---
name: "vloadn"
section: "3clc"
platform: "linux"
package: "opencl-1.2-man-doc"
version: "1.0~svn33624-5.1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/vloadn"
---

# vloadn(3clc)

Read vectors from a pointer to memory.

## NAME

vloadn - Read vectors from a pointer to memory.

##

**gentypen vload*n*(size\_t** *offset***, const \_\_global gentype \****p***);**

**gentypen vload*n*(size\_t** *offset***, const \_\_local gentype \****p***);**

**gentypen vload*n*(size\_t** *offset***, const \_\_constant gentype \****p***);**

**gentypen vload*n*(size\_t** *offset***, const \_\_private gentype \****p***);**

## DESCRIPTION

Return sizeof (**gentype***n*) bytes of data read from address (*p* + (*offset* \* *n*)).

The address computed as (*p* + (*offset* \* *n*)) must be 8-bit aligned if **gentype** is **char** or **uchar**; 16-bit aligned if **gentype** is **short** or **ushort**; 32-bit aligned if **gentype** is **int**, **uint**, or **float**; 64-bit aligned if **gentype** is **long** or **ulong**.

If the **half** extension is enabled, the address computed as (*p* + (*offset* \* *n*)) must be 16-bit aligned.

## NOTES

Vector Data Load and Store Functions allow you to read and write vector types from a pointer to memory.

The generic type **gentype** is used to indicate the built-in data types **char**, **uchar**, **short**, **ushort**, **int**, **uint**, **long**, **ulong**, **float**, or **double**.

The generic type name **gentype***n* represents *n*-element vectors of **gentype** elements. The suffix *n* is also used in the function names (i.e. **vload***n*, **vstore***n*, etc.), where *n* = 2, 3, 4, 8, or 16.

The results of vector data load and store functions are undefined if the address being read from or written to is not correctly aligned. The pointer argument *p* can be a pointer to [**global**(3clc)](/global/3clc.md), [**local**(3clc)](/local/3clc.md), or [**private**(3clc)](/private/3clc.md) memory for store functions. The pointer argument *p* can be a pointer to \_\_global, \_\_local, [**constant**(3clc)](/constant/3clc.md) or \_\_private memory for load functions.

When extended by the [**cl\_khr\_fp16**(3clc)](/cl_khr_fp16/3clc.md) extension, the generic type **gentype***n* is extended to include **half**, **half2**, **half3**, **half4**, **half8**, and **half16**.

**vload3** and **vload\_half3** read *x*, *y*, *z* components from address (*p* + (*offset* \* 3)) into a 3-component vector.

## SPECIFICATION

**OpenCL Specification**\[1\]

## SEE ALSO

[**vectorDataLoadandStoreFunctions**(3clc)](/vectorDataLoadandStoreFunctions/3clc.md)

## AUTHORS

**The Khronos Group**

## COPYRIGHT

Copyright © 2007-2011 The Khronos Group Inc.\
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and/or associated documentation files (the "Materials"), to deal in the Materials without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Materials, and to permit persons to whom the Materials are furnished to do so, subject to the condition that this copyright notice and permission notice shall be included in all copies or substantial portions of the Materials.

## NOTES

- 1\.

  OpenCL Specification

  page 267, section 6.12.7 - Vector Data Load and Store Functions