1 files changed, 41 insertions, 0 deletions
diff --git a/test/CodeGen/le32-regparm.c b/test/CodeGen/le32-regparm.c
new file mode 100644
index 000000000000..6ab5a11106b1
--- /dev/null
+++ b/test/CodeGen/le32-regparm.c
@@ -0,0 +1,41 @@
+// RUN: %clang_cc1 -triple le32-unknown-nacl %s -emit-llvm -o - | FileCheck %s
+
+#define FASTCALL __attribute__((regparm(2)))
+
+typedef struct {
+  int aaa;
+  double bbbb;
+  int ccc[200];
+} foo;
+
+// 2 inreg arguments are supported.
+void FASTCALL f1(int i, int j, int k);
+// CHECK: define void @f1(i32 inreg %i, i32 inreg %j, i32 %k)
+void f1(int i, int j, int k) { }
+
+// inreg structs are not supported.
+// CHECK: define void @f2(%struct.foo* inreg %a)
+void __attribute__((regparm(1))) f2(foo* a) {}
+
+// Only the first 2 arguments can be passed inreg, and the first
+// non-integral type consumes remaining available registers.
+// CHECK: define void @f3(%struct.foo* byval %a, i32 %b)
+void __attribute__((regparm(2))) f3(foo a, int b) {}
+
+// Only 64 total bits are supported
+// CHECK: define void @f4(i64 inreg %g, i32 %h)
+void __attribute__((regparm(2))) f4(long long g, int h) {}
+
+typedef void (*FType)(int, int) __attribute ((regparm (2)));
+FType bar;
+extern void FASTCALL reduced(char b, double c, foo* d, double e, int f);
+
+int
+main(void) {
+  // The presence of double c means that foo* d is not passed inreg. This
+  // behavior is different from current x86-32 behavior
+  // CHECK: call void @reduced(i8 signext inreg 0, {{.*}} %struct.foo* null
+  reduced(0, 0.0, 0, 0.0, 0);
+  // CHECK: call void {{.*}}(i32 inreg 1, i32 inreg 2)
+  bar(1,2);
+}