[Bug math/16770] scalb spurious "invalid" exceptions

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https://sourceware.org/bugzilla/show_bug.cgi?id=16770

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ea6029b19c6004c69a9074bf399091bbfbf58a0c

commit ea6029b19c6004c69a9074bf399091bbfbf58a0c
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Sat Mar 29 17:22:14 2014 +0000

    Fix scalb spurious "invalid" exceptions (bug 16770).

    This patch fixes bug 16770, spurious "invalid" exceptions from scalb
    when testing whether the second argument is an integer, by inserting
    appropriate range checks to determine whether a cast to int is safe.
    (Note that invalid_fn is a function that handles both nonintegers and
    large integers, distinguishing them reliably using functions such as
    __rint; note also that there are no issues with scalb needing to avoid
    spurious "inexact" exceptions - it's an old-POSIX XSI function, not a
    standard C function bound to an IEEE 754 operation - although the
    return value is still fully determined.)

    Tested x86_64 and x86.

        [BZ #16770]
        * math/e_scalb.c (__ieee754_scalb): Check second argument is not
        too large before casting to int.
        * math/e_scalbf.c (__ieee754_scalbf): Likewise.
        * math/e_scalbl.c (__ieee754_scalbl): Likewise.
        * math/libm-test.inc (scalb_test_data): Add more tests.

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

Summary of changes:
 ChangeLog          |    9 +++++++++
 NEWS               |    2 +-
 math/e_scalb.c     |    2 +-
 math/e_scalbf.c    |    2 +-
 math/e_scalbl.c    |    2 +-
 math/libm-test.inc |   17 +++++++++++++++++
 6 files changed, 30 insertions(+), 4 deletions(-)

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