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since icx is based on LLVM technology and clang doesn't treat __m128 as a struct or union.
So code needs to be changed as t8.cpp
C:\temp>icl t9.cpp
Intel(R) C++ Intel(R) 64 Compiler Classic for applications running on Intel(R) 64, Version 2021.1 Beta Build 20200827
t9.cpp
Microsoft (R) Incremental Linker Version 14.28.29333.0
-out:t9.exe
t9.obj
C:\temp>t9.exe
C:\temp>icx t9.cpp
Intel(R) oneAPI DPC+/C+ Compiler Pro for applications running on Intel(R) 64, Version 2021.1 Beta Build 20200827
t9.cpp(11,8): error: member reference base type '__m128' (vector of 4 'float' values) is not a structure or union
V.m128_f32[i] = i + 1.5;
^~~~~~~~
t9.cpp(12,12): error: member reference base type '__m128' (vector of 4 'float' values) is not a structure or union
a = V.m128_f32[i];
^~~~~~~~
2 errors generated.
$ clang++ t9.cpp
t9.cpp:11:3: error: member reference base type '__m128' (vector of 4 'float' values) is not a structure or union
V.m128_f32[i] = i + 1.5;
~^~~~~~~~~
t9.cpp:12:7: error: member reference base type '__m128' (vector of 4 'float' values) is not a structure or union
a = V.m128_f32[i];
~^~~~~~~~~
2 errors generated.
C:\temp>icx t8.cpp
Intel(R) oneAPI DPC+/C+ Compiler Pro for applications running on Intel(R) 64, Version 2021.1 Beta Build 20200827
C:\temp>t8.exe
C:\temp> notepad t9.cpp
#include <immintrin.h>
#include <iostream>
using namespace std;
int main () {
float a;
__m128 V;
for (int i =0; i< 4; i ++)
V.m128_f32[i] = i + 1.5;
a = V.m128_f32[i];
cout << a << endl;
return 1 ;
C:\temp> notepad t8.cpp
#include <iostream>
#include <immintrin.h>
#include <vector>
using namespace std;
int main () {
__m128 a;
float b;
for (int i =0; i< 4; i ++)
a[i] = i +1.5;
b = a[i];
cout << b << endl;
return 0;
typedef __int8 Int8;
typedef __int16 Int16;
typedef __int32 Int32;
typedef __int64 Int64;
typedef unsigned __int8 UInt8;
typedef unsigned __int16 UInt16;
typedef unsigned __int32 UInt32;
typedef unsigned __int64 UInt64;
typedef char* String;
typedef float Single;
typedef double Double;
typedef bool Boolean;
struct Matrix3D
union
struct
Single M11, M12, M13, M14;
Single M21, M22, M23, M24;
Single M31, M32, M33, M34;
Single M44, M43, M42, M41;
__m128 Row[4];
float Arr[4][4];
__m256 _Row[4];
friend Matrix3D operator*(Matrix3D left, Matrix3D right)
Matrix3D Res = { 0 };
__m128 Dst;
for (Int32 i = 0; i < 4; i++)
for (Int32 j = 0; j < 4; j++)
Dst = _mm_mul_ps(left.Row[i], right.Row[j]);
Dst = _mm_hadd_ps(Dst, Dst);
Dst = _mm_hadd_ps(Dst, Dst);
Res.Arr[i][j] += Dst.m128_f32[0];
//result.Arr[i][j] += left.Arr[i][0] * right.Arr[0][j];
//result.Arr[i][j] += left.Arr[i][1] * right.Arr[1][j];
//result.Arr[i][j] += left.Arr[i][2] * right.Arr[2][j];
//result.Arr[i][j] += left.Arr[i][3] * right.Arr[3][j];
Res._Row[0] = _mm256_broadcast_ps(&Res.Row[0]);
Res._Row[1] = _mm256_broadcast_ps(&Res.Row[1]);
Res._Row[2] = _mm256_broadcast_ps(&Res.Row[2]);
Res._Row[3] = _mm256_broadcast_ps(&Res.Row[3]);
return (Res);
since icx is based on LLVM technology and clang doesn't treat __m128 as a struct or union.
So code needs to be changed as t8.cpp
C:\temp>icl t9.cpp
Intel(R) C++ Intel(R) 64 Compiler Classic for applications running on Intel(R) 64, Version 2021.1 Beta Build 20200827
t9.cpp
Microsoft (R) Incremental Linker Version 14.28.29333.0
-out:t9.exe
t9.obj
C:\temp>t9.exe
C:\temp>icx t9.cpp
Intel(R) oneAPI DPC+/C+ Compiler Pro for applications running on Intel(R) 64, Version 2021.1 Beta Build 20200827
t9.cpp(11,8): error: member reference base type '__m128' (vector of 4 'float' values) is not a structure or union
V.m128_f32[i] = i + 1.5;
^~~~~~~~
t9.cpp(12,12): error: member reference base type '__m128' (vector of 4 'float' values) is not a structure or union
a = V.m128_f32[i];
^~~~~~~~
2 errors generated.
$ clang++ t9.cpp
t9.cpp:11:3: error: member reference base type '__m128' (vector of 4 'float' values) is not a structure or union
V.m128_f32[i] = i + 1.5;
~^~~~~~~~~
t9.cpp:12:7: error: member reference base type '__m128' (vector of 4 'float' values) is not a structure or union
a = V.m128_f32[i];
~^~~~~~~~~
2 errors generated.
C:\temp>icx t8.cpp
Intel(R) oneAPI DPC+/C+ Compiler Pro for applications running on Intel(R) 64, Version 2021.1 Beta Build 20200827
C:\temp>t8.exe
C:\temp> notepad t9.cpp
#include <immintrin.h>
#include <iostream>
using namespace std;
int main () {
float a;
__m128 V;
for (int i =0; i< 4; i ++)
V.m128_f32[i] = i + 1.5;
a = V.m128_f32[i];
cout << a << endl;
return 1 ;
C:\temp> notepad t8.cpp
#include <iostream>
#include <immintrin.h>
#include <vector>
using namespace std;
int main () {
__m128 a;
float b;
for (int i =0; i< 4; i ++)
a[i] = i +1.5;
b = a[i];
cout << b << endl;
return 0;
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