[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=03d95bd48319256bd29cfaece45919fc58bf56cc

commit 03d95bd48319256bd29cfaece45919fc58bf56cc
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Feb 12 19:02:45 2015 +0000

    Fix exp2 spurious underflows (bug 16560).

    This patch fixes the remaining part of bug 16560, spurious underflows
    from exp2 of arguments close to 0 (when the result is close to 1, so
    should not underflow), by just using 1+x instead of a more complicated
    calculation when the argument is sufficiently small.

    Tested for x86_64, x86 and mips64.

        [BZ #16560]
        * math/e_exp2l.c [LDBL_MANT_DIG == 106] (LDBL_EPSILON): Undefine
        and redefine.
        (__ieee754_exp2l): Do not multiply small fractional parts by
        M_LN2l.
        * sysdeps/i386/fpu/e_exp2l.S (__ieee754_exp2l): Just add 1 to
        small argument.
        * sysdeps/ieee754/dbl-64/e_exp2.c (__ieee754_exp2): Likewise.
        * sysdeps/ieee754/flt-32/e_exp2f.c (__ieee754_exp2f): Likewise.
        * sysdeps/x86_64/fpu/e_exp2l.S (__ieee754_exp2l): Likewise.
        * math/auto-libm-test-in: Add more tests of exp2.
        * math/auto-libm-test-out: Regenerated.

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

Summary of changes:
 ChangeLog                        |   15 +
 NEWS                             |    2 +-
 math/auto-libm-test-in           |   18 +
 math/auto-libm-test-out          |  666 ++++++++++++++++++++++++++++++++++++++
 math/e_exp2l.c                   |    9 +
 sysdeps/i386/fpu/e_exp2l.S       |   10 +-
 sysdeps/ieee754/dbl-64/e_exp2.c  |    3 +
 sysdeps/ieee754/flt-32/e_exp2f.c |    3 +
 sysdeps/x86_64/fpu/e_exp2l.S     |   10 +-
 9 files changed, 733 insertions(+), 3 deletions(-)

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