From b6df805a12d857da7f7d4b46c53348b5c828af0c Mon Sep 17 00:00:00 2001
From: Borislav Stanimirov <b.stanimirov@abv.bg>
Date: Thu, 4 Feb 2021 14:34:59 +0200
Subject: [PATCH] <charconv>: small optimization of _Integer_to_chars for bases
 3,6,5,7,9

---
 stl/inc/charconv | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/stl/inc/charconv b/stl/inc/charconv
index 20d8342c41b..9ab5d01ec81 100644
--- a/stl/inc/charconv
+++ b/stl/inc/charconv
@@ -127,6 +127,17 @@ _NODISCARD to_chars_result _Integer_to_chars(
         } while (_Value != 0);
         break;
 
+    case 3:
+    case 5:
+    case 6:
+    case 7:
+    case 9:
+        do {
+            *--_RNext = static_cast<char>('0' + _Value % _Base);
+            _Value    = static_cast<_Unsigned>(_Value / _Base);
+        } while (_Value != 0);
+        break;
+
     default:
         do {
             *--_RNext = _Charconv_digits[_Value % _Base];