1 files changed, 50 insertions, 0 deletions
diff --git a/third_party/rust/rust_decimal/benches/comparison.rs b/third_party/rust/rust_decimal/benches/comparison.rs
new file mode 100644
index 0000000000..d6bf29adba
--- /dev/null
+++ b/third_party/rust/rust_decimal/benches/comparison.rs
@@ -0,0 +1,50 @@
+//! See how `rust-decimal` performs compared to native floating numbers.
+
+use criterion::{
+    black_box, criterion_group, criterion_main, measurement::Measurement, BenchmarkGroup, BenchmarkId, Criterion,
+};
+use rust_decimal::Decimal;
+
+const DECIMAL_2_01: Decimal = Decimal::from_parts(201, 0, 0, false, 2);
+const DECIMAL_13_7: Decimal = Decimal::from_parts(137, 0, 0, false, 1);
+const F64_2_01: f64 = 2.01;
+const F64_13_7: f64 = 13.7;
+
+macro_rules! add_benchmark_group {
+    ($criterion:expr, $f:ident, $op:tt) => {
+        fn $f<M, const N: usize>(group: &mut BenchmarkGroup<'_, M>)
+        where
+            M: Measurement,
+        {
+            group.bench_with_input(BenchmarkId::new("f64 (diff)", N), &N, |ben, _| {
+                ben.iter(|| black_box(F64_2_01 $op F64_13_7))
+            });
+
+            group.bench_with_input(BenchmarkId::new("f64 (equal)", N), &N, |ben, _| {
+                ben.iter(|| black_box(F64_2_01 $op F64_2_01))
+            });
+
+            group.bench_with_input(BenchmarkId::new("rust-decimal (diff)", N), &N, |ben, _| {
+                ben.iter(|| black_box(DECIMAL_2_01 $op DECIMAL_13_7))
+            });
+
+            group.bench_with_input(BenchmarkId::new("rust-decimal (equal)", N), &N, |ben, _| {
+                ben.iter(|| black_box(DECIMAL_2_01 $op DECIMAL_2_01))
+            });
+        }
+
+        let mut group = $criterion.benchmark_group(stringify!($f));
+        $f::<_, 100>(&mut group);
+        group.finish();
+    };
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+    add_benchmark_group!(c, addition, +);
+    add_benchmark_group!(c, division, /);
+    add_benchmark_group!(c, multiplication, *);
+    add_benchmark_group!(c, subtraction, -);
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);