[llvm-commits] CVS: llvm/lib/Analysis/AliasSetTracker.cpp

[Chris Lattner]

Changes in directory llvm/lib/Analysis:

AliasSetTracker.cpp updated: 1.10 -> 1.11

---
Log message:

Don't be COMPLETELY pessimistic in the face of function calls


---
Diffs of the changes:  (+20 -4)

Index: llvm/lib/Analysis/AliasSetTracker.cpp
diff -u llvm/lib/Analysis/AliasSetTracker.cpp:1.10 llvm/lib/Analysis/AliasSetTracker.cpp:1.11
--- llvm/lib/Analysis/AliasSetTracker.cpp:1.10	Thu Dec 18 02:11:56 2003
+++ llvm/lib/Analysis/AliasSetTracker.cpp	Sun Mar 14 22:08:36 2004
@@ -93,9 +93,21 @@
   RefCount++;               // Entry points to alias set...
 }
 
-void AliasSet::addCallSite(CallSite CS) {
+void AliasSet::addCallSite(CallSite CS, AliasAnalysis &AA) {
   CallSites.push_back(CS);
-  AliasTy = MayAlias;         // FIXME: Too conservative?
+
+  if (Function *F = CS.getCalledFunction()) {
+    if (AA.doesNotAccessMemory(F))
+      return;
+    else if (AA.onlyReadsMemory(F)) {
+      AliasTy = MayAlias;
+      AccessTy = Refs;
+      return;
+    }
+  }
+
+  // FIXME: This should use mod/ref information to make this not suck so bad
+  AliasTy = MayAlias;
   AccessTy = ModRef;
 }
 
@@ -129,7 +141,11 @@
 }
 
 bool AliasSet::aliasesCallSite(CallSite CS, AliasAnalysis &AA) const {
-  // FIXME: Too conservative!
+  // FIXME: Use mod/ref information to prune this better!
+  if (Function *F = CS.getCalledFunction())
+    if (AA.doesNotAccessMemory(F))
+      return false;
+
   return true;
 }
 
@@ -213,7 +229,7 @@
     AliasSets.push_back(AliasSet());
     AS = &AliasSets.back();
   }
-  AS->addCallSite(CS); 
+  AS->addCallSite(CS, AA); 
 }
 
 void AliasSetTracker::add(Instruction *I) {