Add test case for the clobber options

tests/codegen/asm-clobber_abi-avr.rs

@@ -0,0 +1,43 @@
+//@ assembly-output: emit-asm
+//@ compile-flags: --target avr-unknown-gnu-atmega328
+//@ needs-llvm-components: avr
+
+#![crate_type = "rlib"]
+#![feature(no_core, rustc_attrs, lang_items, asm_experimental_arch)]
+#![no_core]
+
+#[lang = "sized"]
+trait Sized {}
+
+#[rustc_builtin_macro]
+macro_rules! asm {
+    () => {};
+}
+
+// CHECK-LABEL: @sreg_is_clobbered
+// CHECK: void asm sideeffect "", "~{sreg}"()
+#[no_mangle]
+pub unsafe fn sreg_is_clobbered() {
+    asm!("", options(nostack, nomem));
+}
+
+// CHECK-LABEL: @sreg_is_not_clobbered_if_preserve_flags_is_used
+// CHECK: void asm sideeffect "", ""()
+#[no_mangle]
+pub unsafe fn sreg_is_not_clobbered_if_preserve_flags_is_used() {
+    asm!("", options(nostack, nomem, preserves_flags));
+}
+
+// CHECK-LABEL: @clobber_abi
+// CHECK: asm sideeffect "", "={r18},={r19},={r20},={r21},={r22},={r23},={r24},={r25},={r26},={r27},={r30},={r31},~{sreg}"()
+#[no_mangle]
+pub unsafe fn clobber_abi() {
+    asm!("", clobber_abi("C"), options(nostack, nomem));
+}
+
+// CHECK-LABEL: @clobber_abi_with_preserved_flags
+// CHECK: asm sideeffect "", "={r18},={r19},={r20},={r21},={r22},={r23},={r24},={r25},={r26},={r27},={r30},={r31}"()
+#[no_mangle]
+pub unsafe fn clobber_abi_with_preserved_flags() {
+    asm!("", clobber_abi("C"), options(nostack, nomem, preserves_flags));
+}