clamp(3clc) 
Clamp x to range given by min, max

degrees(3clc) 
radians to degrees

commonMax(3clc) 
Maximum of x and y

commonMin(3clc) 
Minimum of x and y

mix(3clc) 
Linear blend of x and y

radians(3clc) 
degrees to radians

sign(3clc) 
Sign of x

smoothstep(3clc) 
Step and interpolate

step(3clc) 
0.0 if x < edge, else 1.0

SPECIFICATION
m[blue]OpenCL Specificationm[][1]
AUTHORS
The Khronos Group
COPYRIGHT
Copyright © 20072011 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 260, section 6.12.4  Common Functions