[Bug target/59833] New: ARM soft-float extendsfdf2 fails to quiet signaling NaN

[jsm28 at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59833

            Bug ID: 59833
           Summary: ARM soft-float extendsfdf2 fails to quiet signaling
                    NaN
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jsm28 at gcc dot gnu.org
            Target: arm*-*-*

The ARM soft-float aeabi_f2d / extendsfdf2 converts a signaling NaN to another
signaling NaN, when it should quiet it.  This causes the glibc math/basic-test
to fail:

Failure:  double x = (double) (float) sNaN, !issignaling