add multi-arch asm! label operand test

Author: tshepang

src/tools/compiletest/src/directives/directive_names.rs

@@ -191,6 +191,7 @@ pub(crate) const KNOWN_DIRECTIVE_NAMES: &[&str] = &[
     "only-aarch64-unknown-linux-gnu",
     "only-apple",
     "only-arm",
+    "only-arm64ec",
     "only-avr",
     "only-beta",
     "only-bpf",
@@ -217,6 +218,7 @@ pub(crate) const KNOWN_DIRECTIVE_NAMES: &[&str] = &[
     "only-nightly",
     "only-nvptx64",
     "only-powerpc",
+    "only-riscv32",
     "only-riscv64",
     "only-rustc_abi-x86-sse2",
     "only-s390x",

tests/ui/asm/label-operand.rs

@@ -0,0 +1,53 @@
+//@ run-pass
+//@ reference: asm.operand-type.supported-operands.label
+//@ revisions: aarch64 arm arm64ec riscv32 riscv64 x86 x86_64
+//@ needs-asm-support
+//@[aarch64] only-aarch64
+//@[arm64ec] only-arm64ec
+//@[arm] only-arm
+//@[riscv32] only-riscv32
+//@[riscv64] only-riscv64
+//@[x86] only-x86
+//@[x86_64] only-x86_64
+
+#[cfg(any(aarch64, arm, arm64ec))]
+fn make_true(value: &mut bool) {
+    unsafe {
+        core::arch::asm!(
+            "b {}",
+            label {
+                *value = true;
+            }
+        );
+    }
+}
+
+#[cfg(any(riscv32, riscv64))]
+fn make_true(value: &mut bool) {
+    unsafe {
+        core::arch::asm!(
+            "j {}",
+            label {
+                *value = true;
+            }
+        );
+    }
+}
+
+#[cfg(any(x86, x86_64))]
+fn make_true(value: &mut bool) {
+    unsafe {
+        core::arch::asm!(
+            "jmp {}",
+            label {
+                *value = true;
+            }
+        );
+    }
+}
+
+fn main() {
+    let mut value = false;
+    make_true(&mut value);
+    assert!(value);
+}