[Bug math/29488] New: test-ibm128-llround fails on ppc64el when built with gcc-12 and -O2 or higher

["michael.hudson at canonical dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29488

            Bug ID: 29488
           Summary: test-ibm128-llround fails on ppc64el when built with
                    gcc-12 and -O2 or higher
           Product: glibc
           Version: 2.36
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: michael.hudson at canonical dot com
  Target Milestone: ---

root@kinetic:~/build# ./elf/ld.so --library-path .:math
./math/test-ibm128-llround
testing long double (without inline functions)
Failure: llround (0x7fffffffffffffff.8p0): Exception "Invalid operation" not
set
Failure: llround_downward (0x7fffffffffffffff.8p0): Exception "Invalid
operation" not set
Failure: llround_towardzero (0x7fffffffffffffff.8p0): Exception "Invalid
operation" not set
Failure: llround_upward (0x7fffffffffffffff.8p0): Exception "Invalid operation"
not set

Test suite completed:
  1156 test cases plus 656 tests for exception flags and
    656 tests for errno executed.
  4 errors occurred.

Recompiling math/s_llroundl.os with gcc-11 or with gcc-12 -O1 is enough to fix
this. Looking at the disassembly though I'm completely confused, feraiseexcept
(FE_INVALID); is still getting called in the failing case and the code that
runs after that looks the same (I've spent far too long trying to debug this).
I've uploaded the .o files to https://people.canonical.com/~mwh/good.o and
https://people.canonical.com/~mwh/bad.o -- good luck to the next person!

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