1 files changed, 60 insertions, 0 deletions
diff --git a/third_party/rust/packed_simd/src/api/fmt/debug.rs b/third_party/rust/packed_simd/src/api/fmt/debug.rs
new file mode 100644
index 0000000000..1e209b3bff
--- /dev/null
+++ b/third_party/rust/packed_simd/src/api/fmt/debug.rs
@@ -0,0 +1,60 @@
+//! Implement debug formatting
+
+macro_rules! impl_fmt_debug_tests {
+    ([$elem_ty:ty; $elem_count:expr]: $id:ident | $test_tt:tt) => {
+        test_if! {
+            $test_tt:
+            paste::item! {
+                pub mod [<$id _fmt_debug>] {
+                    use super::*;
+                    #[cfg_attr(not(target_arch = "wasm32"), test)]
+                    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+                    fn debug() {
+                        use arrayvec::{ArrayString,ArrayVec};
+                        type TinyString = ArrayString<[u8; 512]>;
+
+                        use crate::fmt::Write;
+                        let v = $id::default();
+                        let mut s = TinyString::new();
+                        write!(&mut s, "{:?}", v).unwrap();
+
+                        let mut beg = TinyString::new();
+                        write!(&mut beg, "{}(", stringify!($id)).unwrap();
+                        assert!(s.starts_with(beg.as_str()));
+                        assert!(s.ends_with(")"));
+                        let s: ArrayVec<[TinyString; 64]>
+                            = s.replace(beg.as_str(), "")
+                            .replace(")", "").split(",")
+                            .map(|v| TinyString::from(v.trim()).unwrap())
+                            .collect();
+                        assert_eq!(s.len(), $id::lanes());
+                        for (index, ss) in s.into_iter().enumerate() {
+                            let mut e = TinyString::new();
+                            write!(&mut e, "{:?}", v.extract(index)).unwrap();
+                            assert_eq!(ss, e);
+                        }
+                    }
+                }
+            }
+        }
+    };
+}
+
+macro_rules! impl_fmt_debug {
+    ([$elem_ty:ty; $elem_count:expr]: $id:ident | $test_tt:tt) => {
+        impl crate::fmt::Debug for $id {
+            #[allow(clippy::missing_inline_in_public_items)]
+            fn fmt(&self, f: &mut crate::fmt::Formatter<'_>) -> crate::fmt::Result {
+                write!(f, "{}(", stringify!($id))?;
+                for i in 0..$elem_count {
+                    if i > 0 {
+                        write!(f, ", ")?;
+                    }
+                    self.extract(i).fmt(f)?;
+                }
+                write!(f, ")")
+            }
+        }
+        impl_fmt_debug_tests!([$elem_ty; $elem_count]: $id | $test_tt);
+    };
+}