[Bug math/20153] [ldbl-128ibm] sqrtl (sNaN) returns sNaN

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https://sourceware.org/bugzilla/show_bug.cgi?id=20153

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=98c9c9d9ca6c1eb8e30fe449b1e1121b8c498715

commit 98c9c9d9ca6c1eb8e30fe449b1e1121b8c498715
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu May 26 22:58:36 2016 +0000

    Fix ldbl-128ibm sqrtl (sNaN) (bug 20153).

    The ldbl-128ibm implementation of sqrtl wrongly returns an sNaN for
    signaling NaN arguments.  This patch fixes it to quiet its argument,
    using the same x * x + x return for infinities and NaNs as the dbl-64
    implementation uses to ensure that +Inf maps to +Inf while -Inf and
    NaN map to NaN.

    Tested for powerpc.

        [BZ #20153]
        * sysdeps/ieee754/ldbl-128ibm/e_sqrtl.c (__ieee754_sqrtl): Return
        x * x + x for infinities and NaNs.

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

Summary of changes:
 ChangeLog                             |    4 ++++
 sysdeps/ieee754/ldbl-128ibm/e_sqrtl.c |    8 +++-----
 2 files changed, 7 insertions(+), 5 deletions(-)

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