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34 lines
954 B
Rust
34 lines
954 B
Rust
//@ compile-flags: -Zautodiff=Enable -C opt-level=3 -Clto=fat
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//@ no-prefer-dynamic
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//@ needs-enzyme
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#![feature(autodiff)]
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use std::autodiff::autodiff_reverse;
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#[autodiff_reverse(d_square, Duplicated, Active)]
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#[no_mangle]
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fn square(x: &f64) -> f64 {
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x * x
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}
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// CHECK:define internal fastcc double @diffesquare(double %x.0.val, ptr nocapture nonnull align 8 %"x'"
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// CHECK-NEXT:invertstart:
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// CHECK-NEXT: %_0 = fmul double %x.0.val, %x.0.val
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// CHECK-NEXT: %0 = fadd fast double %x.0.val, %x.0.val
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// CHECK-NEXT: %1 = load double, ptr %"x'", align 8
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// CHECK-NEXT: %2 = fadd fast double %1, %0
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// CHECK-NEXT: store double %2, ptr %"x'", align 8
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// CHECK-NEXT: ret double %_0
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// CHECK-NEXT:}
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fn main() {
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let x = std::hint::black_box(3.0);
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let output = square(&x);
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assert_eq!(9.0, output);
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let mut df_dx = 0.0;
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let output_ = d_square(&x, &mut df_dx, 1.0);
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assert_eq!(output, output_);
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assert_eq!(6.0, df_dx);
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}
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