[MLton] ARM and setRoundingMode

[Adam Goode]

Hi,

I am bootstrapping MLton for Fedora ARM. Everything seems to be
working well, but the target hardware is software floating point,
which on ARM doesn't implement non-default IEEE rounding modes.

According to
 http://www.standardml.org/Basis/ieee-float.html#SIG:IEEE_REAL.setRoundingMode:VAL
if the hardware doesn't support a rounding mode, setRoundingMode
could raise an exception for unsupported modes. This is detectable
when fesetround returns a non-zero value.

Should MLton do this? What exception should be used? It would
be nice to know when setRoundingMode fails.



Thanks,

Adam

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