Auto merge of #116301 - mj10021:issue-115737-fix, r=cuviper

fix rounding issue with exponents in fmt

fixes issue #115737 , where the decimal places are rounded incorrectly when formatting scientific notation

library/core/src/fmt/num.rs

@@ -309,7 +309,6 @@ macro_rules! impl_Exp {
                     n /= 10;
                     exponent += 1;
                 }
-
                 let (added_precision, subtracted_precision) = match f.precision() {
                     Some(fmt_prec) => {
                         // number of decimal digits minus 1
@@ -331,9 +330,15 @@ macro_rules! impl_Exp {
                     let rem = n % 10;
                     n /= 10;
                     exponent += 1;
-                    // round up last digit
-                    if rem >= 5 {
+                    // round up last digit, round to even on a tie
+                    if rem > 5 || (rem == 5 && (n % 2 != 0 || subtracted_precision > 1 )) {
                         n += 1;
+                        // if the digit is rounded to the next power
+                        // instead adjust the exponent
+                        if n.ilog10() > (n - 1).ilog10() {
+                            n /= 10;
+                            exponent += 1;
+                        }
                     }
                 }
                 (n, exponent, exponent, added_precision)

library/core/tests/fmt/num.rs

@@ -150,6 +150,18 @@ fn test_format_int_exp_precision() {
 
     // test padding with precision (and sign)
     assert_eq!(format!("{:+10.3e}", 1), "  +1.000e0");
+
+    // test precision remains correct when rounding to next power
+
+    for i in i16::MIN..=i16::MAX {
+        for p in 0..=5 {
+            assert_eq!(
+                format!("{i:.p$e}"),
+                format!("{:.p$e}", f32::from(i)),
+                "integer {i} at precision {p}"
+            );
+        }
+    }
 }
 
 #[test]