Use permute_ps to swap real and imag

code/matrix_multiplication.h

@@ -127,8 +127,8 @@ void matrixMultiplyAVX2b(const std::complex<float>* a,
 
   __m256 b_1 = _mm256_permutevar8x32_ps(b_m, _mm256_set_epi32(3, 2, 1, 0, 3, 2, 1, 0));
   __m256 b_2 = _mm256_permutevar8x32_ps(b_m, _mm256_set_epi32(7, 6, 5, 4, 7, 6, 5, 4));
-  __m256 b_3 = _mm256_permutevar8x32_ps(b_m, _mm256_set_epi32(2, 3, 0, 1, 2, 3, 0, 1));
-  __m256 b_4 = _mm256_permutevar8x32_ps(b_m, _mm256_set_epi32(6, 7, 4, 5, 6, 7, 4, 5));
+  __m256 b_3 = _mm256_permute_ps(b_1, _MM_SHUFFLE(2, 3, 0, 1));
+  __m256 b_4 = _mm256_permute_ps(b_2, _MM_SHUFFLE(2, 3, 0, 1));
 
   __m256 c_m = _mm256_mul_ps(a_1, b_1);
   c_m = _mm256_fmadd_ps(a_2, b_2, c_m);