stosq.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: __stosq	__stosq	09/02/2019	__stosq	rep stosq instruction stosq instruction __stosq intrinsic	3ea28297-4369-4c2d-bf0c-91fa539ce209

__stosq

Microsoft Specific

Generates a store string instruction (rep stosq).

Syntax

void __stosq(
   unsigned __int64* Destination,
   unsigned __int64 Data,
   size_t Count
);

Parameters

Destination
[out] The destination of the operation.

Data
[in] The data to store.

Count
[in] The length of the block of quadwords to write.

Requirements

Intrinsic	Architecture
__stosq	AMD64

Header file <intrin.h>

Remarks

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

This routine is only available as an intrinsic.

Example

// 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

END Microsoft Specific

See also

Compiler intrinsics