On Fri, 17 Dec 1999, Pascal Hofstee wrote:
> On Sat, 18 Dec 1999, Bruce Evans wrote:
>
> > 0301 is an old (bad) way of spelling
> > MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS. Cygnus finally fixed it in
> > in gcc/config/i386/freebsd.h on 1999/03/23 (see the ChangeLog), but FreeBSD
> > hasn't merged the change.
>
> Thanks ... I do have on eother question though ... does this mean that
> FreeBSD by default compiles with the -mieee-fp compile switch. As that is
Yes.
> the solution (for SIGFPE issues) suggested by some Mozilla people on
> Bugzilla.
Very unlikely. -mieee-fp just fixes comparisons of Quiet NaNs with 0, at
a small cost in efficiency. As a side effect, this prevents SIGFPEs for
comparisons of Quiet NaNs with 0 when the invalid-operand exception is
not masked, but if you have a Quiet NaN, then you are probably running
with invalid-operand exceptions masked and wouldn't be worried about
SIGFPEs. Quiet NaNs are normally generated by invalid operations, e.g.,
0.0/0.0 when the invalid-operand exception is masked. If this exception
is unmasked, then 0.0/0.0 generates a SIGFPE and leaves the operands on
the FPU stack.
Bruce
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