From 25e448109dc68cd10b672ddc7f572810173d1abc Mon Sep 17 00:00:00 2001
From: HedgehogInTheCPP <a.rainman@gmail.com>
Date: Fri, 21 Aug 2026 17:59:34 +0300
Subject: [PATCH] constexpr fix for ancient standard.

---
 include/fast_float/float_common.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/fast_float/float_common.h b/include/fast_float/float_common.h
index f4d71d1..16d92d9 100644
--- a/include/fast_float/float_common.h
+++ b/include/fast_float/float_common.h
@@ -634,7 +634,7 @@ fastfloat_really_inline constexpr uint64_t emulu_generic(uint32_t x,
   return x * static_cast<uint64_t>(y);
 }
 
-fastfloat_really_inline constexpr uint64_t
+fastfloat_really_inline FASTFLOAT_CONSTEXPR14 uint64_t
 umul128_generic(uint64_t ab, uint64_t cd, uint64_t &hi) noexcept {
   auto ab_shifted = static_cast<uint32_t>(ab >> 32);
   auto cd_shifted = static_cast<uint32_t>(cd >> 32);
@@ -648,6 +648,7 @@ umul128_generic(uint64_t ab, uint64_t cd, uint64_t &hi) noexcept {
   hi = emulu_generic(ab_shifted, cd_shifted) +
        static_cast<uint32_t>(adbc >> 32) + adbc_carry +
        static_cast<uint64_t>(lo < bd);
+
   return lo;
 }