[Bug math/6803] scalb(), scalbln(), scalbn() do not set errno on overflow/underflow

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https://sourceware.org/bugzilla/show_bug.cgi?id=6803

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8795b4a443a8f19d279e0c1bc99b73d1f5aec166

commit 8795b4a443a8f19d279e0c1bc99b73d1f5aec166
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Mar 31 14:57:53 2014 +0000

    Set errno for scalb errors (bug 6803, bug 6804).

    This patch fixes the default mode of scalb to set errno (bugs 6803 and
    6804).

    Previously, the _LIB_VERSION == _SVID_ mode would set errno but only
    in some relevant cases, and with various peculiarities (such as errno
    setting when an exact infinity or zero result arises with an argument
    to scalb being an infinity).  This patch leaves this mode
    bug-compatible, while making the default mode set errno in accordance
    with normal practice (so an exact infinity from an infinite argument
    is not an error, and nor is an exact zero result).  gen-libm-test.pl
    is taught new notation such as ERRNO_PLUS_OFLOW to facilitate writing
    the tests of errno setting for underflow / overflow in libm-test.inc.

    Note that bug 6803 also covers scalbn and scalbln, but this patch only
    addresses the scalb parts of that bug (along with the whole of bug
    6804).

    Tested x86_64 and x86.

        [BZ #6803]
        [BZ #6804]
        * math/w_scalb.c (__scalb): For non-SVID mode, check result and
        set errno as appropriate.
        * math/w_scalbf.c (__scalbf): Likewise.
        * math/w_scalbl.c (__scalbl): Likewise.
        * math/gen-libm-test.pl (parse_args): Handle ERRNO_PLUS_OFLOW,
        ERRNO_MINUS_OFLOW, ERRNO_PLUS_UFLOW and ERRNO_MINUS_UFLOW.
        * math/libm-test.inc (scalb_test_data): Add errno expectations.
        Add more NaN tests.

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

Summary of changes:
 ChangeLog             |   11 ++++
 NEWS                  |   10 ++--
 math/gen-libm-test.pl |   10 ++++
 math/libm-test.inc    |  134 +++++++++++++++++++++++++------------------------
 math/w_scalb.c        |   30 ++++++++++-
 math/w_scalbf.c       |   30 ++++++++++-
 math/w_scalbl.c       |   30 ++++++++++-
 7 files changed, 175 insertions(+), 80 deletions(-)

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