From 88ffdddcc42d80972644643da1096793dabae802 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Mon, 24 Mar 2008 05:28:38 +0000 Subject: [PATCH] Temporarily disabling memset forming optimization. Add an option. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48720 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Scalar/GVN.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/lib/Transforms/Scalar/GVN.cpp b/lib/Transforms/Scalar/GVN.cpp index a3a33237a36..a9445dd8530 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/GetElementPtrTypeIterator.h" #include "llvm/Target/TargetData.h" @@ -41,6 +42,12 @@ STATISTIC(NumGVNInstr, "Number of instructions deleted"); STATISTIC(NumGVNLoad, "Number of loads deleted"); STATISTIC(NumMemSetInfer, "Number of memsets inferred"); +namespace { + cl::opt + FormMemSet("form-memset-from-stores", + cl::desc("Transform straight-line stores to memsets"), + cl::init(false), cl::Hidden); +} //===----------------------------------------------------------------------===// // ValueTable Class @@ -1102,6 +1109,7 @@ static bool IsPointerAtOffset(Value *Ptr1, Value *Ptr2, uint64_t Offset, /// neighboring locations of memory. If it sees enough consequtive ones /// (currently 4) it attempts to merge them together into a memcpy/memset. bool GVN::processStore(StoreInst *SI, SmallVectorImpl &toErase) { + if (!FormMemSet) return false; if (SI->isVolatile()) return false; // There are two cases that are interesting for this code to handle: memcpy -- 2.34.1