[Libclc-dev] [PATCH 0/2] More trig builtins

[Aaron Watry]

I've implemented asin in terms of acos (which was sent to the list
a few days ago).

Tangent is implemented using a sin and a square root instead of sin(x)/cos(x).
sin(x)/cos(x) which produces much more verbose assembly than using the sqrt.

That being said, I am not sure if there's a better way to implement tan(x)
while still keeping the required precision.  If someone has a better option,
I'm all ears.  This implementation passes the piglit unit tests, at least.

I haven't checked if llvm.sin and llvm.cos intrinsics have enough precision for
float when used together (they didn't for just calculating sin/cos, so I figured
using both intrinsics together would just increase the error).