[Bug math/16783] New: [i386, x86_64] scalb (qNaN, -Inf) spurious "invalid" exception

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16783

            Bug ID: 16783
           Summary: [i386, x86_64] scalb (qNaN, -Inf) spurious "invalid"
                    exception
           Product: glibc
           Version: 2.19
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
              Host: i?86-*-* x86_64-*-*

On x86_64 for long double, and on x86 for all of float, double and long double,
scalb (qNaN, -Inf) raises the "invalid" exception.  As usual, when either
argument is a quiet NaN, the result should be a quiet NaN with no exceptions
raised.

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