Igor Podlesny wrote:

2008/11/22 H. Peter Anvin [off-list ref]:
[...]

quoted

It sort of makes sense that -Os would break this stuff.  For newer gccs,
it would be better to use SSE2 intrinsics rather than inline assembly.
The problem is that it breaks older gcc.

	Well, #ifdef could be helpful then, couldn't it? :-)

Yes, and that's probably the way to go.

I just tested a version using gcc intrinsics with gcc 4.3, and it is
almost 20% faster than the inline assembly version.  That, plus the fact
that the code is actually readable, makes me really want to figure out
how best to deploy this.

	-hpa