From 667d0ed3c77f55cbda2082b034168d69898d1f88 Mon Sep 17 00:00:00 2001
From: Liqiang TAO <taolq@outlook.com>
Date: Wed, 19 Nov 2025 05:57:06 +0800
Subject: [PATCH] make code branchless (#2546)

---
 src/to_chars.cpp | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/src/to_chars.cpp b/src/to_chars.cpp
index ce71ff6cd..f140e1a19 100644
--- a/src/to_chars.cpp
+++ b/src/to_chars.cpp
@@ -814,20 +814,14 @@ void grisu2(char *buf, int &len, int &decimal_exponent, FloatType value) {
 */
 inline char *append_exponent(char *buf, int e) {
 
-  if (e < 0) {
-    e = -e;
-    *buf++ = '-';
-  } else {
-    *buf++ = '+';
-  }
+  bool isNegative = e < 0;
+  e = isNegative ? -e : e;
+  *buf++ = isNegative  ? '-' : '+';
 
   auto k = static_cast<std::uint32_t>(e);
-  if (k < 10) {
+  if (k < 100) {
     // Always print at least two digits in the exponent.
     // This is for compatibility with printf("%g").
-    *buf++ = '0';
-    *buf++ = static_cast<char>('0' + k);
-  } else if (k < 100) {
     *buf++ = static_cast<char>('0' + k / 10);
     k %= 10;
     *buf++ = static_cast<char>('0' + k);