Floating point trouble with x86's extended precision

[Zack Weinberg]

Bradley Lucier <lucier@math.purdue.edu> writes:

> And this is just about the end of the story.  I, and at least some
> other people, think that GCC should include at least one model of
> floating-point arithmetic for the x86 that allows one to deduce the
> types and precisions of all variables, operations, etc., by examining
> the source code.  It does not (and it probably will not for the
> foreseeable future).  Telling people that not having a predictable
> model of what their program will do is a feature, not a bug, doesn't
> cut it.

-mfpmath=sse, with a pentium 4.  Except i think that for abi
compatibility it still puts function return values in %st(0), which
could potentially cause problems.

zw