gentypen
vloadn
(
| size_t offset , |
const __constant gentype *p
) |
Description
Return sizeof (gentypen) 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 gentypen
represents n-element vectors of gentype
elements. The suffix n is also used in the
function names (i.e. vload,
nvstore, etc.), where
nn = 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,
__local, or
__private
memory for store functions. The pointer argument
p can be a pointer to __global, __local, __constant or __private
memory for load functions.
When extended by the
cl_khr_fp16 extension,
the generic type gentypen 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.
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.