From 782b91da6747898e9d5dee6401227d57fc315235 Mon Sep 17 00:00:00 2001
From: Nikolay Puzanov <np@embddr.xyz>
Date: Thu, 30 Jan 2025 12:31:29 +0300
Subject: [PATCH] Speed up printing of ^2 base

---
 uprintf.c | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/uprintf.c b/uprintf.c
index 1f54ed1..ec67c5c 100644
--- a/uprintf.c
+++ b/uprintf.c
@@ -103,12 +103,36 @@ static void print_decimal(put_char_func pc, uint64_t u, int negative, unsigned i
     do {
         uint64_t l;
 
+        /* Speed up of special cases */
+        switch (base) {
+        case 2:
+            l = u & 1;
+            u >>= 1;
+            break;
+
+        case 4:
+            l = u & 3;
+            u >>= 2;
+            break;
+
+        case 8:
+            l = u & 7;
+            u >>= 3;
+            break;
+
+        case 16:
+            l = u & 15;
+            u >>= 4;
+            break;
+
+        default:
 #ifdef UPRINTF_CUSTOM_DIV_FUNC
-        u = idiv64_uu(u, (uint64_t)base, &l);
+            u = idiv64_uu(u, (uint64_t)base, &l);
 #else
-        l = u % base;
-        u = u / base;
+            l = u % base;
+            u = u / base;
 #endif
+        }
 
         s[si--] = abet[lcase][l];
     } while (u > 0);