[llvm-commits] [llvm] r52506 - /llvm/trunk/lib/Transforms/Scalar/GVN.cpp

[Owen Anderson]

Author: resistor
Date: Thu Jun 19 14:57:25 2008
New Revision: 52506

URL: http://llvm.org/viewvc/llvm-project?rev=52506&view=rev
Log:
Add a hidden -disable-pre flag for testing purposes.  This should be removed
once benchmarking is completed.

Modified:
    llvm/trunk/lib/Transforms/Scalar/GVN.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/GVN.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/GVN.cpp?rev=52506&r1=52505&r2=52506&view=diff

==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/GVN.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/GVN.cpp Thu Jun 19 14:57:25 2008
@@ -32,6 +32,7 @@
 #include "llvm/Analysis/AliasAnalysis.h"
 #include "llvm/Analysis/MemoryDependenceAnalysis.h"
 #include "llvm/Support/CFG.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Transforms/Utils/BasicBlockUtils.h"
@@ -41,6 +42,9 @@
 STATISTIC(NumGVNLoad, "Number of loads deleted");
 STATISTIC(NumGVNPRE, "Number of instructions PRE'd");
 
+static cl::opt<bool> DisablePRE("disable-pre",
+                                cl::init(false), cl::Hidden);
+
 //===----------------------------------------------------------------------===//
 //                         ValueTable Class
 //===----------------------------------------------------------------------===//
@@ -1285,7 +1289,9 @@
   for (df_iterator<DomTreeNode*> DI = df_begin(DT.getRootNode()),
        DE = df_end(DT.getRootNode()); DI != DE; ++DI)
     changed |= processBlock(*DI);
-    
-  changed |= performPRE(F);
+  
+  if (!DisablePRE)
+    changed |= performPRE(F);
+  
   return changed;
 }