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Microsoft Specific

Generates a store string instruction (rep stosq).

void __stosb( 
   unsigned __int64* Dest, 
   unsigned __int64 Data, 
   size_t Count 

[out] Dest

The destination of the operation.

[in] Data

The data to store.

[in] Count

The length of the block of quadwords to write.





Header file <intrin.h>

The result is that the quadword Data is written into a block of Count quadwords in the Dest string.

This routine is only available as an intrinsic.

// stosq.c
// processor: x64
#include <stdio.h>
#include <intrin.h>

#pragma intrinsic(__stosq)

int main()
   unsigned __int64 val = 0xFFFFFFFFFFFFI64;
   unsigned __int64 a[10];
   memset(a, 0, sizeof(a));
   __stosq(a+1, val, 2);
   printf("%I64x %I64x %I64x %I64x", a[0], a[1], a[2], a[3]); 

0 ffffffffffff ffffffffffff 0