Public bug reported:
Please pick the glibc commit "S390: Mark vx and vxe as important hwcap.". This
commit is already cherry-picked to glibc 2.29 release branch:
https://sourceware.org/git/?p=glibc.git;a=commit;h=6eb48fe80cb6dd3ef536e86d005976d1c22b170e.
Note: This commit is also cherry-picked to glibc 2.27, 2.28 release branches.
This commit allows to have a library (e.g. libatlas) with different
tunings, e.g. one with vx- and another one with vxe-instructions. With
this patch, glibc chooses the "best" available version depending on the
hwcaps reported by the kernel.
The correct locations for the different tuned libraries are:
-for z14 with vxe-support: /usr/lib/s390x-linux-gnu/vxe/
-for z13 with vx-support: /usr/lib/s390x-linux-gnu/vx/
-for all without vector-support: /usr/lib/s390x-linux-gnu/
As information:
One could also place the libraries into z13 or z14 subfolders. But e.g. if you
run on a z13 and vector support is disabled (e.g. by specified
kernel-parameter), the "z13" library with vector instructions is chosen - which
is NOT allowed!
Contact Information =
---uname output---
Machine Type =
---Steps to Reproduce---
see "problem description"
Userspace tool common name: glibc
Userspace rpm: libc6
The userspace tool has the following bit modes: both
Userspace tool obtained from project website: na
*Additional Instructions for :
-Attach ltrace and strace of userspace application.
** Affects: glibc (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-176286 severity-medium
targetmilestone-inin1904
** Tags added: architecture-s39064 bugnameltc-176286 severity-medium
targetmilestone-inin1904
** Changed in: ubuntu
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Package changed: ubuntu => glibc (Ubuntu)
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https://bugs.launchpad.net/bugs/1821200
Title:
Mark vx and vxe as important hwcap to be able to provide differently
tuned shared libraries.
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