[Bug math/15479] ceil, floor and round and trunc raise inexact exception

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https://sourceware.org/bugzilla/show_bug.cgi?id=15479

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=876c5bd30cf44ab47ee46c08d06e6ba9ab2b338f

commit 876c5bd30cf44ab47ee46c08d06e6ba9ab2b338f
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue May 24 17:44:46 2016 +0000

    Do not raise "inexact" from generic floor (bug 15479).

    C99 and C11 allow but do not require ceil, floor, round and trunc to
    raise the "inexact" exception for noninteger arguments.  TS 18661-1
    requires that this exception not be raised by these functions.  This
    aligns them with general IEEE semantics, where "inexact" is only
    raised if the final step of rounding the infinite-precision result to
    the result type is inexact; for these functions, the
    infinite-precision integer result is always representable in the
    result type, so "inexact" should never be raised.

    The generic implementations of ceil, floor and round functions contain
    code to force "inexact" to be raised.  This patch removes it for floor
    functions to align them with TS 18661-1 in this regard.  Note that
    some architecture-specific versions may still raise "inexact", so the
    tests are not updated and the bug is not yet fixed.

    Tested for x86_64, x86 and mips64.

        [BZ #15479]
        * sysdeps/ieee754/dbl-64/s_floor.c: Do not mention "inexact"
        exception in comment.
        (huge): Remove variable.
        (__floor): Do not force "inexact" exception.
        * sysdeps/ieee754/dbl-64/wordsize-64/s_floor.c: Do not mention
        "inexact" exception in comment.
        (huge): Remove variable.
        (__floor): Do not force "inexact" exception.
        * sysdeps/ieee754/flt-32/s_floorf.c: Do not mention "inexact"
        exception in comment.
        (huge): Remove variable.
        (__floorf): Do not force "inexact" exception.
        * sysdeps/ieee754/ldbl-128/s_floorl.c: Do not mention "inexact"
        exception in comment.
        (huge): Remove variable.
        (__floorl): Do not force "inexact" exception.

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

Summary of changes:
 ChangeLog                                    |   18 ++++++++++++
 sysdeps/ieee754/dbl-64/s_floor.c             |   10 +-----
 sysdeps/ieee754/dbl-64/wordsize-64/s_floor.c |    9 +-----
 sysdeps/ieee754/flt-32/s_floorf.c            |    9 +-----
 sysdeps/ieee754/ldbl-128/s_floorl.c          |   37 ++++++++++----------------
 5 files changed, 38 insertions(+), 45 deletions(-)

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