Vendor import of llvm trunk r256945:

https://llvm.org/svn/llvm-project/llvm/trunk@256945

1 files changed, 1 insertions, 16 deletions

diff --git a/lib/Analysis/GlobalsModRef.cpp b/lib/Analysis/GlobalsModRef.cpp
index ab2263a..249f395 100644
--- a/lib/Analysis/GlobalsModRef.cpp
+++ b/lib/Analysis/GlobalsModRef.cpp
@@ -376,15 +376,6 @@ bool GlobalsAAResult::AnalyzeUsesOfPointer(Value *V,
         } else {
           return true; // Argument of an unknown call.
         }
-        // If the Callee is not ReadNone, it may read the global,
-        // and if it is not ReadOnly, it may also write to it.
-        Function *CalleeF = CS.getCalledFunction();
-        if (!CalleeF->doesNotAccessMemory()) {
-          if (Readers)
-            Readers->insert(CalleeF);
-          if (Writers && !CalleeF->onlyReadsMemory())
-            Writers->insert(CalleeF);
-        }
       }
     } else if (ICmpInst *ICI = dyn_cast<ICmpInst>(I)) {
       if (!isa<ConstantPointerNull>(ICI->getOperand(1)))
@@ -516,7 +507,7 @@ void GlobalsAAResult::AnalyzeCallGraph(CallGraph &CG, Module &M) {
 
       if (F->isDeclaration()) {
         // Try to get mod/ref behaviour from function attributes.
-        if (F->doesNotAccessMemory() || F->onlyAccessesInaccessibleMemory()) {
+        if (F->doesNotAccessMemory()) {
           // Can't do better than that!
         } else if (F->onlyReadsMemory()) {
           FI.addModRefInfo(MRI_Ref);
@@ -524,12 +515,6 @@ void GlobalsAAResult::AnalyzeCallGraph(CallGraph &CG, Module &M) {
             // This function might call back into the module and read a global -
             // consider every global as possibly being read by this function.
             FI.setMayReadAnyGlobal();
-        } else if (F->onlyAccessesArgMemory() || 
-                   F->onlyAccessesInaccessibleMemOrArgMem()) {
-          // This function may only access (read/write) memory pointed to by its
-          // arguments. If this pointer is to a global, this escaping use of the
-          // pointer is captured in AnalyzeUsesOfPointer().
-          FI.addModRefInfo(MRI_ModRef);
         } else {
           FI.addModRefInfo(MRI_ModRef);
           // Can't say anything useful unless it's an intrinsic - they don't