Yep, I remember trying the MXCSR thing once and it not working, but I
forget what processor it was on. If indeed it's equivalent to using this
gcc flag, I'm happier usin the compiler flag because it keeps the code
cleaner.
OTOH, it sounds like non-SSE processors will always need code to check things
manually.
cheers Miller
On Mon, Nov 03, 2008 at 10:25:55PM +0000, Tim Blechmann wrote:
Looking into this once again (I've had this problem for 10 years or more now) I just found out that gcc has a -ffast-math flag that prevents denormals for slowing the code down, as long as the CPU has SSE instructions. I don't know if the geode does or not, though!
according to wikipedia not all geode processors support sse instructions ... the sse unit can be configured to handle denormals as zero, by setting the MXCSR control register, no need to rely on specific compiler flags ... iirc, i added the specific code to the devel_0_37 a few years ago ...
tim
-- tim@klingt.org http://tim.klingt.org
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