[Bug math/18595] New: ctan, ctanh missing underflows

[Bug math/18595] New: ctan, ctanh missing underflows

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18595

            Bug ID: 18595
           Summary: ctan, ctanh 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: ---

ctan and ctanh fail to raise underflow exceptions for some cases that should
underflow, e.g. for float on x86_64:

Failure: Real part of: ctan (-0x8p-152 + +0 i): Exception "Underflow" not set
Failure: Real part of: ctanh (+0 - 0x8p-152 i): Exception "Underflow" not set

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[Bug math/18595] ctan, ctanh missing underflows

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18595

--- 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  0b87419b690d1711697ed95808527400910ff997 (commit)
      from  694aabefd2eb3a0e2c5624d7feb1d7310b2bdd8b (commit)

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0b87419b690d1711697ed95808527400910ff997

commit 0b87419b690d1711697ed95808527400910ff997
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Sep 15 17:46:08 2015 +0000

    Fix ctan, ctanh missing underflows (bug 18595).

    Similar to various other bugs in this area, ctan and ctanh can fail to
    raise the underflow exception for some cases of results that are tiny
    and inexact.  This patch forces the exception in a similar way to
    previous fixes.

    Tested for x86_64 and x86.

        [BZ #18595]
        * math/s_ctan.c (__ctan): Force underflow exception for results
        whose real or imaginary part has small absolute value.
        * math/s_ctanf.c (__ctanf): Likewise.
        * math/s_ctanh.c (__ctanh): Likewise.
        * math/s_ctanhf.c (__ctanhf): Likewise.
        * math/s_ctanhl.c (__ctanhl): Likewise.
        * math/s_ctanl.c (__ctanl): Likewise.
        * math/auto-libm-test-in: Do not allow missing underflow for ctan
        and ctanh.  Add more tests of ctan and ctanh.

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

Summary of changes:
 ChangeLog               |   11 +
 NEWS                    |    8 +-
 math/auto-libm-test-in  |   26 +-
 math/auto-libm-test-out | 1032 ++++++++++++++++++++++++++++++++++++++---------
 math/s_ctan.c           |   10 +
 math/s_ctanf.c          |   10 +
 math/s_ctanh.c          |   10 +
 math/s_ctanhf.c         |   10 +
 math/s_ctanhl.c         |   10 +
 math/s_ctanl.c          |   10 +
 10 files changed, 923 insertions(+), 214 deletions(-)

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[Bug math/18595] ctan, ctanh missing underflows

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18595

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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