (!MLI ||
             !(MLI->getLoopFor(PreMBB) == MLI->getLoopFor(&MBB) &&
-              MLI->isLoopHeader(&MBB)))
-          Changed |= PreMBB->SplitCriticalEdge(&MBB, this) != 0;
+              MLI->isLoopHeader(&MBB))) {
+          if (PreMBB->SplitCriticalEdge(&MBB, this)) {
+            Changed = true;
+            ++NumCriticalEdgesSplit;
+          }
+        }
       }
     }
   }