search for: convergent_op

..., the prelude we'd add // to do the first few instructions before we hit the unrolled loop // is unsafe -- it adds a control-flow dependency to the convergent // operation. Therefore restrict remainder loop (try unrollig without). // // TODO: This is quite conservative. In practice, convergent_op() // is likely to be called unconditionally in the loop. In this // case, the program would be ill-formed (on most architectures) // unless n were the same on all threads in a thread group. // Assuming n is the same on all threads, any kind of unrolling is // safe. But currently llvm...