[Bug math/19095] dbl-64 lrint incorrect for 64-bit long

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https://sourceware.org/bugzilla/show_bug.cgi?id=19095

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0e069029a8bb132876d315242054a312ae106852

commit 0e069029a8bb132876d315242054a312ae106852
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri Oct 9 00:32:14 2015 +0000

    Fix dbl-64 lrint for 64-bit long (bug 19095).

    The dbl-64 implementation of lrint produces incorrect results for some
    arguments with 64-bit long because a 32-bit (unsigned) low part of the
    mantissa is shifted left, losing high bits in the process.  This patch
    fixes this by casting to long int before shifting, as in lround (as
    this case only applies for 64-bit long, there are no issues with
    sign-extension).

    Tested for mips64 (n64).

        [BZ #19095]
        * sysdeps/ieee754/dbl-64/s_lrint.c (__lrint): Cast low part of
        mantissa to long int before shifting left.

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

Summary of changes:
 ChangeLog                        |    6 ++++++
 NEWS                             |    2 +-
 sysdeps/ieee754/dbl-64/s_lrint.c |    2 +-
 3 files changed, 8 insertions(+), 2 deletions(-)

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