implement rdar://7346691 by codegen'ing struct/array initializers

to a memset or a memcpy from a global when possible.

llvm-svn: 90658

1 files changed, 28 insertions, 0 deletions

diff --git a/clang/test/CodeGen/decl.c b/clang/test/CodeGen/decl.c
index e2d55ecaf1c..b26843132c2 100644
--- a/clang/test/CodeGen/decl.c
+++ b/clang/test/CodeGen/decl.c
@@ -1,6 +1,9 @@
 // RUN: clang-cc -emit-llvm < %s | FileCheck %s
 
 // CHECK: @test1.x = internal constant [12 x i32] [i32 1
+// CHECK: @test2.x = internal constant [13 x i32] [i32 1,
+
+#include <string.h>
 
 void test1() {
   // This should codegen as a "@test1.x" global.
@@ -10,3 +13,28 @@ void test1() {
 // CHECK: @test1()
 // CHECK: {{call.*@foo.*@test1.x}}
 }
+
+
+// rdar://7346691
+void test2() {
+  // This should codegen as a "@test2.x" global + memcpy.
+  int x[] = { 1, 2, 3, 4, 6, 8, 9, 10, 123, 231, 123,23, 24 };
+  foo(x);
+  
+  // CHECK: @test2()
+  // CHECK: %x = alloca [13 x i32]
+  // CHECK: call void @llvm.memcpy
+  // CHECK: call{{.*}}@foo{{.*}}i32* %
+}
+
+
+void test3() {
+  // This should codegen as a "@test3.x" global + memcpy.
+  int x[100] = { 0 };
+  foo(x);
+  
+  // CHECK: @test3()
+  // CHECK: %x = alloca [100 x i32]
+  // CHECK: call void @llvm.memset
+}
+