From bfbe4c486996ac2a7876b11d82f10493adb97a69 Mon Sep 17 00:00:00 2001
From: HedgehogInTheCPP <a.rainman@gmail.com>
Date: Tue, 18 Aug 2026 23:43:56 +0300
Subject: [PATCH] FASTFLOAT_HAS_SIMD -> FASTFLOAT_USE_SIMD

---
 README.md                         | 3 +++
 include/fast_float/ascii_number.h | 8 ++++----
 include/fast_float/float_common.h | 6 +++---
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/README.md b/README.md
index 0c1ab4a..296fabb 100644
--- a/README.md
+++ b/README.md
@@ -52,6 +52,9 @@ Introduced new optional macros to minimize overhead when certain parsing feature
   
 * **`FASTFLOAT_X86_SIMD`**
   Automatically uses reworking SSE parsing algorithms to improve performance on x86 machines.
+  
+* **`FASTFLOAT_USE_SIMD`**
+  Add possibility to completely disable manual algorithms realization and give compiler more freedom
 
 ---
 
diff --git a/include/fast_float/ascii_number.h b/include/fast_float/ascii_number.h
index f948928..acb654e 100644
--- a/include/fast_float/ascii_number.h
+++ b/include/fast_float/ascii_number.h
@@ -20,7 +20,7 @@ namespace fast_float {
 
 template <typename UC>
 fastfloat_really_inline constexpr bool has_simd_opt() noexcept {
-#ifdef FASTFLOAT_HAS_SIMD
+#ifdef FASTFLOAT_USE_SIMD
   return std::is_same<UC, char16_t>::value;
 #else
   return false;
@@ -79,7 +79,7 @@ read_chars_to_unsigned(UC const *chars) noexcept {
   return val;
 }
 
-#if FASTFLOAT_HAS_SIMD
+#if FASTFLOAT_USE_SIMD
 
 #if FASTFLOAT_X86_SIMD
 
@@ -181,7 +181,7 @@ parse_four_digits_unrolled(uint32_t val) noexcept {
   return (((val & 0x00FF00FF) * 0x00640001) >> 16) & 0xFFFF;
 }
 
-#if FASTFLOAT_HAS_SIMD
+#if FASTFLOAT_USE_SIMD
 
 #if FASTFLOAT_X86_SIMD
 
@@ -415,7 +415,7 @@ loop_parse_if_digits(UC const *&p, UC const *const pend, uint64_t &i) noexcept {
 fastfloat_really_inline FASTFLOAT_CONSTEXPR20 void
 loop_parse_if_digits(char const *&p, char const *const pend,
                      uint64_t &i) noexcept {
-#if FASTFLOAT_X86_SIMD >= 42 && FASTFLOAT_HAS_SIMD
+#if FASTFLOAT_X86_SIMD >= 42 && FASTFLOAT_USE_SIMD
   if (!is_constant_evaluated()) {
     /*
      * SSE4.2 handles 16 bytes at once.
diff --git a/include/fast_float/float_common.h b/include/fast_float/float_common.h
index c2c2866..eb42b4c 100644
--- a/include/fast_float/float_common.h
+++ b/include/fast_float/float_common.h
@@ -187,7 +187,7 @@ using parse_options = parse_options_t<char>;
 #endif
 #endif
 
-#ifdef FASTFLOAT_HAS_SIMD // user defined
+#ifdef FASTFLOAT_USE_SIMD // user defined
 #else
 #ifdef FASTFLOAT_X86_SIMD // user defined level
 static_assert(FASTFLOAT_X86_SIMD == 20 || FASTFLOAT_X86_SIMD == 42 ||
@@ -219,10 +219,10 @@ static_assert(FASTFLOAT_X86_SIMD == 20 || FASTFLOAT_X86_SIMD == 42 ||
 #endif
 
 #if defined(FASTFLOAT_X86_SIMD) || defined(FASTFLOAT_ARM_NEON)
-#define FASTFLOAT_HAS_SIMD 1
+#define FASTFLOAT_USE_SIMD 1
 #endif
 
-#if FASTFLOAT_HAS_SIMD
+#if FASTFLOAT_USE_SIMD
 #if defined(__GNUC__)
 // disable -Wcast-align=strict (GCC only)
 #define FASTFLOAT_SIMD_DISABLE_WARNINGS                                        \