From 947b90adb821ab2a8b8dc12b45e0829623423f9e Mon Sep 17 00:00:00 2001
From: IlyaGredasov <iljagredasov@yandex.ru>
Date: Tue, 28 Apr 2026 10:23:15 +0300
Subject: [PATCH] fix: add intrinsics to header for clang-msvc compilation

---
 include/slimcpplib/long_math_msvc.h | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/include/slimcpplib/long_math_msvc.h b/include/slimcpplib/long_math_msvc.h
index a68615d..2172035 100644
--- a/include/slimcpplib/long_math_msvc.h
+++ b/include/slimcpplib/long_math_msvc.h
@@ -1,5 +1,4 @@
 ////////////////////////////////////////////////////////////////////////////////////////////////////
-//
 // Simple Long Integer Math for C++
 // version 1.3
 //
@@ -31,12 +30,20 @@
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
 #pragma once
-
 #include "long_math.h"
 
 #if defined(_MSC_VER)
-
-#include <intrin.h>
+    #include <immintrin.h>
+    #include <intrin.h>
+
+    #if defined(__clang__)
+        extern "C" {
+            unsigned char _addcarry_u8(unsigned char, unsigned char, unsigned char, unsigned char*);
+            unsigned char _addcarry_u16(unsigned char, unsigned short, unsigned short, unsigned short*);
+            unsigned char _subborrow_u8(unsigned char, unsigned char, unsigned char, unsigned char*);
+            unsigned char _subborrow_u16(unsigned char, unsigned short, unsigned short, unsigned short*);
+        }
+    #endif
 
 namespace slim
 {