Better exponent printing

See https://quick-bench.com/q/6y5x9YpVWDew62lDQa2SvEvJnuw
jk-jeon · Sep 2, 2024 · 81f7335 · 81f7335
1 parent 2fa4826
commit 81f7335
Showing 1 changed file with 4 additions and 6 deletions.
diff --git a/source/dragonbox_to_chars.cpp b/source/dragonbox_to_chars.cpp
@@ -522,12 +522,10 @@ namespace jkj {
  if (exponent >= 100) {
  // d1 = exponent / 10; d2 = exponent % 10;
  // 6554 = ceil(2^16 / 10)
- auto prod = stdr::uint_least32_t(exponent) * UINT32_C(6554);
- auto d1 = int(prod >> 16);
- prod = (prod & UINT16_C(0xffff)) * 5; // * 10
- auto d2 = int(prod >> 15); // >> 16
- print_2_digits(d1, buffer);
- print_1_digit(d2, buffer + 2);
+ auto d1 = (std::uint_least32_t(exponent) * UINT32_C(6554)) >> 16;
+ auto d2 = std::uint_least32_t(exponent) - UINT32_C(10) * d1;
+ print_2_digits(int(d1), buffer);
+ print_1_digit(int(d2), buffer + 2);
  buffer += 3;
  }
  else if (exponent >= 10) {