#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"
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
//===----------------------------------------------------------------------===//
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;
}