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#pragma omp parallel for
for( ; dsvc < dsvc_end; ++dsvc, ++ssvc ) {
    if ( ! *dsvc )
        *dsvc = *ssvc;
}

/* Do it. */
#pragma omp parallel for
for( o = 0; o < len; ++o ) {
    if ( ! *( dsvc + o ) )
        *(dsvc+o) = *(ssvc+o);
}

                      Rate moritz_inplace dio_openmp swap dio_noopenmp
+ avar_tye_c_inplace avar_c_inplace dio_c
moritz_inplace      1948/s             --       -64% -66%         -68%
+               -69%           -73%  -83%
dio_openmp          5344/s           174%         --  -7%         -13%
+               -15%           -26%  -54%
...
avar_tye_c_inplace  6286/s           223%        18%   9%           3%
+                 --           -12%  -45%
avar_c_inplace      7178/s           269%        34%  25%          17%
+                14%             --  -38%
dio_c              11495/s           490%       115% 100%          88%
+                83%            60%    --