Microsoft Specific

Generates a Move String (rep movsb) instruction.

void __movsb(
   unsigned char* Destination,
   unsigned const char* Source,
   size_t Count
);

Destination
[out] A pointer to the destination of the copy.

Source
[in] A pointer to the source of the copy.

Count
[in] The number of bytes to copy.

Header file <intrin.h>

The result is that the first Count bytes pointed to by Source are copied to the Destination string.

This routine is only available as an intrinsic.

// movsb.cpp
// processor: x86, x64
#include <stdio.h>
#include <intrin.h>

#pragma intrinsic(__movsb)

int main()
{
    unsigned char s1[100];
    unsigned char s2[100] = "A big black dog.";
    __movsb(s1, s2, 100);

    printf_s("%s %s", s1, s2);
}

A big black dog. A big black dog.

END Microsoft Specific

Compiler intrinsics