------- Comment From tuli...@br.ibm.com 2018-08-20 14:53 EDT------- > IBM, 18.10 feature freeze is on the 23rd of Aug, any news on the upstream > status of this patch?
The patch has been waiting for the zlib maintainer since Feb. 6th. Likewise for all the pull requests submitted since January: https://github.com/madler/zlib/pulls?q=is%3Aopen+is%3Apr Canonical, would it be possible to carry this patchset out-of-tree? -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to zlib in Ubuntu. https://bugs.launchpad.net/bugs/1742941 Title: [18.10] zlib: improve crc32 performance on P8 Status in The Ubuntu-power-systems project: Incomplete Status in zlib package in Ubuntu: New Bug description: Calculate the checksum of data that is 16 byte aligned and a multiple of 16 bytes. The first step is to reduce it to 1024 bits. We do this in 8 parallel chunks in order to mask the latency of the vpmsum instructions. If we have more than 32 kB of data to checksum we repeat this step multiple times, passing in the previous 1024 bits. The next step is to reduce the 1024 bits to 64 bits. This step adds 32 bits of 0s to the end - this matches what a CRC does. We just calculate constants that land the data in this 32 bits. We then use fixed point Barrett reduction to compute a mod n over GF(2) for n = CRC using POWER8 instructions. We use x = 32. http://en.wikipedia.org/wiki/Barrett_reduction To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1742941/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
