[Bug math/29463] New: math/test-float128-y1 fails on x86_64

[Bug math/29463] New: math/test-float128-y1 fails on x86_64

[michael.hudson at canonical dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29463

            Bug ID: 29463
           Summary: math/test-float128-y1 fails on x86_64
           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: ---

Building glibc 2.36 on Ubuntu 22.10 using gcc 12 fails like so:

FAIL: math/test-float128-y1
original exit status 1
testing _Float128 (without inline functions)
Failure: Test: y1_downward (0x1.c1badep+0)
Result:
 is:         -2.49850711930108135145795303826944004e-01 
-0x1.ffb1bae4fa20118544b142160f5fp-3
 should be:  -2.49850711930108135145795303826943836e-01 
-0x1.ffb1bae4fa20118544b142160f58p-3
 difference:  1.68518870133883137142398069976181140e-34  
0x1.c000000000000000000000000000p-113
 ulp       :  7.0000
 max.ulp   :  5.0000
Maximal error of `y1_downward'
 is      : 7 ulp
 accepted: 5 ulp

Test suite completed:
  216 test cases plus 212 tests for exception flags and
    212 tests for errno executed.
  2 errors occurred.

I'm reasonably confident but not yet certain that building with gcc 11 works. I
see that fedora 37 built glibc 2.36 with gcc 12 without hitting this issue, so
it's possible it's the result of some Ubuntu-specific gcc issue but I'm not
really sure.

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[Bug math/29463] math/test-float128-y1 fails on x86_64

[michael.hudson at canonical dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29463

--- Comment #1 from Michael Hudson-Doyle <michael.hudson at canonical dot com> ---
Turns out compiling just math/e_j1f128.os with gcc 11 is enough to make this
failure go away. So probably a gcc issue indeed.

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[Bug math/29463] math/test-float128-y1 fails on x86_64

[michael.hudson at canonical dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29463

--- Comment #2 from Michael Hudson-Doyle <michael.hudson at canonical dot com> ---
Compiling just math/e_j1f128.os with gcc 12 and -O2 rather than -O3 also fixes
this.

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[Bug math/29463] math/test-float128-y1 fails on x86_64

[michael.hudson at canonical dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29463

--- Comment #3 from Michael Hudson-Doyle <michael.hudson at canonical dot com> ---
I filed https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106574 although at this
point it's not clear where the issue is.

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[Bug math/29463] math/test-float128-y1 fails on x86_64

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29463

--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tulio Magno Quites Machado Filho
<tuliom@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b6e37b7805b0182c3e25cdab39ebf5f001c04d05

commit b6e37b7805b0182c3e25cdab39ebf5f001c04d05
Author: Michael Hudson-Doyle <michael.hudson@canonical.com>
Date:   Mon Aug 22 14:05:04 2022 +1200

    Fix BZ #29463 in the ibm128 implementation of y1l too

    Avoid moving code across SET_RESTORE_ROUNDL in order to fix
    [BZ #29463].

    Tested-by: Aurelien Jarno <aurelien@aurel32.net>
    Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
    Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>

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[Bug math/29463] math/test-float128-y1 fails on x86_64

[adhemerval.zanella at linaro dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29463

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.37
                 CC|                            |adhemerval.zanella at linaro dot o
                   |                            |rg

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[Bug math/29463] math/test-float128-y1 fails on x86_64

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29463

--- Comment #6 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.36/master branch has been updated by Aurelien Jarno
<aurel32@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b357157361117182c7a68c90fda7ba431b64442c

commit b357157361117182c7a68c90fda7ba431b64442c
Author: Michael Hudson-Doyle <michael.hudson@canonical.com>
Date:   Mon Aug 22 14:05:04 2022 +1200

    Fix BZ #29463 in the ibm128 implementation of y1l too

    Avoid moving code across SET_RESTORE_ROUNDL in order to fix
    [BZ #29463].

    Tested-by: Aurelien Jarno <aurelien@aurel32.net>
    Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
    Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
    (cherry picked from commit b6e37b7805b0182c3e25cdab39ebf5f001c04d05)

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