Make EmitAggregateCopy take an alignment argument. Make EmitFinalDestCopy pass in the correct alignment when known.

The test includes a FIXME for a related case involving calls; it's a bit more complicated to fix because the RValue class doesn't keep track of alignment.

<rdar://problem/10463337>
  

llvm-svn: 145862

1 files changed, 31 insertions, 0 deletions

diff --git a/clang/test/CodeGen/packed-nest-unpacked.c b/clang/test/CodeGen/packed-nest-unpacked.c
new file mode 100644
index 00000000000..af1508ae81d
--- /dev/null
+++ b/clang/test/CodeGen/packed-nest-unpacked.c
@@ -0,0 +1,31 @@
+// RUN: %clang_cc1 %s -triple x86_64-apple-macosx10.7.2 -emit-llvm -o - | FileCheck %s
+// <rdar://problem/10463337>
+
+struct X { int x[6]; };
+struct Y { char x[13]; struct X y; } __attribute((packed));
+struct Y g;
+void f(struct X);
+
+struct X test1() {
+  // CHECK: @test1
+  // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* {{.*}}, i8* bitcast (%struct.X* getelementptr inbounds (%struct.Y* @g, i32 0, i32 1) to i8*), i64 24, i32 1, i1 false)
+  return g.y;
+}
+struct X test2() {
+  // CHECK: @test2
+  // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* {{.*}}, i8* bitcast (%struct.X* getelementptr inbounds (%struct.Y* @g, i32 0, i32 1) to i8*), i64 24, i32 1, i1 false)
+  struct X a = g.y;
+  return a;
+}
+
+void test3(struct X a) {
+  // CHECK: @test3
+  // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* bitcast (%struct.X* getelementptr inbounds (%struct.Y* @g, i32 0, i32 1) to i8*), i8* {{.*}}, i64 24, i32 1, i1 false)
+  g.y = a;
+}
+
+void test4() {
+  // CHECK: @test4
+  // FIXME: call void @llvm.memcpy.p0i8.p0i8.i64(i8* {{.*}}, i8* bitcast (%struct.X* getelementptr inbounds (%struct.Y* @g, i32 0, i32 1) to i8*), i64 24, i32 1, i1 false)
+  f(g.y);
+}