SSE2 _mm_slli_si128 décalage non effectué

DWORD WINAPI WaitFunction(LPVOID lParam)
{
        MSG msg;
	HANDLE *hEvent = (HANDLE*)lParam;				//To alert the main thread the end of the process
	PeekMessage(&msg,0,0,0,PM_NOREMOVE);		//To create the message queue
	SetEvent(*hEvent);
		
	while (GetMessage(&msg, NULL, 0, 0))		//Wait for message
	{	
		int type  = HIWORD(msg.wParam);
		int which = LOWORD(msg.wParam);
		switch(which)
		{
		
		case MT_STRETCH_HIST:
			if(type==dtUINT8) {Intensity::_StretchHistogramMT<UINT8,UINT8>  ((LPVOID)msg.lParam);break;}
			if(type==dtUINT16){Intensity::_StretchHistogramMT<UINT16,UINT16>((LPVOID)msg.lParam);break;}
...
...

bool MultiThreading::Start(int which,const char *szType,int nbThread)
{
	unsigned int type=100;
	if(strcmp(szType,"unsigned char")==0) type=dtUINT8;
	if(strcmp(szType,"unsigned short int")==0) type=dtUINT16;
	if(strcmp(szType,"unsigned int")==0) type=dtUINT32;
	if(strcmp(szType,"int")==0) type=dtINT32;
	if(strcmp(szType,"float")==0) type=dtFLOAT;
	if(strcmp(szType,"double")==0) type=dtDOUBLE;
	if(strcmp(szType,"unsigned char float")==0) type=dtDOUBLE+1;
	if(strcmp(szType,"unsigned char double")==0) type=dtDOUBLE+2;
	if(type==100)return 0;

			
	for(int i=0;i<nbThread;i++)				PostThreadMessage(idThread[i],0,MAKELONG(which,type),(LPARAM)Param);
			   
        WaitForMultipleObjects(nbThread,hEvents,1,INFINITE);
        return 1;
}