check that target features don't leak out of a naked function

Author: folkertdev

tests/ui/asm/naked-functions-no-leak-target-feature-aarch64.rs

@@ -0,0 +1,27 @@
+//@ add-core-stubs
+//@ compile-flags: --target aarch64-unknown-linux-gnu
+//@ build-fail
+//@ needs-llvm-components: arm
+
+#![crate_type = "lib"]
+#![feature(no_core, naked_functions)]
+#![no_core]
+
+extern crate minicore;
+use minicore::*;
+
+// check that a naked function using target features does not keep these features enabled
+// for subsequent asm blocks.
+
+#[no_mangle]
+#[naked]
+#[target_feature(enable = "i8mm")]
+unsafe extern "C" fn a() {
+    naked_asm!("usdot   v0.4s, v1.16b, v2.4b[3]")
+}
+
+#[no_mangle]
+#[naked]
+unsafe extern "C" fn b() {
+    naked_asm!("usdot   v0.4s, v1.16b, v2.4b[3]")
+}

tests/ui/asm/naked-functions-no-leak-target-feature-aarch64.stderr

@@ -0,0 +1,18 @@
+error: instruction requires: i8mm
+   |
+note: instantiated into assembly here
+  --> <inline asm>:16:1
+   |
+LL | usdot   v0.4s, v1.16b, v2.4b[3]
+   | ^
+
+error: instruction requires: i8mm
+   |
+note: instantiated into assembly here
+  --> <inline asm>:16:1
+   |
+LL | usdot   v0.4s, v1.16b, v2.4b[3]
+   | ^
+
+error: aborting due to 2 previous errors
+