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<th style="text-align: right; padding-right: 16px;" align="right">Repository</th>
<td>behdad/harfbuzz</td>
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<th style="text-align: right; padding-right: 16px;" align="right">Build #33</th>
<td><a href="http://mandrillapp.com/track/click.php?u=30007208&id=3a1b3e912fb843a7a411382e819892b9&url=https%3A%2F%2Ftravis-ci.org%2Fbehdad%2Fharfbuzz%2Fbuilds%2F6745253&url_id=614e7da59baa3411780b9e02b3ad2df3915750bd&tags=_all,_sendnotifications@travis-ci.org,production">https://travis-ci.org/behdad/harfbuzz/builds/6745253</a></td>
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<th style="text-align: right; padding-right: 16px;" align="right">Changeset</th>
<td><a href="http://mandrillapp.com/track/click.php?u=30007208&id=3a1b3e912fb843a7a411382e819892b9&url=https%3A%2F%2Fgithub.com%2Fbehdad%2Fharfbuzz%2Fcompare%2F34be28eedcbb%5E...1761f9b9b4ba&url_id=a49b93abf6e14b1783f54e25c733a378a3cc11d2&tags=_all,_sendnotifications@travis-ci.org,production">https://github.com/behdad/harfbuzz/compare/34be28eedcbb^...1761f9b9b4ba</a></td>
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<td> </td>
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<th style="text-align: right; padding-right: 16px;" align="right">Commit</th>
<td>1761f9b (accelerate-lookups)</td>
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<th style="text-align: right; padding-right: 16px;" align="right">Message</th>
<td>[OTLayout] Accelerate lookups by batching<br><br>If we need to apply many many lookups, we can fasten that up by applying<br>them in batches. For each batch we keep the union of the coverage of<br>the lookups participating. We can then skip glyph ranges that do NOT<br>participate in any lookup in the batch. The batch partition is<br>determined optimally by a mathematical probability model on the glyphs<br>and a dynamic-program to optimize the partition.<br><br>The net effect is 30% speedup on Amiri. the downside is more memory<br>consuption as each batch will keep an hb_set_t of its coverage.<br><br>I'm not yet convinced that the tradeoff is worth pursuing. I'm trying<br>to find out ways to optimized this more, with less memory overhead.<br><br>This work also ignores the number of subtables per lookup. That may<br>prove to be very important for the performance numbers from here on.</td>
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<th style="text-align: right; padding-right: 16px;" align="right">Author</th>
<td>Behdad Esfahbod</td>
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<th style="text-align: right; padding-right: 16px;" align="right">Duration</th>
<td>1 minute and 22 seconds</td>
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