Provided by: opencl-1.2-man-doc_1.0~svn22836-1.1_all

**NAME**

signbit - Test for sign bit.intsignbit(float);intnsignbit(floatn);intsignbit(double);longnsignbit(doublen);intsignbit(half) // if half extension enabledshortnsignbit(halfn) // if half extension enabled

**DESCRIPTION**

The built-in functionsignbittests for sign bit. The scalar version of the function returns a 1 if the sign bit in the float is set else returns 0. The vector version of the function returns the following for each component in floatn: -1 (i.e. all bits set) if the sign bit in the float is set else returns 0.

**NOTES**

If an implementation extends this specification to support IEEE-754 flags or exceptions, then all built-in relational functions shall proceed without raising theinvalidfloating-point exception when one or more of the operands are NaNs. The built-in relational functions are extended withcl_khr_fp16(3clc) to include appropriate versions of functions that takehalf, andhalf{2|3|4|8|16}as arguments and return values. The function returns a 0 if the specified relation isfalseand a 1 if the specified relation istruefor scalar argument types. These functions shall return a 0 if the specified relation isfalseand a - 1 (i.e. all bits set) if the specified relation istruefor vector argument types.

**SPECIFICATION**

OpenCLSpecification[1]

**SEE** **ALSO**

relationalFunctions(3clc)

**AUTHORS**

TheKhronosGroup

**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 264, section 6.12.6 - Relational Functions