From 8dcd17c938a11fe7b16592a70170cc850c45dcc1 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 26 Feb 2003 19:57:10 +0000
Subject: [PATCH] Add new -no-aa implementation

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5641 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/AliasAnalysis.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/lib/Analysis/AliasAnalysis.cpp b/lib/Analysis/AliasAnalysis.cpp
index 4816a67d102..a85d28daf2b 100644
--- a/lib/Analysis/AliasAnalysis.cpp
+++ b/lib/Analysis/AliasAnalysis.cpp
@@ -97,3 +97,22 @@ bool AliasAnalysis::canInstructionRangeModify(const Instruction &I1,
 extern void BasicAAStub();
 static IncludeFile INCLUDE_BASICAA_CPP((void*)&BasicAAStub);
 
+
+namespace {
+  struct NoAA : public ImmutablePass, public AliasAnalysis {
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AliasAnalysis::getAnalysisUsage(AU);
+    }
+    
+    virtual void initializePass() {
+      InitializeAliasAnalysis(this);
+    }
+  };
+ 
+  // Register this pass...
+  RegisterOpt<NoAA>
+  X("no-aa", "No Alias Analysis (always returns 'may' alias)");
+
+  // Declare that we implement the AliasAnalysis interface
+  RegisterAnalysisGroup<AliasAnalysis, NoAA> Y;
+}  // End of anonymous namespace