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-rw-r--r--third_party/rust/ryu/src/pretty/exponent.rs48
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
+ }
+}