[MLton-devel] detecting overflow with the C codegen

[Henry Cejtin]

It is true that the long long code is pretty bad in gcc 2.96.  I don't have
a gcc 3.* around to test what it looks like there.  Still, I would think that
using the overflow flag would be the fastest when you get it.
Testing for overflow in C could be done by something like
	long long	tmp;

	tmp = x * y;		/* or x + y, ... */
	if (tmp != (int)tmp)
		--- overflow ---;
The generated code is probably bad but I would guess not too horrible and
the best you can get out of C.


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