[pr19844] Add thread local mode to aliases.

This matches gcc's behavior. It also seems natural given that aliases
contain other properties that govern how it is accessed (linkage,
visibility, dll storage).

Clang still has to be updated to expose this feature to C.

llvm-svn: 209759

1 files changed, 6 insertions, 9 deletions

diff --git a/llvm/lib/Target/TargetMachine.cpp b/llvm/lib/Target/TargetMachine.cpp
index 8365f64dc54..95c8cb66f40 100644
--- a/llvm/lib/Target/TargetMachine.cpp
+++ b/llvm/lib/Target/TargetMachine.cpp
@@ -88,8 +88,8 @@ CodeModel::Model TargetMachine::getCodeModel() const {
 }
 
 /// Get the IR-specified TLS model for Var.
-static TLSModel::Model getSelectedTLSModel(const GlobalVariable *Var) {
-  switch (Var->getThreadLocalMode()) {
+static TLSModel::Model getSelectedTLSModel(const GlobalValue *GV) {
+  switch (GV->getThreadLocalMode()) {
   case GlobalVariable::NotThreadLocal:
     llvm_unreachable("getSelectedTLSModel for non-TLS variable");
     break;
@@ -127,13 +127,10 @@ TLSModel::Model TargetMachine::getTLSModel(const GlobalValue *GV) const {
       Model = TLSModel::InitialExec;
   }
 
-  const GlobalVariable *Var = dyn_cast<GlobalVariable>(GV);
-  if (Var) {
-    // If the user specified a more specific model, use that.
-    TLSModel::Model SelectedModel = getSelectedTLSModel(Var);
-    if (SelectedModel > Model)
-      return SelectedModel;
-  }
+  // If the user specified a more specific model, use that.
+  TLSModel::Model SelectedModel = getSelectedTLSModel(GV);
+  if (SelectedModel > Model)
+    return SelectedModel;
 
   return Model;
 }