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Temporarily disabling memset forming optimization. Add an option.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48720 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-03-24 05:28:38 +00:00
parent e46611e6bc
commit 88ffdddcc4
1 changed files with 8 additions and 0 deletions
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8
lib/Transforms/Scalar/GVN.cpp
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@ -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<bool>
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<Instruction*> &toErase) {
if (!FormMemSet) return false;
if (SI->isVolatile()) return false;
// There are two cases that are interesting for this code to handle: memcpy