Move isKnownNonNull out of AliasAnalysis.h and into ValueTracking.cpp since

it isn't really an AliasAnalysis concept, and ValueTracking has similar things
that it could plausibly share code with some day.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174027 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/AliasAnalysis.h

@@ -593,11 +593,6 @@ bool isNoAliasCall(const Value *V);
 ///
 bool isIdentifiedObject(const Value *V);
 
-/// isKnownNonNull - Return true if this pointer couldn't possibly be null by
-/// its definition.  This returns true for allocas, non-extern-weak globals and
-/// byval arguments.
-bool isKnownNonNull(const Value *V);
-
 } // End llvm namespace
 
 #endif

include/llvm/Analysis/ValueTracking.h

@@ -183,6 +183,11 @@ namespace llvm {
   bool isSafeToSpeculativelyExecute(const Value *V,
                                     const DataLayout *TD = 0);
 
+  /// isKnownNonNull - Return true if this pointer couldn't possibly be null by
+  /// its definition.  This returns true for allocas, non-extern-weak globals
+  /// and byval arguments.
+  bool isKnownNonNull(const Value *V);
+
 } // end namespace llvm
 
 #endif

lib/Analysis/AliasAnalysis.cpp

@@ -555,19 +555,3 @@ bool llvm::isIdentifiedObject(const Value *V) {
     return A->hasNoAliasAttr() || A->hasByValAttr();
   return false;
 }
-
-/// isKnownNonNull - Return true if we know that the specified value is never
-/// null.
-bool llvm::isKnownNonNull(const Value *V) {
-  // Alloca never returns null, malloc might.
-  if (isa<AllocaInst>(V)) return true;
-
-  // A byval argument is never null.
-  if (const Argument *A = dyn_cast<Argument>(V))
-    return A->hasByValAttr();
-
-  // Global values are not null unless extern weak.
-  if (const GlobalValue *GV = dyn_cast<GlobalValue>(V))
-    return !GV->hasExternalWeakLinkage();
-  return false;
-}

lib/Analysis/LazyValueInfo.cpp

@@ -16,7 +16,6 @@
 #include "llvm/Analysis/LazyValueInfo.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/Analysis/AliasAnalysis.h"
 #include "llvm/Analysis/ConstantFolding.h"
 #include "llvm/Analysis/ValueTracking.h"
 #include "llvm/IR/Constants.h"

lib/Analysis/ValueTracking.cpp

@@ -2014,3 +2014,19 @@ bool llvm::isSafeToSpeculativelyExecute(const Value *V,
     return false; // Misc instructions which have effects
   }
 }
+
+/// isKnownNonNull - Return true if we know that the specified value is never
+/// null.
+bool llvm::isKnownNonNull(const Value *V) {
+  // Alloca never returns null, malloc might.
+  if (isa<AllocaInst>(V)) return true;
+
+  // A byval argument is never null.
+  if (const Argument *A = dyn_cast<Argument>(V))
+    return A->hasByValAttr();
+
+  // Global values are not null unless extern weak.
+  if (const GlobalValue *GV = dyn_cast<GlobalValue>(V))
+    return !GV->hasExternalWeakLinkage();
+  return false;
+}