diff --git a/include/fast_io_core_impl/intrinsics/carry.h b/include/fast_io_core_impl/intrinsics/carry.h
index 41cffbfe..918ea80a 100644
--- a/include/fast_io_core_impl/intrinsics/carry.h
+++ b/include/fast_io_core_impl/intrinsics/carry.h
@@ -26,7 +26,7 @@ inline constexpr T addc(T a, T b, bool carryin, bool &carryout) noexcept
 	if (!__builtin_is_constant_evaluated())
 #endif
 	{
-#if defined(_MSC_VER) && !defined(__clang__) && (defined(_M_IX86) || defined(_M_AMD64))
+#if defined(_MSC_VER) && !defined(__clang__) && (defined(_M_IX86) || defined(_M_AMD64)) && !defined(__arm64ec__) && !defined(_M_ARM64EC)
 #if !__has_cpp_attribute(assume)
 		__assume(carryin == 0 || carryin == 1);
 #endif
@@ -104,7 +104,7 @@ inline constexpr T subc(T a, T b, bool carryin, bool &carryout) noexcept
 	if (!__builtin_is_constant_evaluated())
 #endif
 	{
-#if defined(_MSC_VER) && !defined(__clang__) && (defined(_M_IX86) || defined(_M_AMD64))
+#if defined(_MSC_VER) && !defined(__clang__) && (defined(_M_IX86) || defined(_M_AMD64)) && !defined(__arm64ec__) && !defined(_M_ARM64EC)
 #if !__has_cpp_attribute(assume)
 		__assume(carryin == 0 || carryin == 1);
 #endif
diff --git a/include/fast_io_core_impl/intrinsics/msvc/impl.h b/include/fast_io_core_impl/intrinsics/msvc/impl.h
index 1e073419..1f0ce5a9 100644
--- a/include/fast_io_core_impl/intrinsics/msvc/impl.h
+++ b/include/fast_io_core_impl/intrinsics/msvc/impl.h
@@ -1,7 +1,9 @@
 #pragma once
 
 #if defined(_MSC_VER) && !defined(__clang__)
+#if !defined(_M_ARM64EC)
 #include "x86.h"
+#endif
 #include "arm.h"
 #include "common.h"
 #endif
diff --git a/include/fast_io_core_impl/intrinsics/udivmod.h b/include/fast_io_core_impl/intrinsics/udivmod.h
index 20df39da..fb1632c6 100644
--- a/include/fast_io_core_impl/intrinsics/udivmod.h
+++ b/include/fast_io_core_impl/intrinsics/udivmod.h
@@ -26,7 +26,7 @@ Referenced from
 template <typename T>
 inline constexpr tuint<T> udivbigbysmalltosmalldefault(T u1, T u0, T v) noexcept
 {
-#if (defined(__x86_64__) || defined(_M_AMD64)) && !defined(__arm64ec__)
+#if (defined(__x86_64__) || defined(_M_AMD64)) && !defined(__arm64ec__) && !defined(_M_ARM64EC)
 	if constexpr (sizeof(T) == sizeof(::std::uint_least64_t))
 	{
 #if defined(__cpp_if_consteval)
@@ -112,7 +112,7 @@ inline constexpr tuint<T> udivbigbysmalltosmalldefault(T u1, T u0, T v) noexcept
 template <typename T>
 inline constexpr T shiftleft(T low, T high, unsigned shift) noexcept
 {
-#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_AMD64)
+#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_AMD64) && !defined(__arm64ec__) && !defined(_M_ARM64EC)
 	if constexpr (sizeof(T) == sizeof(long long unsigned))
 	{
 #if defined(__cpp_if_consteval)
@@ -137,7 +137,7 @@ inline constexpr T shiftleft(T low, T high, unsigned shift) noexcept
 template <typename T>
 inline constexpr T shiftright(T low, T high, unsigned shift) noexcept
 {
-#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_AMD64)
+#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_AMD64) && !defined(__arm64ec__) && !defined(_M_ARM64EC)
 	if constexpr (sizeof(T) == sizeof(long long unsigned))
 	{
 #if defined(__cpp_if_consteval)
diff --git a/include/fast_io_core_impl/intrinsics/umul.h b/include/fast_io_core_impl/intrinsics/umul.h
index 36917883..35840e76 100644
--- a/include/fast_io_core_impl/intrinsics/umul.h
+++ b/include/fast_io_core_impl/intrinsics/umul.h
@@ -418,7 +418,7 @@ inline constexpr T umul(U a, T b, U &high) noexcept
 				return static_cast<T>(res);
 			}
 		}
-#elif defined(_MSC_VER) && defined(_M_X64)
+#elif defined(_MSC_VER) && defined(_M_X64) && !defined(__arm64ec__) && !defined(_M_ARM64EC)
 #if defined(__cpp_lib_is_constant_evaluated) || defined(__cpp_if_consteval)
 #if defined(__cpp_if_consteval)
 		if consteval
@@ -526,7 +526,7 @@ inline constexpr U umulh(U a, T b) noexcept
 				return static_cast<U>(res >> 64u);
 			}
 		}
-#elif defined(_MSC_VER) && defined(_M_X64)
+#elif defined(_MSC_VER) && defined(_M_X64) && !defined(__arm64ec__) && !defined(_M_ARM64EC)
 #if defined(__cpp_lib_is_constant_evaluated) || defined(__cpp_if_consteval)
 #if defined(__cpp_if_consteval)
 		if consteval