[Bug math/16560] spurious underflow exception from exp2/exp10

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https://sourceware.org/bugzilla/show_bug.cgi?id=16560

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a638de828d877376fb238efc8b0bc9220dd2601e

commit a638de828d877376fb238efc8b0bc9220dd2601e
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jun 25 11:33:22 2014 +0000

    Fix exp10 spurious underflows (bug 16560).

    This patch fixes spurious underflows from exp10 for arguments near 0
    (part of bug 16560; that bug also includes spurious underflows from
    exp2, which are not fixed by this patch).  The problem is underflows
    in the internal computation converting the exp10 argument to arguments
    for exp (with extra precision), and the fix is simply to return 1
    early for arguments near enough to 0 (just as arguments with large
    enough magnitude have their own overflow / underflow logic at the
    start of the function).

    Tested x86_64 and x86 and ulps updated accordingly; also tested for
    powerpc32 and mips64 to validate the ldbl-128ibm and ldbl-128 changes.

        [BZ #16560]
        * sysdeps/ieee754/dbl-64/e_exp10.c (__ieee754_exp10): Return 1 for
        arguments close to 0.
        * sysdeps/ieee754/ldbl-128/e_exp10l.c (__ieee754_exp10l):
        Likewise.
        * sysdeps/ieee754/ldbl-128ibm/e_exp10l.c (__ieee754_exp10l):
        Likewise.
        * math/auto-libm-test-in: Add more tests of exp10.
        * math/auto-libm-test-out: Regenerated.
        * sysdeps/x86_64/fpu/libm-test-ulps: Update.

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

Summary of changes:
 ChangeLog                              |   11 +
 math/auto-libm-test-in                 |   18 +
 math/auto-libm-test-out                |  666 ++++++++++++++++++++++++++++++++
 sysdeps/ieee754/dbl-64/e_exp10.c       |    2 +
 sysdeps/ieee754/ldbl-128/e_exp10l.c    |    2 +
 sysdeps/ieee754/ldbl-128ibm/e_exp10l.c |    2 +
 sysdeps/x86_64/fpu/libm-test-ulps      |    8 +
 7 files changed, 709 insertions(+), 0 deletions(-)

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