From a3355ffb3d30d19d226bbb75707991c60f236e37 Mon Sep 17 00:00:00 2001
From: Duncan Sands <baldrick@free.fr>
Date: Mon, 3 Dec 2007 20:06:50 +0000
Subject: Rather than having special rules like "intrinsics cannot throw
 exceptions", just mark intrinsics with the nounwind attribute.  Likewise,
 mark intrinsics as readnone/readonly and get rid of special aliasing logic
 (which didn't use anything more than this anyway).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44544 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/BasicAliasAnalysis.cpp | 37 -------------------------------------
 1 file changed, 37 deletions(-)

(limited to 'lib/Analysis/BasicAliasAnalysis.cpp')

diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index 5ec9afaec9..99d9499a52 100644
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -25,8 +25,6 @@
 #include "llvm/Pass.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/GetElementPtrTypeIterator.h"
@@ -116,9 +114,6 @@ namespace {
     /// global) or not.
     bool pointsToConstantMemory(const Value *P);
 
-    virtual ModRefBehavior getModRefBehavior(Function *F, CallSite CS,
-                                          std::vector<PointerAccessInfo> *Info);
-
   private:
     // CheckGEPInstructions - Check two GEP instructions with known
     // must-aliasing base pointers.  This checks to see if the index expressions
@@ -810,37 +805,5 @@ BasicAliasAnalysis::CheckGEPInstructions(
   return MayAlias;
 }
 
-static ManagedStatic<BitVector> NoMemoryIntrinsics;
-static ManagedStatic<BitVector> OnlyReadsMemoryIntrinsics;
-
-AliasAnalysis::ModRefBehavior
-BasicAliasAnalysis::getModRefBehavior(Function *F, CallSite CS,
-                                      std::vector<PointerAccessInfo> *Info) {
-  if (!F->isDeclaration()) return UnknownModRefBehavior;
-
-  static bool Initialized = false;
-  if (!Initialized) {
-    NoMemoryIntrinsics->resize(Intrinsic::num_intrinsics);
-    OnlyReadsMemoryIntrinsics->resize(Intrinsic::num_intrinsics);
-#define GET_MODREF_BEHAVIOR
-#include "llvm/Intrinsics.gen"
-#undef GET_MODREF_BEHAVIOR
-    
-    Initialized = true;
-  }
-
-  // If this is an intrinsic, we can use lookup tables
-  if (unsigned id = F->getIntrinsicID()) {
-    if (NoMemoryIntrinsics->test(id))
-      return DoesNotAccessMemory;
-    if (OnlyReadsMemoryIntrinsics->test(id))
-      return OnlyReadsMemory;
-
-    return UnknownModRefBehavior;
-  }
-
-  return UnknownModRefBehavior;
-}
-
 // Make sure that anything that uses AliasAnalysis pulls in this file...
 DEFINING_FILE_FOR(BasicAliasAnalysis)
-- 
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