From ee8d666a27f092f669b4df084837aec1ae683899 Mon Sep 17 00:00:00 2001
From: Matt Borland <matt@mattborland.com>
Date: Fri, 17 Feb 2023 09:06:53 -0800
Subject: [PATCH] Add intrinsics headers

---
 include/boost/charconv/detail/config.hpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/boost/charconv/detail/config.hpp b/include/boost/charconv/detail/config.hpp
index 62e3536..0991b03 100644
--- a/include/boost/charconv/detail/config.hpp
+++ b/include/boost/charconv/detail/config.hpp
@@ -64,6 +64,24 @@
 
 #endif // Determine endianness
 
+// Inclue intrinsics if available
+#if defined(_MSC_VER)
+#  include <intrin.h>
+#  if defined(_WIN64)
+#    define BOOST_CHARCONV_HAS_MSVC_64BIT_INTRINSICS
+#  else
+#    define BOOST_CHARCONV_HAS_MSVC_32BIT_INTRINSICS
+#  endif
+#elif (defined(__x86_64__) || defined(__i386__))
+#  include <x86intrin.h>
+#  define BOOST_CHARCONV_HAS_X86_INTRINSICS
+#elif defined(__ARM_NEON__)
+#  include <arm_neon.h>
+#  define BOOST_CHARCONV_HAS_ARM_INTRINSICS
+#else
+#  define BOOST_CHARCONV_HAS_NO_INTRINSICS
+#endif
+
 static_assert((BOOST_CHARCONV_ENDIAN_BIG_BYTE || BOOST_CHARCONV_ENDIAN_LITTLE_BYTE) &&
              !(BOOST_CHARCONV_ENDIAN_BIG_BYTE && BOOST_CHARCONV_ENDIAN_LITTLE_BYTE),
 "Inconsistent endianness detected. Please file an issue at https://github.com/cppalliance/charconv with your architecture");