[Bug 1932010] Comment bridged from LTC Bugzilla
Simon Chopin
1932010 at bugs.launchpad.net
Wed Aug 11 11:33:13 UTC 2021
> However, I'm not quite sure why does
>
> ++#ifdef S390_CRC32_VX
> ++ if (getauxval(AT_HWCAP) & HWCAP_S390_VX)
> ++ return s390_crc32_vx;
> ++#endif
>
> work. For me getauxval() causes a segfault when called from an ifunc,
> that's why I have to use the s390-specific ifunc's hwcap parameter.
Perhaps a bug in your compiler version?
In any case, I believe we can consider the current patch as working as
intended, despite this mystery.
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https://bugs.launchpad.net/bugs/1932010
Title:
[21.10 FEAT] zlib CRC32 optimization for s390x
Status in Ubuntu on IBM z Systems:
In Progress
Status in zlib package in Ubuntu:
In Progress
Bug description:
Use SIMD instructions to accelerate the zlib CRC32 implementation.
Business value: Performance improvement in database area
The zlib CRC32 optimization for IBM Z is currently being discussed for inclusion into zlib-ng:
https://github.com/zlib-ng/zlib-ng/pull/912
The patch for zlib will be based on that.
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