Rollup merge of #131310 - taiki-e:msp430-clobber-abi, r=Amanieu

Support clobber_abi in MSP430 inline assembly

This supports `clobber_abi` which is one of the requirements of stabilization mentioned in #93335.

Refs: Section 3.2 "Register Conventions" in [MSP430 Embedded Application Binary Interface](https://www.ti.com/lit/an/slaa534a/slaa534a.pdf)

cc ``@cr1901``

r? ``@Amanieu``

``@rustbot`` label +O-msp430

1 files changed, 36 insertions, 0 deletions

diff --git a/tests/codegen/asm-msp430-clobbers.rs b/tests/codegen/asm-msp430-clobbers.rs
new file mode 100644
index 00000000000..c00c04f3088
--- /dev/null
+++ b/tests/codegen/asm-msp430-clobbers.rs
@@ -0,0 +1,36 @@
+//@ assembly-output: emit-asm
+//@ compile-flags: --target msp430-none-elf
+//@ needs-llvm-components: msp430
+
+#![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: @sr_clobber
+// CHECK: call void asm sideeffect "", "~{sr}"()
+#[no_mangle]
+pub unsafe fn sr_clobber() {
+    asm!("", options(nostack, nomem));
+}
+
+// CHECK-LABEL: @no_clobber
+// CHECK: call void asm sideeffect "", ""()
+#[no_mangle]
+pub unsafe fn no_clobber() {
+    asm!("", options(nostack, nomem, preserves_flags));
+}
+
+// CHECK-LABEL: @clobber_abi
+// CHECK: asm sideeffect "", "={r11},={r12},={r13},={r14},={r15}"()
+#[no_mangle]
+pub unsafe fn clobber_abi() {
+    asm!("", clobber_abi("C"), options(nostack, nomem, preserves_flags));
+}