Visual Studio 2008 has supports “Enable Instruction Functions” options (see a project settings -> C/C++ -> Optimization). Note that this option can enlarge code.
Also memcpy function implementation has written with using sse2 (movdqa).
int CopyMemSSE4(int* piDst, int* piSrc, unsigned long SizeInBytes)
{
// Initialize pointers to start of the USWC memory
_asm
{
mov esi, piSrc
mov edx, piSrc
// Initialize pointer to end of the USWC memory
add edx, SizeInBytes
// Initialize pointer to start of the cacheable WB buffer
mov edi, piDst
// Start of Bulk Load loop
inner_start:
// Load data from USWC Memory using Streaming Load
MOVNTDQA xmm0, xmmword ptr [esi]
MOVNTDQA xmm1, xmmword ptr [esi+16]
MOVNTDQA xmm2, xmmword ptr [esi+32]
MOVNTDQA xmm3, xmmword ptr [esi+48]
// Copy data to buffer
MOVDQA xmmword ptr [edi], xmm0
MOVDQA xmmword ptr [edi+16], xmm1
MOVDQA xmmword ptr [edi+32], xmm2
MOVDQA xmmword ptr [edi+48], xmm3
// Increment pointers by cache line size and test for end of loop
add esi, 040h
add edi, 040h
cmp esi, edx
jne inner_start
}
// End of Bulk Load loop
return 0;
}
#define DATA_SIZE 0x01000000
int main(int argc, char* argv[])
{
int *piSrc = NULL;
int *piDst = NULL;
unsigned long dwDataSizeInBytes = sizeof(int) * DATA_SIZE;
piSrc = (int *)_aligned_malloc(dwDataSizeInBytes, dwDataSizeInBytes);
piDst = (int *)_aligned_malloc(dwDataSizeInBytes, dwDataSizeInBytes);
memset(piSrc, 255, dwDataSizeInBytes);
memset(piDst, 0, dwDataSizeInBytes);
CopyMemSSE4(piDst, piSrc, dwDataSizeInBytes);
_aligned_free(piSrc);
_aligned_free(piDst);
}
The CheckTokenMembership function determines whether a specified security identifier (SID) is enabled in an access token.
/*
Routine Description: This routine returns TRUE if the caller's
process is a member of the Administrators local group. Caller is NOT
expected to be impersonating anyone and is expected to be able to
open its own process and process token.
Arguments: None.
Return Value:
TRUE - Caller has Administrators local group.
FALSE - Caller does not have Administrators local group.
*/
BOOL IsUserAdmin(void)
{
BOOL bResult;
SID_IDENTIFIER_AUTHORITY NtAuthority = SECURITY_NT_AUTHORITY;
PSID AdministratorsGroup;
bResult = AllocateAndInitializeSid(&NtAuthority, 2, SECURITY_BUILTIN_DOMAIN_RID,
DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0,
&AdministratorsGroup);
if(bResult)
{
if(!CheckTokenMembership(NULL, AdministratorsGroup, &bResult))
{
bResult = FALSE;
}
FreeSid(AdministratorsGroup);
}
return(bResult);
}
stdint.h is a header file in the C standard library introduced in the C99 standard library section 7.18 to allow programmers to write more portable code by providing a set of typedefs that specify exact-width integer types, together with the defined minimum and maximum allowable values for each type, using macros. This header is particularly useful for embedded programming which often involves considerable manipulation of hardware specific I/O registers requiring integer data of fixed widths, specific locations and exact alignments. stdint.h (for C), and stdint.h and cstdint (for C++).
stdint.h defines:
int8_t
int16_t
int32_t
uint8_t
uint16_t
uint32_t
stdint.h is not shipped with older C++ compilers and Visual Studio C++ products prior to Visual Studio 2010.
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BigBlueButton is an active open source project that focuses on usability, modularity, and clean design — both for the user and the developer. The project is hosted at Google Code.
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