NAME
select − For each component of a vector type, result[i] = if MSB of c[i] is set ? b[i] : a[i]. For scalar type, result = c ? b : a.
gentype select(gentype a, gentype b, igentype c);gentype select(gentype a, gentype b, ugentype c);DESCRIPTION
For each component of a vector type, result[i] = if MSB of c[i] is set ? b[i] : a[i].
For scalar type, result = c ? b : a.
igentype and ugentype must have the same number of elements and bits as gentype.
NOTES
The argment type gentype can be char, charn,uchar, ucharn, short, shortn, ushort, ushortn, int, intn, uint, uintn, long, longn, ulong, ulongn, float, floatn, double, and doublen.
The argument type igentype refers to signed integer types, i.e. char, charn, short, shortn, int, intn, long, and longn.
The argument type ugentype refers to unsigned integer types, i.e. uchar, ucharn, ushort, ushortn, uint, uintn, ulong, and ulongn. n is 2, 3, 4, 8, or 16.
If an implementation extends this specification to support IEEE−754 flags or exceptions, then all built−in relational functions shall proceed without raising the invalid floating−point exception when one or more of the operands are NaNs.
The built−in relational functions are extended with cl_khr_fp16(3clc) to include appropriate versions of functions that take half, and half{2|3|4|8|16} as arguments and return values.
SPECIFICATION
OpenCL Specification [1]
SEE ALSO
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
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1. |
OpenCL Specification |
page 264, section 6.12.6 - Relational Functions