Re: MERGE: fix subnormal test on AMD64 (2nd attempt)

[Tim Janik <tim janik lanedo com>]

Hi Stefan.

This change aparently caused a regression on MIPS, please
see this bug report:
	https://bugzilla.gnome.org/show_bug.cgi?id=649669

On Sun, 9 Jan 2011, Stefan Westerfeld wrote:

>   Hi!
>
> Since on AMD64, denormals are treated as zero (a feature of SSE math), the
> subnormals test breaks. My previous merge request was not accepted, because it
> didn't check the CPU status registers, but just assumed that if a certain
> calculation resulted in 0, CPU would be in DAZ mode.
>
> So in my new attempt to fix this, I check the CPU status registers. I also
> check if the SSE unit is actually used for floating point math by checking
> x86_64 and FLT_EVAL_METHOD defines.
>
> repo:   http://space.twc.de/public/git/stwbeast.git
> branch: subnormals2-amd64
>
>   Cu... Stefan
> --
> Stefan Westerfeld, Hamburg/Germany, http://space.twc.de/~stefan
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Yours sincerely,
Tim Janik

---
http://lanedo.com/~timj/ - Founder and CEO of Lanedo GmbH.
Free software author and contributor on various projects.