Reapply r231508 "CodeGen: Emit constant temporaries into read-only globals."

I disabled putting the new global into the same COMDAT as the function for now.
There's a fundamental problem when we inline references to the global but still
have the global in a COMDAT linked to the inlined function. Since this is only
an optimization there may be other versions of the COMDAT around that are
missing the new global and hell breaks loose at link time.

I hope the chromium build doesn't break this time :)

llvm-svn: 231564

1 files changed, 28 insertions, 11 deletions

diff --git a/clang/test/CodeGenCXX/cxx0x-initializer-stdinitializerlist.cpp b/clang/test/CodeGenCXX/cxx0x-initializer-stdinitializerlist.cpp
index d68ba7c7537..a341842c3ab 100644
--- a/clang/test/CodeGenCXX/cxx0x-initializer-stdinitializerlist.cpp
+++ b/clang/test/CodeGenCXX/cxx0x-initializer-stdinitializerlist.cpp
@@ -72,6 +72,9 @@ namespace thread_local_global_array {
 // CHECK: @[[PARTLY_CONSTANT_SECOND:_ZGRN15partly_constant2ilE.*]] = internal global [2 x i32] zeroinitializer, align 4
 // CHECK: @[[PARTLY_CONSTANT_THIRD:_ZGRN15partly_constant2ilE.*]] = internal constant [4 x i32] [i32 5, i32 6, i32 7, i32 8], align 4
 
+// CHECK: @[[REFTMP1:.*]] = private constant [2 x i32] [i32 42, i32 43], align 4
+// CHECK: @[[REFTMP2:.*]] = private constant [3 x %{{.*}}] [%{{.*}} { i32 1 }, %{{.*}} { i32 2 }, %{{.*}} { i32 3 }], align 4
+
 // CHECK: appending global
 
 
@@ -215,17 +218,16 @@ void fn9() {
 
 struct haslist1 {
   std::initializer_list<int> il;
-  haslist1();
+  haslist1(int i);
 };
 
-// CHECK-LABEL: define void @_ZN8haslist1C2Ev
-haslist1::haslist1()
+// CHECK-LABEL: define void @_ZN8haslist1C2Ei
+haslist1::haslist1(int i)
 // CHECK: alloca [3 x i32]
-// CHECK: store i32 1
+// CHECK: store i32 %
 // CHECK: store i32 2
 // CHECK: store i32 3
-// CHECK: store i{{32|64}} 3
-  : il{1, 2, 3}
+  : il{i, 2, 3}
 {
   destroyme2 dm2;
 }
@@ -244,16 +246,15 @@ haslist2::haslist2()
   // CHECK: call void @_ZN10destroyme1D1Ev
 }
 
-void fn10() {
-  // CHECK-LABEL: define void @_Z4fn10v
+void fn10(int i) {
+  // CHECK-LABEL: define void @_Z4fn10i
   // CHECK: alloca [3 x i32]
   // CHECK: call noalias i8* @_Znw{{[jm]}}
-  // CHECK: store i32 1
+  // CHECK: store i32 %
   // CHECK: store i32 2
   // CHECK: store i32 3
   // CHECK: store i32*
-  // CHECK: store i{{32|64}} 3
-  (void) new std::initializer_list<int> {1, 2, 3};
+  (void) new std::initializer_list<int> {i, 2, 3};
 }
 
 void fn11() {
@@ -462,6 +463,22 @@ namespace PR20445 {
   template<int x> void f() { new MyClass({42, 43}); }
   template void f<0>();
   // CHECK-LABEL: define {{.*}} @_ZN7PR204451fILi0EEEvv(
+  // CHECK: store i32* getelementptr inbounds ([2 x i32]* @[[REFTMP1]], i64 0, i64 0)
   // CHECK: call void @_ZN7PR204456vectorC1ESt16initializer_listIiE(
   // CHECK: call void @_ZN7PR204457MyClassC1ERKNS_6vectorE(
 }
+
+namespace ConstExpr {
+  class C {
+    int x;
+  public:
+    constexpr C(int x) : x(x) {}
+  };
+  void f(std::initializer_list<C>);
+  void g() {
+// CHECK-LABEL: _ZN9ConstExpr1gEv
+// CHECK: store %"class.ConstExpr::C"* getelementptr inbounds ([3 x %"class.ConstExpr::C"]* @[[REFTMP2]], i64 0, i64 0)
+// CHECK: call void @_ZN9ConstExpr1fESt16initializer_listINS_1CEE
+    f({C(1), C(2), C(3)});
+  }
+}