This one jumped up and bit me once I started using large amounts of memory. As soon as the algo ran the app dropped dead. In its original form I had used EAX rather than RAX as the register to hold the address, changed it after tracking down where the crash occurred and its reliable with software using the /LARGEADDRESSAWARE linker option.
I have attached a single asm library module to replace it. Unzip the file, overwrite the one in the current library with the new one and run "makeit.bat" and all should be well.
This is the module.
; ¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤
include \masm32\include64\masm64rt.inc
.code
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Get_Vendor proc pBuffer:QWORD
; -----------------------------------------------
; pBuffer needs to be at least 16 bytes in length
; -----------------------------------------------
LOCAL .ebx :DWORD
mov .ebx, ebx
mov eax, 0 ; set ID string for Intel
cpuid
mov rax, pBuffer ; (pBuffer) load buffer address into RAX
mov [rax], ebx ; write results to buffer
mov [rax+4], edx
mov [rax+8], ecx
mov BYTE PTR [rax+12], 0
mov ebx, .ebx
ret
Get_Vendor endp
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end