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)

doublen select (doublen a, doublen b, longn c) // if double extension enabled doublen select (doublen a, doublen b, ulongn c) // if double extension enabled
halfn select (halfn a, halfn b, shortn c) // if half extension enabled halfn select (halfn a, doublen b, ushortn c) // if half extension enabled

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.

Notes

The built-in relational functions can be used with built-in scalar or vector types as arguments and return a scalar vector integer result. The argment type gentype can be char, charn, uchar, ucharn, short, shortn, ushort, ushortn, int, intn, uint, uintn, long, longn, ulong, ulongn, float, and floatn. The argument type ugentype refers to unsigned integer vector types i.e. uchar, ucharn, ushort, ushortn, uint, uintn, ulong, and ulongn.

If extended with cl_khr_fp64, generic type name gentype may indicate double and double{2|4|8|16} as arguments and return values. If extended with cl_khr_fp16, generic type name gentype may indicate half and half{2|4|8|16} as arguments and return values.

Specification

OpenCL Specification

Also see

Relational Functions

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