[Bug string/28744] New: A64FX string functions are selected without SVE HWCAP

[Bug string/28744] New: A64FX string functions are selected without SVE HWCAP

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28744

            Bug ID: 28744
           Summary: A64FX string functions are selected without SVE HWCAP
           Product: glibc
           Version: 2.35
            Status: NEW
          Severity: normal
          Priority: P2
         Component: string
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: wdijkstr at arm dot com
  Target Milestone: ---

The IFUNC selector for the A64FX-optimized string functions uses them once the
implementation identifies itself as A64FX. It does not check for SVE
hypervisor/kernel support. Without these, the string functions cannot work. The
generic code should be used instead, unless there are compelling reasons not to
support this configuration.

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[Bug string/28744] A64FX string functions are selected without SVE HWCAP

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28744

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Build|                            |aarch64
                 CC|                            |fweimer at redhat dot com
              Flags|                            |security-

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[Bug string/28744] A64FX string functions are selected without SVE HWCAP

[wdijkstr at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28744

--- Comment #1 from Wilco <wdijkstr at arm dot com> ---
There wouldn't be any point in disabling SVE on A64FX! However it's easy to add
the check, I'll post a patch.

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[Bug string/28744] A64FX string functions are selected without SVE HWCAP

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28744

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Wilco Dijkstra <wilco@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e5fa62b8db546f8792ec9e5c61e6419f4f8e3f4d

commit e5fa62b8db546f8792ec9e5c61e6419f4f8e3f4d
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date:   Thu Jan 6 14:36:28 2022 +0000

    AArch64: Check for SVE in ifuncs [BZ #28744]

    Add a check for SVE in the A64FX ifuncs for memcpy, memset and memmove.
    This fixes BZ #28744.

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[Bug string/28744] A64FX string functions are selected without SVE HWCAP

[wdijkstr at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28744

--- Comment #3 from Wilco <wdijkstr at arm dot com> ---
Fixed (this can be closed but I don't seem to have the right permissions...)

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[Bug string/28744] A64FX string functions are selected without SVE HWCAP

[wdijkstr at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28744

Wilco <wdijkstr at arm dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at sourceware dot org   |wdijkstr at arm dot com

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[Bug string/28744] A64FX string functions are selected without SVE HWCAP

[wdijkstr at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28744

Wilco <wdijkstr at arm dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Wilco <wdijkstr at arm dot com> ---
Fixed

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[Bug string/28744] A64FX string functions are selected without SVE HWCAP

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28744

--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.34/master branch has been updated by Florian Weimer
<fw@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=217b84127b3a6590afcc7e198e6c3f665935e8f4

commit 217b84127b3a6590afcc7e198e6c3f665935e8f4
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date:   Thu Jan 6 14:36:28 2022 +0000

    AArch64: Check for SVE in ifuncs [BZ #28744]

    Add a check for SVE in the A64FX ifuncs for memcpy, memset and memmove.
    This fixes BZ #28744.

    (cherry picked from commit e5fa62b8db546f8792ec9e5c61e6419f4f8e3f4d)

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