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[Bug math/18583] fmodl, remainderl spurious inexact for NaN results


https://sourceware.org/bugzilla/show_bug.cgi?id=18583

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8b1bab5ffa235bc494c33fdbe4c9994202936cfc

commit 8b1bab5ffa235bc494c33fdbe4c9994202936cfc
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Jun 23 17:26:46 2015 +0000

    Fix spurious "inexact" exceptions from __kernel_standard_l (bug 18245, bug
18583).

    __kernel_standard_l converts long double arguments to double for use
    in SVID "struct exception".  This has special-case handling for when
    that conversion would overflow or underflow but the original long
    double function wouldn't.  However, it turns out that "inexact"
    exceptions can be spurious here as well, when the function is exactly
    determined and __kernel_standard_l is being called for a domain error.
    This patch fixes this by using feholdexcept / fesetenv to avoid
    exceptions from the conversion, replacing the previous special-case
    logic for overflow and underflow (this covers all functions using
    __kernel_standard_l, not just those that actually need a change, since
    there doesn't seem to be much point in restricting things just to the
    functions that mustn't get "inexact" here).

    Tested for x86_64 and x86.

        [BZ #18245]
        [BZ #18583]
        * sysdeps/ieee754/k_standardl.c: Include <fenv.h>.
        (__kernel_standard_l): Use feholdexcept and fesetenv around
        conversion to double instead of special-casing overflow and
        underflow.
        * math/libm-test.inc (fmod_test_data): Add more tests.
        (remainder_test_data): Likewise.
        (sqrt_test_data): Likewise.

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

Summary of changes:
 ChangeLog                     |   12 ++++++++++++
 NEWS                          |   12 ++++++------
 math/libm-test.inc            |    9 +++++++++
 sysdeps/ieee754/k_standardl.c |   34 +++++++++-------------------------
 4 files changed, 36 insertions(+), 31 deletions(-)

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