Make CPUDispatch resolver emit dependent functions.

Inline cpu_specific versions referenced before the cpu_dispatch function
weren't properly emitted, since they hadn't been referred to.  This
patch ensures that during resolver generation that all appropriate
versions are emitted.

Change-Id: I94c3766aaf9c75ca07a0ad8258efdbb834654ff8
llvm-svn: 348600

1 files changed, 13 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 81304493a3a..b80a43b7eb2 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -2585,11 +2585,22 @@ void CodeGenModule::emitCPUDispatchDefinition(GlobalDecl GD) {
 
     llvm::Constant *Func = GetGlobalValue(MangledName);
 
-    if (!Func)
+    if (!Func) {
+      GlobalDecl ExistingDecl = Manglings.lookup(MangledName);
+      if (ExistingDecl.getDecl() &&
+          ExistingDecl.getDecl()->getAsFunction()->isDefined()) {
+        EmitGlobalFunctionDefinition(ExistingDecl, nullptr);
+        Func = GetGlobalValue(MangledName);
+      } else {
+        if (!ExistingDecl.getDecl())
+          ExistingDecl = GD.getWithMultiVersionIndex(Index);
+
       Func = GetOrCreateLLVMFunction(
-          MangledName, DeclTy, GD.getWithMultiVersionIndex(Index),
+          MangledName, DeclTy, ExistingDecl,
           /*ForVTable=*/false, /*DontDefer=*/true,
           /*IsThunk=*/false, llvm::AttributeList(), ForDefinition);
+      }
+    }
 
     llvm::SmallVector<StringRef, 32> Features;
     Target.getCPUSpecificCPUDispatchFeatures(II->getName(), Features);