float
| size_t offset, |
const __constant half *p) |
Description
For n = 1, 2, 4, 8 and 16 read sizeof(halfn) bytes
of data from address (p + (offset
* n)). The data read is interpreted as
a halfn value. The
halfn value read is converted
to a floatn value and the
floatn value is returned.
The address computed as (p +
(offset * n)) must be aligned to
sizeof(halfn) bytes.
For n = 3, vloada_half3 reads a
half3 from address (p + (offset *
4)) and returns a float3. The address computed as (p +
(offset * 4)) must be aligned to sizeof (half) * 4 bytes.
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.
In addition vloada_half3 reads x,
y, z components from address
(p + (offset * 4)) into a 3- component vector.
Copyright © 2007-2011 The Khronos Group Inc.
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