[CodeGen] Attach InlineHint to more functions

For instantiated functions, search the template pattern to see if it marked
inline to determine if InlineHint attribute should be added to the function.

llvm-svn: 344987

1 files changed, 13 insertions, 3 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index c8e672a5672..8faaed1ec90 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1299,9 +1299,19 @@ void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
     // Otherwise, propagate the inline hint attribute and potentially use its
     // absence to mark things as noinline.
     if (auto *FD = dyn_cast<FunctionDecl>(D)) {
-      if (any_of(FD->redecls(), [&](const FunctionDecl *Redecl) {
-            return Redecl->isInlineSpecified();
-          })) {
+      // Search function and template pattern redeclarations for inline.
+      auto CheckForInline = [](const FunctionDecl *FD) {
+        auto CheckRedeclForInline = [](const FunctionDecl *Redecl) {
+          return Redecl->isInlineSpecified();
+        };
+        if (any_of(FD->redecls(), CheckRedeclForInline))
+          return true;
+        const FunctionDecl *Pattern = FD->getTemplateInstantiationPattern();
+        if (!Pattern)
+          return false;
+        return any_of(Pattern->redecls(), CheckRedeclForInline);
+      };
+      if (CheckForInline(FD)) {
         B.addAttribute(llvm::Attribute::InlineHint);
       } else if (CodeGenOpts.getInlining() ==
                      CodeGenOptions::OnlyHintInlining &&