[Mesa-dev] [Bug 101952] OpenCL enqueueReadBuffer returns trash

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101952

--- Comment #4 from Janpieter Sollie <janpieter.sollie at dommel.be> ---
yes, a simpler kernel works perfectly.  Though I think it only makes the search
more difficult:
the combination of these functions does not work (no 255 is visible):
in external_function_call:
     while (left > 0) {
                count++;
                extern2(2048, count, digest);
                plen = left > SHA1_MAC_LEN ? SHA1_MAC_LEN : left;
//              result = get_global_id(0) | get_global_id(1) |
get_global_id(2);
                result += os_memcmp(digest, pos, plen);
                pos += plen;
                left -= plen;
        }
        return result;
in startTest:
    if(result == 2) {
        output[3] = 255;
        output[0] = get_global_id(0);
        output[1] = get_global_id(1);
        output[2] = get_global_id(2);
    }
----------------------------------------
while 
              result = get_global_id(0) | get_global_id(1) | get_global_id(2);
//            result += os_memcmp(digest, pos, plen);

and
    if(result == 0) {

does work! (255 int included) :s

I suspect an overflow happens somewhere, but is it possible oclgrind does not
detect it?

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