1 files changed, 33 insertions, 0 deletions
diff --git a/tests/codegen-llvm/autodiff/scalar.rs b/tests/codegen-llvm/autodiff/scalar.rs
new file mode 100644
index 00000000000..096b4209e84
--- /dev/null
+++ b/tests/codegen-llvm/autodiff/scalar.rs
@@ -0,0 +1,33 @@
+//@ compile-flags: -Zautodiff=Enable -C opt-level=3  -Clto=fat
+//@ no-prefer-dynamic
+//@ needs-enzyme
+#![feature(autodiff)]
+
+use std::autodiff::autodiff_reverse;
+
+#[autodiff_reverse(d_square, Duplicated, Active)]
+#[no_mangle]
+fn square(x: &f64) -> f64 {
+    x * x
+}
+
+// CHECK:define internal fastcc double @diffesquare(double %x.0.val, ptr nocapture nonnull align 8 %"x'"
+// CHECK-NEXT:invertstart:
+// CHECK-NEXT:  %_0 = fmul double %x.0.val, %x.0.val
+// CHECK-NEXT:  %0 = fadd fast double %x.0.val, %x.0.val
+// CHECK-NEXT:  %1 = load double, ptr %"x'", align 8
+// CHECK-NEXT:  %2 = fadd fast double %1, %0
+// CHECK-NEXT:  store double %2, ptr %"x'", align 8
+// CHECK-NEXT:  ret double %_0
+// CHECK-NEXT:}
+
+fn main() {
+    let x = std::hint::black_box(3.0);
+    let output = square(&x);
+    assert_eq!(9.0, output);
+
+    let mut df_dx = 0.0;
+    let output_ = d_square(&x, &mut df_dx, 1.0);
+    assert_eq!(output, output_);
+    assert_eq!(6.0, df_dx);
+}