Brandon S. Allbery KF8NH
allbery at ece.cmu.edu
Mon Jun 16 21:53:32 EDT 2008
On 2008 Jun 16, at 19:18, David Roundy wrote:
> On Mon, Jun 16, 2008 at 4:07 PM, Evan Laforge <qdunkan at gmail.com>
>> Every other language throws an exception, even C will crash the
>> program, so I'm guessing it's telling the processor / OS to turn
>> into signals, while GHC is turning that off. Or something. But then
>> what about this note in Control.Exception:
> That's just not true. It depends on how your system (compiler?) is
> configured, but the default on most systems that I've used is to
> return NaNs.
It's how the system FPU is configured; most FPU hardware on Unixlike
systems let you configure the FPU behavior on a per-process basis,
although the amount of configurability may vary.
That said, the divide by zero exception you get in both C and Haskell
is *integer* divide-by-zero. Floating is mandated by IEEE standard to
produce Inf (but as said above, can usually be configured).
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university KF8NH
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