Rollup merge of #83841 - Amanieu:asm_clobber_feature, r=nagisa

Allow clobbering unsupported registers in asm!

Previously registers could only be marked as clobbered if the target feature for that register was enabled. This restriction is now removed.

cc #81092

r? ``@nagisa``

1 files changed, 21 insertions, 0 deletions

diff --git a/src/test/codegen/asm-target-clobbers.rs b/src/test/codegen/asm-target-clobbers.rs
new file mode 100644
index 00000000000..f637cdcd234
--- /dev/null
+++ b/src/test/codegen/asm-target-clobbers.rs
@@ -0,0 +1,21 @@
+// only-x86_64
+// revisions: base avx512
+// [avx512]compile-flags: -C target-feature=+avx512f
+
+#![crate_type = "rlib"]
+#![feature(asm)]
+
+// CHECK-LABEL: @avx512_clobber
+// base: call void asm sideeffect inteldialect "", "~{xmm31}"()
+// avx512: call float asm sideeffect inteldialect "", "=&{xmm31}"()
+#[no_mangle]
+pub unsafe fn avx512_clobber() {
+    asm!("", out("zmm31") _, options(nostack, nomem, preserves_flags));
+}
+
+// CHECK-LABEL: @eax_clobber
+// CHECK: call i32 asm sideeffect inteldialect "", "=&{ax}"()
+#[no_mangle]
+pub unsafe fn eax_clobber() {
+    asm!("", out("eax") _, options(nostack, nomem, preserves_flags));
+}