Add an Intraprocedural form of BasicAliasAnalysis, which aims to

properly handles instructions and arguments defined in different
functions, or across recursive function iterations.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107109 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 6 deletions

diff --git a/lib/Analysis/AliasAnalysis.cpp b/lib/Analysis/AliasAnalysis.cpp
index 371dcafa9f..d9fe2f7407 100644
--- a/lib/Analysis/AliasAnalysis.cpp
+++ b/lib/Analysis/AliasAnalysis.cpp
@@ -229,16 +229,20 @@ bool llvm::isNoAliasCall(const Value *V) {
 /// identifiable object.  This returns true for:
 ///    Global Variables and Functions (but not Global Aliases)
 ///    Allocas and Mallocs
-///    ByVal and NoAlias Arguments
-///    NoAlias returns
+///    ByVal and NoAlias Arguments, if Interprocedural is false
+///    NoAlias returns, if Interprocedural is false
 ///
-bool llvm::isIdentifiedObject(const Value *V) {
-  if (isa<AllocaInst>(V) || isNoAliasCall(V))
+bool llvm::isIdentifiedObject(const Value *V, bool Interprocedural) {
+  if (isa<AllocaInst>(V))
     return true;
   if (isa<GlobalValue>(V) && !isa<GlobalAlias>(V))
     return true;
-  if (const Argument *A = dyn_cast<Argument>(V))
-    return A->hasNoAliasAttr() || A->hasByValAttr();
+  if (!Interprocedural) {
+    if (isNoAliasCall(V))
+      return true;
+    if (const Argument *A = dyn_cast<Argument>(V))
+      return A->hasNoAliasAttr() || A->hasByValAttr();
+  }
   return false;
 }