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//@ compile-flags: -Zautodiff=Enable -C opt-level=3 -Clto=fat
//@ no-prefer-dynamic
//@ needs-enzyme
#![feature(autodiff)]
use std::autodiff::autodiff;
#[autodiff(d_square, Reverse, 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);
}
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