I wrote some OpenCL code recently, wrapped in a rust program using opencl3. My CL code was pretty slow early on, it's a math heavy problem implemented initially

I wrote some OpenCL code recently, wrapped in a rust program using opencl3. My CL code was pretty slow early on, it's a math heavy problem implemented initially with a bunch of for loops. I largely "optimized" it by smattering the code with #pragma unroll, which was exceptionally effective for the problem at hand, given that I had tons of statically defined loops that could be easily unrolled. I know rust has a tendency to aggressively inline and flatten everything, but I'm curious about things like this, where it can be so important in this domain to ensure things are unrolled, as the loop conditionals can otherwise introduce pipeline/concurrency issues.