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indvars --disable-iv-rewrite: sever ties with IVUsers.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133988 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2011-06-28 03:01:46 +00:00
parent 15832f6177
commit 56caa09808
2 changed files with 6 additions and 21 deletions
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12
lib/Transforms/Scalar/IndVarSimplify.cpp
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@@ -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(NumElimExt , "Number of IV sign/zero extends eliminated");
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 @@ namespace {
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);