[Bug math/16559] New: Missing underflow exception from jn

["zimmerma+gcc at loria dot fr" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16559

            Bug ID: 16559
           Summary: Missing underflow exception from jn
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: zimmerma+gcc at loria dot fr

on x86_64 I get:

Testing function j42 for exponent 10 [seed=11308].
 rounding mode MPFR_RNDN:
      wrong underflow flag for x=-8.000000@-38
      library gives 0
      mpfr    gives 0
      underflow: mpfr 1, library 0

Since the result is 0 and inexact, and underflow exception should be raised.

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