1. 18 Aug, 2007 10 commits
  2. 17 Aug, 2007 2 commits
    • David S. Miller's avatar
      [MATH-EMU]: Fix underflow exception reporting. · 40584961
      David S. Miller authored
      The underflow exception cases were wrong.
      
      This is one weird area of ieee1754 handling in that the underflow
      behavior changes based upon whether underflow is enabled in the trap
      enable mask of the FPU control register.  As a specific case the Sparc
      V9 manual gives us the following description:
      
      --------------------
      If UFM = 0:     Underflow occurs if a nonzero result is tiny and a
                      loss of accuracy occurs.  Tininess may be detected
                      before or after rounding.  Loss of accuracy may be
                      either a denormalization loss or an inexact result.
      
      If UFM = 1:     Underflow occurs if a nonzero result is tiny.
                      Tininess may be detected before or after rounding.
      --------------------
      
      What this amounts to in the packing case is if we go subnormal,
      we set underflow if any of the following are true:
      
      1) rounding sets inexact
      2) we ended up rounding back up to normal (this is the case where
         we set the exponent to 1 and set the fraction to zero), this
         should set inexact too
      3) underflow is set in FPU control register trap-enable mask
      
      The initially discovered example was "DBL_MIN / 16.0" which
      incorrectly generated an underflow.  It should not, unless underflow
      is set in the trap-enable mask of the FPU csr.
      
      Another example, "0x0.0000000000001p-1022 / 16.0", should signal both
      inexact and underflow.  The cpu implementations and ieee1754
      literature is very clear about this.  This is case #2 above.
      
      However, if underflow is set in the trap enable mask, only underflow
      should be set and reported as a trap.  That is handled properly by the
      prioritization logic in
      
      arch/sparc{,64}/math-emu/math.c:record_exception().
      
      Based upon a report and test case from Jakub Jelinek.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      40584961
    • Ilpo Järvinen's avatar
      [POWERPC] Fix invalid semicolon after if statement · 2b02d139
      Ilpo Järvinen authored
      A similar fix to netfilter from Eric Dumazet inspired me to
      look around a bit by using some grep/sed stuff as looking for
      this kind of bugs seemed easy to automate.  This is one of them
      I found where it looks like this semicolon is not valid.
      Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
      Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      2b02d139
  3. 16 Aug, 2007 6 commits
  4. 15 Aug, 2007 22 commits