indvars --disable-iv-rewrite: sever ties with IVUsers.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133988 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp
index 126dbfd..5876380 100644
--- a/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -52,6 +52,7 @@
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/LoopPass.h"
#include "llvm/Support/CFG.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Utils/Local.h"
@@ -72,11 +73,9 @@
STATISTIC(NumElimRem , "Number of IV remainder operations eliminated");
STATISTIC(NumElimCmp , "Number of IV comparisons eliminated");
-// DisableIVRewrite mode currently affects IVUsers, so is defined in libAnalysis
-// and referenced here.
-namespace llvm {
- extern bool DisableIVRewrite;
-}
+static cl::opt<bool> DisableIVRewrite(
+ "disable-iv-rewrite", cl::Hidden,
+ cl::desc("Disable canonical induction variable rewriting"));
namespace {
class IndVarSimplify : public LoopPass {
@@ -104,7 +103,8 @@
AU.addRequired<ScalarEvolution>();
AU.addRequiredID(LoopSimplifyID);
AU.addRequiredID(LCSSAID);
- AU.addRequired<IVUsers>();
+ if (!DisableIVRewrite)
+ AU.addRequired<IVUsers>();
AU.addPreserved<ScalarEvolution>();
AU.addPreservedID(LoopSimplifyID);
AU.addPreservedID(LCSSAID);