diff --git a/CMakeLists.txt b/CMakeLists.txt
index 85750f45302..595d90c8513 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -475,10 +475,8 @@ else()
         check_cxx_source_compiles("#include <immintrin.h>\nint main() { __m256 _s, _a, _b; _s = _mm256_fmadd_ps(_a, _b, _s); return 0; }" NCNN_COMPILER_SUPPORT_X86_FMA)
 
         set(CMAKE_REQUIRED_FLAGS "/arch:AVX -mxop")
-        check_cxx_source_compiles("#include <ammintrin.h>\nint main() { __m128 _s, _a, _b; _s = _mm_maddd_epi16(_a, _b, _s); return 0; }" NCNN_COMPILER_SUPPORT_X86_XOP_0)
-        check_cxx_source_compiles("#include <x86intrin.h>\nint main() { __m128 _s, _a, _b; _s = _mm_maddd_epi16(_a, _b, _s); return 0; }" NCNN_COMPILER_SUPPORT_X86_XOP_1)
+        check_cxx_source_compiles("#include <x86intrin.h>\nint main() { __m128 _s, _a, _b; _s = _mm_maddd_epi16(_a, _b, _s); return 0; }" NCNN_COMPILER_SUPPORT_X86_XOP)
 
-        check_cxx_compiler_flag("/arch:AVX -mxop" NCNN_COMPILER_SUPPORT_X86_XOP)
         check_cxx_compiler_flag("/arch:AVX -mf16c" NCNN_COMPILER_SUPPORT_X86_F16C)
         check_cxx_compiler_flag("/arch:AVX2 -mfma -mf16c" NCNN_COMPILER_SUPPORT_X86_AVX2)
         check_cxx_compiler_flag("/arch:AVX512 -mfma -mf16c -mavx512cd -mavx512bw -mavx512dq -mavx512vl" NCNN_COMPILER_SUPPORT_X86_AVX512)
diff --git a/src/layer/x86/x86_usability.h b/src/layer/x86/x86_usability.h
index c838eb0c723..033d37b1428 100644
--- a/src/layer/x86/x86_usability.h
+++ b/src/layer/x86/x86_usability.h
@@ -25,7 +25,7 @@
 #if __AVX__
 #include <immintrin.h>
 #if __XOP__
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(__clang__)
 #include <ammintrin.h>
 #else
 #include <x86intrin.h>