1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
//@ 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]
#[inline(never)]
fn square(x: &f64) -> f64 {
x * x
}
// CHECK:define internal fastcc double @diffesquare(double %x.0.val, ptr nonnull align 8 captures(none) %"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);
}
|
