From 55f4ab84e567ac101d70f052771d1bc67a7560e3 Mon Sep 17 00:00:00 2001
From: Nick Lewycky <nicholas@mxc.ca>
Date: Sat, 25 Feb 2012 10:56:28 +0000
Subject: [PATCH] Move isKnownNonNull from private implementation detail of
 BasicAA to a public function that others can use, next to
 llvm::isIdentifiedObject.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151446 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Analysis/AliasAnalysis.h |  5 +++++
 lib/Analysis/AliasAnalysis.cpp        | 16 ++++++++++++++++
 lib/Analysis/BasicAliasAnalysis.cpp   | 16 ----------------
 3 files changed, 21 insertions(+), 16 deletions(-)

diff --git a/include/llvm/Analysis/AliasAnalysis.h b/include/llvm/Analysis/AliasAnalysis.h
index 7c9bdd973c7..b823f71a221 100644
--- a/include/llvm/Analysis/AliasAnalysis.h
+++ b/include/llvm/Analysis/AliasAnalysis.h
@@ -568,6 +568,11 @@ 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
diff --git a/lib/Analysis/AliasAnalysis.cpp b/lib/Analysis/AliasAnalysis.cpp
index bd132c05c32..95c834b451c 100644
--- a/lib/Analysis/AliasAnalysis.cpp
+++ b/lib/Analysis/AliasAnalysis.cpp
@@ -440,3 +440,19 @@ 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;
+}
diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index a831cf2846a..4a55c219cb6 100644
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -42,22 +42,6 @@ using namespace llvm;
 // Useful predicates
 //===----------------------------------------------------------------------===//
 
-/// isKnownNonNull - Return true if we know that the specified value is never
-/// null.
-static bool 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;
-}
-
 /// isNonEscapingLocalObject - Return true if the pointer is to a function-local
 /// object that never escapes from the function.
 static bool isNonEscapingLocalObject(const Value *V) {