First set of tests for ARM homogenous aggregates. C only. C++ will follow.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154666 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/arm-homogenous.c b/test/CodeGen/arm-homogenous.c
new file mode 100644
index 0000000..814fde5
--- /dev/null
+++ b/test/CodeGen/arm-homogenous.c
@@ -0,0 +1,158 @@
+// RUN: %clang_cc1 -triple armv7---eabi -target-abi aapcs -mfloat-abi hard -emit-llvm %s -o - | FileCheck %s
+#include <stdint.h>
+
+/* This is not a homogenous aggregate - fundamental types are different */
+typedef union {
+  float       f[4];
+  uint32_t    i[4];
+} union_with_first_floats;
+union_with_first_floats g_u_f;
+
+extern void takes_union_with_first_floats(union_with_first_floats a);
+extern union_with_first_floats returns_union_with_first_floats(void);
+
+void test_union_with_first_floats(void) {
+  takes_union_with_first_floats(g_u_f);
+}
+// CHECK: declare arm_aapcs_vfpcc void @takes_union_with_first_floats([4 x i32])
+
+void test_return_union_with_first_floats(void) {
+  g_u_f = returns_union_with_first_floats();
+}
+// CHECK: declare arm_aapcs_vfpcc void @returns_union_with_first_floats(%union.union_with_first_floats* sret)
+
+/* This is not a homogenous aggregate - fundamental types are different */
+typedef union {
+    uint32_t    i[4];
+    float       f[4];
+} union_with_non_first_floats;
+union_with_non_first_floats g_u_nf_f;
+
+extern void takes_union_with_non_first_floats(union_with_non_first_floats a);
+extern union_with_non_first_floats returns_union_with_non_first_floats(void);
+
+void test_union_with_non_first_floats(void) {
+  takes_union_with_non_first_floats(g_u_nf_f);
+}
+// CHECK: declare arm_aapcs_vfpcc void @takes_union_with_non_first_floats([4 x i32])
+
+void test_return_union_with_non_first_floats(void) {
+  g_u_nf_f = returns_union_with_non_first_floats();
+}
+// CHECK: declare arm_aapcs_vfpcc void @returns_union_with_non_first_floats(%union.union_with_non_first_floats* sret)
+
+/* This is not a homogenous aggregate - fundamental types are different */
+typedef struct {
+  float a;
+  union_with_first_floats b;
+} struct_with_union_with_first_floats;
+struct_with_union_with_first_floats g_s_f;
+
+extern void takes_struct_with_union_with_first_floats(struct_with_union_with_first_floats a);
+extern struct_with_union_with_first_floats returns_struct_with_union_with_first_floats(void);
+
+void test_struct_with_union_with_first_floats(void) {
+  takes_struct_with_union_with_first_floats(g_s_f);
+}
+// CHECK: declare arm_aapcs_vfpcc void @takes_struct_with_union_with_first_floats([5 x i32])
+
+void test_return_struct_with_union_with_first_floats(void) {
+  g_s_f = returns_struct_with_union_with_first_floats();
+}
+// CHECK: declare arm_aapcs_vfpcc void @returns_struct_with_union_with_first_floats(%struct.struct_with_union_with_first_floats* sret)
+
+/* This is not a homogenous aggregate - fundamental types are different */
+typedef struct {
+  float a;
+  union_with_non_first_floats b;
+} struct_with_union_with_non_first_floats;
+struct_with_union_with_non_first_floats g_s_nf_f;
+
+extern void takes_struct_with_union_with_non_first_floats(struct_with_union_with_non_first_floats a);
+extern struct_with_union_with_non_first_floats returns_struct_with_union_with_non_first_floats(void);
+
+void test_struct_with_union_with_non_first_floats(void) {
+  takes_struct_with_union_with_non_first_floats(g_s_nf_f);
+}
+// CHECK: declare arm_aapcs_vfpcc void @takes_struct_with_union_with_non_first_floats([5 x i32])
+
+void test_return_struct_with_union_with_non_first_floats(void) {
