[Bug math/18586] New: [ldbl-128] expl missing underflows

[Bug math/18586] New: [ldbl-128] expl missing underflows

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18586

            Bug ID: 18586
           Summary: [ldbl-128] expl missing underflows
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---

The following failures are seen in long double testing for mips64 (these are
test inputs already in the testsuite):

Failure: exp (-0x2.c5b2319c4843cp+12): Exception "Underflow" not set
Failure: exp_downward (-0x2.c5b2319c4843accp+12): Exception "Underflow" not set
Failure: exp_downward (-0x2.c5b2319c4843cp+12): Exception "Underflow" not set
Failure: exp_downward (-0x2.c5b234p+12): Exception "Underflow" not set
Failure: exp_towardzero (-0x2.c5b2319c4843accp+12): Exception "Underflow" not
set
Failure: exp_towardzero (-0x2.c5b2319c4843cp+12): Exception "Underflow" not set
Failure: exp_towardzero (-0x2.c5b234p+12): Exception "Underflow" not set

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[Bug math/18586] [ldbl-128] expl missing underflows

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18586

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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       via  8475ab16848cf2adb6ce3446749c2f1d10233286 (commit)
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8475ab16848cf2adb6ce3446749c2f1d10233286

commit 8475ab16848cf2adb6ce3446749c2f1d10233286
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jun 24 15:12:03 2015 +0000

    Fix ldbl-128 expl missing underflows (bug 18586).

    Similar to various other bugs in this area, the ldbl-128 expl
    implementation does not raise the underflow exception for all
    subnormal results, if the scaling down is exact although the actual
    result is inexact.  This patch fixes this by forcing the exception in
    this case (the tests that failed before and pass after the test are
    already in the testsuite).

    Tested for mips64.

        [BZ #18586]
        * sysdeps/ieee754/ldbl-128/e_expl.c (__ieee754_expl): Force
        underflow exception for small results.

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

Summary of changes:
 ChangeLog                         |    6 ++++++
 NEWS                              |    2 +-
 sysdeps/ieee754/ldbl-128/e_expl.c |   10 +++++++++-
 3 files changed, 16 insertions(+), 2 deletions(-)

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[Bug math/18586] [ldbl-128] expl missing underflows

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18586

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

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

--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Fixed for 2.22.

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