matherr() must not fake an FP exception

When FP exceptions are used, matherr() forces a fake FP exception,
which is interpreted as an error by the checking code after a math
routine call.  This is wrong for several reasons:

- it's not necessary for error checking: when FP exceptions aren't
  used, matherr() is a stub and no information is derived from it
  being called

- it's not necessary for FPU maintenance: the FPU only needs to be
  reprogrammed after an actual FP exception

- it causes false negatives: matherr() may be called even though
  Erlang doesn't consider the case to be an error (exp() and pow()
  underflows on Solaris for instance); with FP exceptions enabled
  they are incorrectly considered errors

The fix is to remove all FP exception related code from matherr().

0 files changed, 0 insertions, 0 deletions