when an enum type is completed, only flush the type cache when

the enum has already been converted.  If not, there cannot be any types
built on top of it, so there is no need to flush the cache.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134841 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/CodeGenTypes.cpp b/lib/CodeGen/CodeGenTypes.cpp
index e0baf800fbf6a879666baed7ad3d98250829c450..93754104773d64410d112e0a60075033841ae782 100644 (file)
--- a/lib/CodeGen/CodeGenTypes.cpp
+++ b/lib/CodeGen/CodeGenTypes.cpp
@@ -114,8 +114,10 @@ void CodeGenTypes::UpdateCompletedType(const TagDecl *TD) {
   // If this is an enum being completed, then we flush all non-struct types from
   // the cache.  This allows function types and other things that may be derived
   // from the enum to be recomputed.
-  if (isa<EnumDecl>(TD)) {
-    TypeCache.clear();
+  if (const EnumDecl *ED = dyn_cast<EnumDecl>(TD)) {
+    // Only flush the cache if we've actually already converted this type.
+    if (TypeCache.count(ED->getTypeForDecl()))
+      TypeCache.clear();
     return;
   }