x86_32 ABI: Don't try and expand structures with bitfields.

 - This is an ABI incompatiblity, but this is not likely to be a huge
   deal in practice. For now we at least generate self consistent code
   instead of crashing.
 - <rdar://problem/6657601> x86-32 ABI: Bitfields in small structures
   are not passed correctly

llvm-svn: 66713

1 files changed, 67 insertions, 0 deletions

diff --git a/clang/test/CodeGen/x86_32-arguments.c b/clang/test/CodeGen/x86_32-arguments.c
new file mode 100644
index 00000000000..339f16e0f79
--- /dev/null
+++ b/clang/test/CodeGen/x86_32-arguments.c
@@ -0,0 +1,67 @@
+// RUN: clang -triple i386-unknown-unknown -emit-llvm -o %t %s &&
+// RUN: grep 'define signext i8 @f0()' %t &&
+// RUN: grep 'define signext i16 @f1()' %t &&
+// RUN: grep 'define i32 @f2()' %t &&
+// RUN: grep 'define float @f3()' %t &&
+// RUN: grep 'define double @f4()' %t &&
+// RUN: grep 'define x86_fp80 @f5()' %t &&
+// RUN: grep 'define void @f6(i8 signext %a0, i16 signext %a1, i32 %a2, i64 %a3, i8\* %a4)' %t &&
+// RUN: grep 'define void @f7(i32 %a0)' %t &&
+// RUN: grep 'define i64 @f8_1()' %t && 
+// RUN: grep 'define void @f8_2(i32 %a0.0, i32 %a0.1)' %t &&
+// RUN: grep 'define i64 @f9_1()' %t &&
+
+// FIXME: This is wrong, but we want the coverage of the other
+// tests. This should be the same as @f8_2.
+// RUN: grep 'define void @f9_2(%.truct.s9\* byval %a0)' %t &&
+
+// RUN: true
+
+char f0(void) {
+}
+
+short f1(void) {
+}
+
+int f2(void) {
+}
+
+float f3(void) {
+}
+
+double f4(void) {
+}
+
+long double f5(void) {
+}
+
+void f6(char a0, short a1, int a2, long long a3, void *a4) {
+}
+
+typedef enum { A, B, C } E;
+
+void f7(E a0) {
+}
+
+struct s8 {
+  int a;
+  int b;
+};
+struct s8 f8_1(void) {
+}
+void f8_2(struct s8 a0) {
+}
+
+// This should be passed just as s8.
+
+// FIXME: This is currently broken, but the test case is accepting it
+// so we get coverage of the other cases.
+struct s9 {
+  int a : 17;
+  int b;
+};
+struct s9 f9_1(void) {
+}
+void f9_2(struct s9 a0) {
+}
+