emit padding as undef values, take 2

merge also a few tests I had here for this feature, and FileCheck'ize one file

llvm-svn: 101535

1 files changed, 23 insertions, 11 deletions

diff --git a/clang/test/CodeGen/designated-initializers.c b/clang/test/CodeGen/designated-initializers.c
index 652238f06d5..1ad5e6c028a 100644
--- a/clang/test/CodeGen/designated-initializers.c
+++ b/clang/test/CodeGen/designated-initializers.c
@@ -1,22 +1,34 @@
-// RUN: %clang_cc1 -triple i386-unknown-unknown %s -emit-llvm -o %t
-// RUN: grep "{ i8\* null, i32 1024 }" %t
-// RUN: grep "i32 0, i32 22" %t
+// RUN: %clang_cc1 -triple i386-unknown-unknown %s -emit-llvm -o - | FileCheck %s
 
 struct foo {
     void *a;
     int b;
 };
 
+// CHECK: @u = global %union.anon zeroinitializer
 union { int i; float f; } u = { };
 
-int main(int argc, char **argv)
-{
-  union { int i; float f; } u2 = { };
-    static struct foo foo = {
-        .b = 1024,
-    };
-}
+// CHECK: @u2 = global %0 { i32 0, [4 x i8] undef }
+union { int i; double f; } u2 = { };
 
+// CHECK: @b = global [2 x i32] [i32 0, i32 22]
 int b[2] = {
-    [1] 22
+  [1] = 22
 };
+
+int main(int argc, char **argv)
+{
+  // CHECK: internal global %struct.foo { i8* null, i32 1024 }
+  static struct foo foo = {
+    .b = 1024,
+  };
+
+  // CHECK: bitcast %union.anon* %u2
+  // CHECK: call void @llvm.memset
+   union { int i; float f; } u2 = { };
+
+  // CHECK-NOT: call void @llvm.memset
+  union { int i; float f; } u3;
+
+  // CHECK: ret i32
+}