[Bug math/16526] New: Missing underflow exception from sincos

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

https://sourceware.org/bugzilla/show_bug.cgi?id=16526

            Bug ID: 16526
           Summary: Missing underflow exception from sincos
           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 we get (where sincos1 compute the sine using the sincos function):

Testing function sincos1 for exponent 0 [seed=1823].
 rounding mode MPFR_RNDN:
      wrong underflow flag for x=4.0000000000000@-269
      library gives 4.0000000000000@-269
      mpfr    gives 4.0000000000000@-269
      underflow: mpfr 1, library 0

Since 4.0000000000000@-269 = 0x1p-1074 is the smallest subnormal, an underflow
exception should be raised.

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