cvs commit: src/sys/i386/include _types.h

[Bruce Evans]

On Wed, 5 Mar 2008, Mike Silbersack wrote:

> On Wed, 5 Mar 2008, Bruce Evans wrote:

>>  Change float_t and double_t to long double on i386.  All floating point
>
> For those of us who are not floating point experts, can you explain a few 
> things?

Other points replied to separately.

> As I've said in the past, I'd really, really, really like to see regression 
> tests for any change to the floating point functions.  The types of changes 
> you've been making are not easy to verify just by looking at diffs.

I run local regression tests of 4 billon to 64 billion cases per
function or 1.3 trillion cases for 125 functions a 36-hour run on a
2.2HGz UP system.  These are not well organized enough for commit.
You will have to trust that they are done before commit (or after on
some other machines) :-).  I mostly use semi-exhaustive (exhaustive
for 1-arg float precision functions) checks on machine-generated args.
This seems to find problems more routinely than smarter tests, up to
at least double precision.  das@ committed some smarter tests.

OTOH, I barely tested the changes to float_t and double_t.  These types
are so rarely used that they are never used in /usr/src, at least in
my old src tree, except for my uncommitted changes in libm parts.

Bruce