[Bug math/18610] New: S390: fetestexcept() reports any exception if DXC-code contains a vector instruction exception.

[Bug math/18610] New: S390: fetestexcept() reports any exception if DXC-code contains a vector instruction exception.

[stli at linux dot vnet.ibm.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18610

            Bug ID: 18610
           Summary: S390: fetestexcept() reports any exception if DXC-code
                    contains a vector instruction exception.
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: stli at linux dot vnet.ibm.com
  Target Milestone: ---

On s390, the DXC(data-exception-code)-byte in FPC(floating-point-control)-
register contains a code of the last occured exception.
If bits 6 and 7 of DXC-byte are zero, the bits 0-5 correspond to the
ieee-exception flag bits.
The current implementation always uses these bits as ieee-exception flag bits.
fetestexcept() reports any exception after the first usage of a
vector-instruction in a process, because it raises an "vector instruction
exception" with DXC-code 0xFE.
This is the same if the DXC-code contains other exception codes like
"DFP instruction" or "Compare-and-trap instruction".

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[Bug math/18610] S390: fetestexcept() reports any exception if DXC-code contains a vector instruction exception.

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18610

--- Comment #1 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
If

commit 5d96fe8c0dc3450bafe6c2aae2dabc76819df3e0
Author: Stefan Liebler <stli@linux.vnet.ibm.com>
Date:   Wed Aug 26 10:26:18 2015 +0200

    S390: Fix handling of DXC-byte in FPC-register.

did indeed fix this bug (as implied by it having been added to NEWS), please
close it as FIXED with the milestone set to 2.23.

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[Bug math/18610] S390: fetestexcept() reports any exception if DXC-code contains a vector instruction exception.

[stli at linux dot vnet.ibm.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18610

Stefan Liebler <stli at linux dot vnet.ibm.com> changed:

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

--- Comment #2 from Stefan Liebler <stli at linux dot vnet.ibm.com> ---
fixed with commit
https://sourceware.org/git/?p=glibc.git;a=commit;h=5d96fe8c0dc3450bafe6c2aae2dabc76819df3e0

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[Bug math/18610] S390: fetestexcept() reports any exception if DXC-code contains a vector instruction exception.

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18610

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.23

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