Messages in this thread | | | Date | Sat, 12 Jan 2002 13:02:57 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] 1-2-3 GB |
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Hugh Dickins wrote: > ... > The patch below seems to be enough to convince egcs-2.91.66 and > gcc-2.95.3 to use a "jb" comparison there. > ... > - for (j = 0; j < PTRS_PER_PMD ; j++) { > - prefetchw(pmd+j+(PREFETCH_STRIDE/16)); > - free_one_pmd(pmd+j); > + for (md = pmd, emd = pmd + PTRS_PER_PMD; md < emd; md++) { > + prefetchw(md+(PREFETCH_STRIDE/16)); > + free_one_pmd(md);
You need to add a big fat comment here, describing the compiler problem, and the risks which attend any change to this code.
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