1 files changed, 36 insertions, 0 deletions
diff --git a/tests/codegen-llvm/asm/critical.rs b/tests/codegen-llvm/asm/critical.rs
new file mode 100644
index 00000000000..0f29d7c69b4
--- /dev/null
+++ b/tests/codegen-llvm/asm/critical.rs
@@ -0,0 +1,36 @@
+//@ only-x86_64
+//@ compile-flags: -C no-prepopulate-passes
+#![feature(asm_goto_with_outputs)]
+#![crate_type = "lib"]
+use std::arch::asm;
+
+// Regression test for #137867. Check that critical edges have been split before code generation,
+// and so all stores to the asm output occur on disjoint paths without any of them jumping to
+// another callbr label.
+//
+// CHECK-LABEL: @f(
+// CHECK:        [[OUT:%.*]] = callbr i32 asm
+// CHECK-NEXT:   to label %[[BB0:.*]] [label %[[BB1:.*]], label %[[BB2:.*]]],
+// CHECK:       [[BB1]]:
+// CHECK-NEXT:    store i32 [[OUT]], ptr %a
+// CHECK-NEXT:    br label %[[BBR:.*]]
+// CHECK:       [[BB2]]:
+// CHECK-NEXT:    store i32 [[OUT]], ptr %a
+// CHECK-NEXT:    br label %[[BBR]]
+// CHECK:       [[BB0]]:
+// CHECK-NEXT:    store i32 [[OUT]], ptr %a
+// CHECK-NEXT:    br label %[[BBR]]
+// CHECK:       [[BBR]]:
+// CHECK-NEXT:    [[RET:%.*]] = load i32, ptr %a
+// CHECK-NEXT:    ret i32 [[RET]]
+#[unsafe(no_mangle)]
+pub unsafe fn f(mut a: u32) -> u32 {
+    asm!(
+        "jmp {}
+         jmp {}",
+        label {},
+        label {},
+        inout("eax") a,
+    );
+    a
+}