On Tue, Jul 30, 2002 at 01:19:10PM -0600, Tom Bradley wrote: > There are 2 main why you shouldn't use the 'float' or 'double' data > type inside of the kernel. > > - The kernel does not save the FPU registers, therefore the FPU is > always in an unknown state. Yes. :) (Well, I think I've heard that somewhere in the kernel, the FPU is used, but I can't recall where I heard that now. Unless anyone can confirm this, it might be best to forget it. :) > - Due to percision differences on different platforms the value of a > 'float' or 'double' can not be completely trusted to be the same. No; this would only be a problem for sharing float/double data among machines, and this problem is _very_ well known among floating point users, so it doesn't provide a compelling reason to not use floating point in the kernel. -- http://www.wirex.com/
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