[Bug math/18647] powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf

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https://sourceware.org/bugzilla/show_bug.cgi?id=18647

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cf36e5034fa8ed5d44036bce09a55a7f00d19252

commit cf36e5034fa8ed5d44036bce09a55a7f00d19252
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Aug 5 15:01:58 2015 +0000

    Fix powf (close to -1, large) (bug 18647).

    The flt-32 implementation of powf wrongly uses x-1 instead of |x|-1
    when computing log (x) for the case where |x| is close to 1 and y is
    large.  This patch fixes the logic accordingly.  Relevant tests
    existed for x close to 1, and corresponding tests are added for x
    close to -1, as well as for some new variant cases.

    Tested for x86_64 and x86.

        [BZ #18647]
        * sysdeps/ieee754/flt-32/e_powf.c (__ieee754_powf): For large y
        and |x| close to 1, use absolute value of x when computing log.
        * math/auto-libm-test-in: Add more tests of pow.
        * math/auto-libm-test-out: Regenerated.

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

Summary of changes:
 ChangeLog                       |    8 +
 NEWS                            |    2 +-
 math/auto-libm-test-in          |   40 +
 math/auto-libm-test-out         | 5611 +++++++++++++++++++++++++++++++++++++++
 sysdeps/ieee754/flt-32/e_powf.c |    2 +-
 5 files changed, 5661 insertions(+), 2 deletions(-)

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