[Bug math/19078] New: [ldbl-128ibm] expl overflow incorrect in non-default rounding modes

[Bug math/19078] New: [ldbl-128ibm] expl overflow incorrect in non-default rounding modes

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19078

            Bug ID: 19078
           Summary: [ldbl-128ibm] expl overflow incorrect in non-default
                    rounding modes
           Product: glibc
           Version: 2.22
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---
              Host: powerpc*-*-*

The ldbl-128ibm expl wrapper checks the argument to determine when to call
__kernel_standard_l, thereby overriding overflowing results from __ieee754_expl
that could otherwise (given appropriately patched libgcc) be correct for the
rounding mode.  E.g.:

Failure: Test: exp_downward (0x2.c5c85cp+12)
Result:
 is:          inf   inf
 should be:   1.79769313486231580793728971405301e+308  
0x1.fffffffffffff7ffffffffffff8p+1023

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[Bug math/19078] [ldbl-128ibm] expl overflow incorrect in non-default rounding modes

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19078

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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The branch, master has been updated
       via  6c9678ebd42358f931100130a368fafe375a0ba2 (commit)
      from  b3364d05892be0170e8f67689736bb9b7597bc94 (commit)

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6c9678ebd42358f931100130a368fafe375a0ba2

commit 6c9678ebd42358f931100130a368fafe375a0ba2
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Oct 6 17:37:49 2015 +0000

    Fix ldbl-128ibm expl overflow in non-default rounding modes (bug 19078).

    The ldbl-128ibm expl wrapper checks the argument to determine when to
    call __kernel_standard_l, thereby overriding overflowing results from
    __ieee754_expl that could otherwise (given appropriately patched
    libgcc) be correct for the rounding mode.  This patch changes it to
    check the result of __ieee754_expl instead, as other versions of this
    wrapper do.

    Tested for powerpc.

        [BZ #19078]
        * sysdeps/ieee754/ldbl-128ibm/w_expl.c (o_thres): Remove variable.
        (u_thres): Likewise.
        (__expl): Determine whether to call __kernel_standard_l based on
        value of result, not argument.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                            |    6 ++++++
 NEWS                                 |    2 +-
 sysdeps/ieee754/ldbl-128ibm/w_expl.c |    7 ++-----
 3 files changed, 9 insertions(+), 6 deletions(-)

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[Bug math/19078] [ldbl-128ibm] expl overflow incorrect in non-default rounding modes

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19078

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |2.23

--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Fixed for 2.23.

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