Quote from: gat3way on February 12, 2012, 10:22:54 AM

prefetch is a noop on GPUs. It is useful in CPU kernels only to prefetch data in CPU cache (same as what _mm_prefetch() does).

Quote

if defined VECTORS4
(v.s0==g.s0) ? uint nonce = (W[3].s0); #endif : ();
(v.s1==g.s1) ? uint nonce = (W[3].s1); #endif : ();
(v.s2==g.s2) ? uint nonce = (W[3].s2); #endif : ();
(v.s3==g.s3) ? uint nonce = (W[3].s3); #endif : ();
...
#endif

This is also not possible, it's an illegal construction that would fail the compilation. (v.s0==g.s0) is evaluated at run-time and the results are unknown to the preprocessor. If you need to terminate execution before write, you can just do that:

if (!nonce) return;

I am not sure it would make much of a difference though.

I knew this was an illegal instruction and even said this in the exact same post you quoted from. I posted the above statement to ask if there was any way to accomplish the above task legally. So, it seems that a series of if statements may be the only legal way to accomplish it.

I want it to check if v.s0==g.s0 and, if so, uint nonce = (W[3].s0) then stop checking the series of if statements as none of the rest will do anything but add unnecessary cycles. If not, do nothing and continue to the next if statement. At the end, if (exists(nonce)) {output...}. I would daisy-chain some if statements together if I thought they would work.
if defined VECTORS4
(v.s0==g.s0) ? uint nonce = (W[3].s0), #return : (v.s1==g.s1) ? uint nonce = (W[3].s1), #return : (v.s2==g.s2) ? uint nonce = (W[3].s2), #return : (v.s3==g.s3) ? uint nonce = (W[3].s3) : ();
...
#endif

But I need to figure out how to accomplish the above without having to put [uint nonce =] at the beginning of it. So, again, what will work? Just a bunch of branched if statements in a row?