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

["stli at linux dot vnet.ibm.com" <sourceware-bugzilla at sourceware dot org>]

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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