1 files changed, 48 insertions, 0 deletions
diff --git a/third_party/rust/ryu/src/pretty/exponent.rs b/third_party/rust/ryu/src/pretty/exponent.rs
new file mode 100644
index 0000000000..b72add5e82
--- /dev/null
+++ b/third_party/rust/ryu/src/pretty/exponent.rs
@@ -0,0 +1,48 @@
+use crate::digit_table::*;
+use core::ptr;
+
+#[cfg_attr(feature = "no-panic", inline)]
+pub unsafe fn write_exponent3(mut k: isize, mut result: *mut u8) -> usize {
+    let sign = k < 0;
+    if sign {
+        *result = b'-';
+        result = result.offset(1);
+        k = -k;
+    }
+
+    debug_assert!(k < 1000);
+    if k >= 100 {
+        *result = b'0' + (k / 100) as u8;
+        k %= 100;
+        let d = DIGIT_TABLE.as_ptr().offset(k * 2);
+        ptr::copy_nonoverlapping(d, result.offset(1), 2);
+        sign as usize + 3
+    } else if k >= 10 {
+        let d = DIGIT_TABLE.as_ptr().offset(k * 2);
+        ptr::copy_nonoverlapping(d, result, 2);
+        sign as usize + 2
+    } else {
+        *result = b'0' + k as u8;
+        sign as usize + 1
+    }
+}
+
+#[cfg_attr(feature = "no-panic", inline)]
+pub unsafe fn write_exponent2(mut k: isize, mut result: *mut u8) -> usize {
+    let sign = k < 0;
+    if sign {
+        *result = b'-';
+        result = result.offset(1);
+        k = -k;
+    }
+
+    debug_assert!(k < 100);
+    if k >= 10 {
+        let d = DIGIT_TABLE.as_ptr().offset(k * 2);
+        ptr::copy_nonoverlapping(d, result, 2);
+        sign as usize + 2
+    } else {
+        *result = b'0' + k as u8;
+        sign as usize + 1
+    }
+}