Fix asm goto with outputs

When outputs are used together with labels, they are considered
to be written for all destinations, not only when falling through.

1 files changed, 13 insertions, 11 deletions

diff --git a/tests/codegen/asm/goto.rs b/tests/codegen/asm/goto.rs
index e522d0da5b4..0e69c4d5840 100644
--- a/tests/codegen/asm/goto.rs
+++ b/tests/codegen/asm/goto.rs
@@ -6,17 +6,6 @@
 
 use std::arch::asm;
 
-#[no_mangle]
-pub extern "C" fn panicky() {}
-
-struct Foo;
-
-impl Drop for Foo {
-    fn drop(&mut self) {
-        println!();
-    }
-}
-
 // CHECK-LABEL: @asm_goto
 #[no_mangle]
 pub unsafe fn asm_goto() {
@@ -38,6 +27,19 @@ pub unsafe fn asm_goto_with_outputs() -> u64 {
     out
 }
 
+// CHECK-LABEL: @asm_goto_with_outputs_use_in_label
+#[no_mangle]
+pub unsafe fn asm_goto_with_outputs_use_in_label() -> u64 {
+    let out: u64;
+    // CHECK: [[RES:%[0-9]+]] = callbr i64 asm sideeffect alignstack inteldialect "
+    // CHECK-NEXT: to label %[[FALLTHROUGHBB:[a-b0-9]+]] [label %[[JUMPBB:[a-b0-9]+]]]
+    asm!("{} /* {} */", out(reg) out, label { return out; });
+    // CHECK: [[JUMPBB]]:
+    // CHECK-NEXT: [[RET:%.+]] = phi i64 [ 1, %[[FALLTHROUGHBB]] ], [ [[RES]], %start ]
+    // CHECK-NEXT: ret i64 [[RET]]
+    1
+}
+
 // CHECK-LABEL: @asm_goto_noreturn
 #[no_mangle]
 pub unsafe fn asm_goto_noreturn() -> u64 {