+  g_s_nf_f = returns_struct_with_union_with_non_first_floats();
+}
+// CHECK: declare arm_aapcs_vfpcc void @returns_struct_with_union_with_non_first_floats(%struct.struct_with_union_with_non_first_floats* sret)
+
+/* Plain array is not a homogenous aggregate */
+extern void takes_array_of_floats(float a[4]);
+void test_array_of_floats(void) {
+  float a[4] = {1.0, 2.0, 3.0, 4.0};
+  takes_array_of_floats(a);
+}
+// CHECK: declare arm_aapcs_vfpcc void @takes_array_of_floats(float*)
+
+/* Struct-type homogenous aggregate */
+typedef struct {
+  float x, y, z, w;
+} struct_with_fundamental_elems;
+struct_with_fundamental_elems g_s;
+
+extern void takes_struct_with_fundamental_elems(struct_with_fundamental_elems a);
+extern struct_with_fundamental_elems returns_struct_with_fundamental_elems(void);
+
+void test_struct_with_fundamental_elems(void) {
+  takes_struct_with_fundamental_elems(g_s);
+// CHECK:  call arm_aapcs_vfpcc  void @takes_struct_with_fundamental_elems(float {{.*}}, float {{.*}}, float{{.*}}, float {{.*}})
+}
+// CHECK: declare arm_aapcs_vfpcc void @takes_struct_with_fundamental_elems(float, float, float, float)
+
+void test_return_struct_with_fundamental_elems(void) {
+  g_s = returns_struct_with_fundamental_elems();
+// CHECK: call arm_aapcs_vfpcc  %struct.struct_with_fundamental_elems @returns_struct_with_fundamental_elems()
+}
+// CHECK: declare arm_aapcs_vfpcc %struct.struct_with_fundamental_elems @returns_struct_with_fundamental_elems()
+
+/* Array-type homogenous aggregate */
+typedef struct {
+  float xyzw[4];
+} struct_with_array;
+struct_with_array g_s_a;
+
+extern void takes_struct_with_array(struct_with_array a);
+extern struct_with_array returns_struct_with_array(void);
+
+void test_struct_with_array(void) {
+  takes_struct_with_array(g_s_a);
+// CHECK:   call arm_aapcs_vfpcc  void @takes_struct_with_array(float {{.*}}, float {{.*}}, float {{.*}}, float {{.*}})
+}
+// CHECK: declare arm_aapcs_vfpcc void @takes_struct_with_array(float, float, float, float)
+
+void test_return_struct_with_array(void) {
+  g_s_a = returns_struct_with_array();
+// CHECK:   call arm_aapcs_vfpcc  %struct.struct_with_array @returns_struct_with_array()
+}
+// CHECK: declare arm_aapcs_vfpcc %struct.struct_with_array @returns_struct_with_array()
+
+/* This union is a homogenous aggregate. Check that it's passed properly */
+typedef union {
+  struct_with_fundamental_elems xyzw;
+  float a[3];
+} union_with_struct_with_fundamental_elems;
+union_with_struct_with_fundamental_elems g_u_s_fe;
+
+extern void takes_union_with_struct_with_fundamental_elems(union_with_struct_with_fundamental_elems a);
+extern union_with_struct_with_fundamental_elems returns_union_with_struct_with_fundamental_elems(void);
+
+void test_union_with_struct_with_fundamental_elems(void) {
+  takes_union_with_struct_with_fundamental_elems(g_u_s_fe);
+// CHECK: call arm_aapcs_vfpcc  void @takes_union_with_struct_with_fundamental_elems(float {{.*}}, float {{.*}}, float {{.*}}, float {{.*}})
+}
+// CHECK: declare arm_aapcs_vfpcc void @takes_union_with_struct_with_fundamental_elems(float, float, float, float)
+
+void test_return_union_with_struct_with_fundamental_elems(void) {
+  g_u_s_fe = returns_union_with_struct_with_fundamental_elems();
+// CHECK: call arm_aapcs_vfpcc  %union.union_with_struct_with_fundamental_elems @returns_union_with_struct_with_fundamental_elems()
+}
+// CHECK: declare arm_aapcs_vfpcc %union.union_with_struct_with_fundamental_elems @returns_union_with_struct_with_fundamental_elems()
+
+// FIXME: Tests necessary:
+//         - Vectors
+//         - C++ stuff
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