diff options
| -rw-r--r-- | lib/Transforms/Scalar/GVN.cpp | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/GVN.cpp b/lib/Transforms/Scalar/GVN.cpp index cbc24ed..88377d5 100644 --- a/lib/Transforms/Scalar/GVN.cpp +++ b/lib/Transforms/Scalar/GVN.cpp @@ -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(NumGVNInstr, "Number of instructions deleted"); 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 @@ bool GVN::iterateOnFunction(Function &F) { 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; } |