Speed of cos() and sin() function in GLSL shaders?

Question

I\'m interested in information about the speed of sin() and cos() in Open GL Shader Language.

The GLSL Specification Document indi

Answer 1

Not sure if this answers your question, but it's very difficult to tell you how many clocks/slots an instruction takes as it depends very much on the GPU. Usually it's a single cycle. But even if not, the compiler may rearrange the order of instruction execution to hide the true cost. It's certainly slower to use texture lookups for sin/cos as it is to execute the instructions.