uint40

Victor Boctor

Hi, I need to implement uint40, where the compiler I am using (in an embedded environment) only supports up to uint32. It would be interesting to have a look at C++ implementations (or even C) for int40 or int64. The only one I found was the Putty C implementation of int64. Regards, Victor phpWebNotes is a page annotation system modelled after php.net. http://webnotes.sourceforge.net/demo.php[^]

Joaquin M Lopez Munoz

__int64 is a built-in type in VC++. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

MAAK

Am not sure if this might help, but it need a good Assembly programmer(I barely know it myself). This is how VC++ implement the __int64 using Assembly, remember that all processors register are 32 (except 64 bit CPU of course) and all operations are done on them at the processor level. Anyway these are C++ statements with corresponding Assembly, it you may be able to implement using Assembly.

	__int64 l1, l2, l3;
	l1 = 256;
00417053  mov         dword ptr [l1],100h 
0041705A  mov         dword ptr [ebp-14h],0 
	l2 = 128;
00417061  mov         dword ptr [l2],80h 
00417068  mov         dword ptr [ebp-24h],0 
	l3 = l1 + l2;
0041706F  mov         eax,dword ptr [l1] 
00417072  add         eax,dword ptr [l2] 
00417075  mov         ecx,dword ptr [ebp-14h] 
00417078  adc         ecx,dword ptr [ebp-24h] 
0041707B  mov         dword ptr [l3],eax 
0041707E  mov         dword ptr [ebp-34h],ecx 
	l3 = l1 - l2;
00417081  mov         eax,dword ptr [l1] 
00417084  sub         eax,dword ptr [l2] 
00417087  mov         ecx,dword ptr [ebp-14h] 
0041708A  sbb         ecx,dword ptr [ebp-24h] 
0041708D  mov         dword ptr [l3],eax 
00417090  mov         dword ptr [ebp-34h],ecx 
	l3 = l1 * l2;
00417093  mov         eax,dword ptr [ebp-24h] 
00417096  push        eax  
00417097  mov         ecx,dword ptr [l2] 
0041709A  push        ecx  
0041709B  mov         edx,dword ptr [ebp-14h] 
0041709E  push        edx  
0041709F  mov         eax,dword ptr [l1] 
004170A2  push        eax  
004170A3  call        @ILT+1330(__allmul) (411537h) 
004170A8  mov         dword ptr [l3],eax 
004170AB  mov         dword ptr [ebp-34h],edx 
	l3 = l1 / l2;
004170AE  mov         eax,dword ptr [ebp-24h] 
004170B1  push        eax  
004170B2  mov         ecx,dword ptr [l2] 
004170B5  push        ecx  
004170B6  mov         edx,dword ptr [ebp-14h] 
004170B9  push        edx  
004170BA  mov         eax,dword ptr [l1] 
004170BD  push        eax  
004170BE  call        @ILT+5340(__aulldiv) (4124E1h) 
004170C3  mov         dword ptr [l3],eax 
004170C6  mov         dword ptr [ebp-34h],edx 
	l3 = l1 % l2;
004170C9  mov         eax,dword ptr [ebp-24h] 
004170CC  push        eax  
004170CD  mov         ecx,dword ptr [l2] 
004170D0  push        ecx  
004170D1  mov         edx,dword ptr [ebp-14h] 
004170D4  push        edx  
004170D5  mov         eax,dword ptr [l1] 
004170D8  push        eax  
004170D9  call        @ILT+5345(__aullrem) (4124E6h) 
004170DE  mov         dword ptr [l3],eax 
004170E1