adding f32 codegen test to autodiff

Signed-off-by: Karan Janthe <karanjanthe@gmail.com>

Author: KMJ-007

tests/codegen/autodiff/f32.rs

@@ -0,0 +1,35 @@
+//@ compile-flags: -Zautodiff=Enable -Zautodiff=NoPostopt -C opt-level=3 -Clto=fat -g
+//@ no-prefer-dynamic
+//@ needs-enzyme
+#![feature(autodiff)]
+
+use std::autodiff::autodiff_reverse;
+
+#[autodiff_reverse(d_square, Duplicated, Active)]
+#[no_mangle]
+fn callee(x: &f32) -> f32 {
+    *x * *x
+}
+
+fn main() {
+    let x: f32 = 7.0;
+    let mut df_dx: f32 = 0.0;
+    d_square(&x, &mut df_dx, 1.0);
+}
+
+// CHECK: define float @callee(ptr align 4 {{.*}}) {{.*}} !dbg {
+// CHECK-NEXT: start:
+// CHECK: #dbg_value
+// CHECK: load float
+// CHECK: fmul float
+// CHECK: ret float
+
+// CHECK: define void @_ZN9f32_debug8d_square{{.*}}(ptr align 4 {{.*}}, ptr align 4 {{.*}}, float {{.*}}) {{.*}} {
+// CHECK: call {{.*}} @diffecallee
+// CHECK: ret void
+
+// CHECK: define {{.*}} @diffecallee(ptr {{.*}} align 4 {{.*}}, ptr {{.*}} align 4 {{.*}}, float {{.*}}) {{.*}} {
+// CHECK: load float
+// CHECK: fmul float
+// CHECK: store float
+// CHECK: ret {{.*}}