Remove the MarkModRef pass (use AddReadAttrs instead).

Unfortunately this means removing one regression test
of GlobalsModRef because I couldn't work out how to
perform it without MarkModRef.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56342 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/LinkAllPasses.h

@@ -86,7 +86,6 @@ namespace {
       (void) llvm::createLowerInvokePass();
       (void) llvm::createLowerSetJmpPass();
       (void) llvm::createLowerSwitchPass();
-      (void) llvm::createMarkModRefPass();
       (void) llvm::createNoAAPass();
       (void) llvm::createNoProfileInfoPass();
       (void) llvm::createProfileLoaderPass();

include/llvm/Transforms/Scalar.h

@@ -137,12 +137,6 @@ LoopPass *createLoopRotatePass();
 //
 LoopPass *createLoopIndexSplitPass();
 
-//===----------------------------------------------------------------------===//
-//
-// MarkModRef - This pass marks functions readnone/readonly.
-//
-FunctionPass *createMarkModRefPass();
-
 //===----------------------------------------------------------------------===//
 //
 // PromoteMemoryToRegister - This pass is used to promote memory references to

lib/Transforms/Scalar/MarkModRef.cpp

@@ -1,69 +0,0 @@
-//===--------- MarkModRef.cpp - Mark functions readnone/readonly ----------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This pass marks functions readnone/readonly based on the results of alias
-// analysis.  This requires a sufficiently powerful alias analysis, such as
-// GlobalsModRef (invoke as "opt ... -globalsmodref-aa -markmodref ...").
-//
-//===----------------------------------------------------------------------===//
-
-#define DEBUG_TYPE "markmodref"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/Support/Compiler.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Function.h"
-#include "llvm/Pass.h"
-using namespace llvm;
-
-STATISTIC(NumReadNone, "Number of functions marked readnone");
-STATISTIC(NumReadOnly, "Number of functions marked readonly");
-
-namespace {
-  struct VISIBILITY_HIDDEN MarkModRef : public FunctionPass {
-    static char ID; // Pass identification, replacement for typeid
-    MarkModRef() : FunctionPass(&ID) {}
-
-    bool runOnFunction(Function &F);
-
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-      AU.setPreservesCFG();
-      AU.addRequired<AliasAnalysis>();
-      AU.addPreserved<AliasAnalysis>();
-    }
-  };
-}
-
-char MarkModRef::ID = 0;
-static RegisterPass<MarkModRef>
-X("markmodref", "Mark functions readnone/readonly");
-
-bool MarkModRef::runOnFunction(Function &F) {
-  // FIXME: Wrong for functions with weak linkage.
-  if (F.doesNotAccessMemory())
-    // Cannot do better.
-    return false;
-
-  AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
-  AliasAnalysis::ModRefBehavior ModRef = AA.getModRefBehavior(&F);
-  if (ModRef == AliasAnalysis::DoesNotAccessMemory) {
-    F.setDoesNotAccessMemory();
-    NumReadNone++;
-    return true;
-  } else if (ModRef == AliasAnalysis::OnlyReadsMemory && !F.onlyReadsMemory()) {
-    F.setOnlyReadsMemory();
-    NumReadOnly++;
-    return true;
-  }
-  return false;
-}
-
-FunctionPass *llvm::createMarkModRefPass() {
-  return new MarkModRef();
-}

win32/Transforms/Transforms.vcproj

@@ -499,10 +499,6 @@
 					RelativePath="..\..\lib\Transforms\Scalar\LoopUnswitch.cpp"
 					>
 				</File>
-				<File
-					RelativePath="..\..\lib\Transforms\Scalar\MarkModRef.cpp"
-					>
-				</File>
 				<File
 					RelativePath="..\..\lib\Transforms\Scalar\MemCpyOptimizer.cpp"
 					>