Re: [Monotone-devel] illegal instruction

[Nathan Myers]

On Fri, Apr 02, 2004 at 11:06:38AM -0500, graydon hoare wrote:
> I'm looking into ways of making the activation of the SSE2 code "more 
> automatic". 

You really should be doing the test at runtime.  Generate the SSE2
code always (on x86 anyway), but only call into the variant that
uses it if you find that it is supported.  There's a neat trick in 
ELF ldso to make that happen automatically, but the codes are small 
enough (aren't they?) that you can afford to just link in all the 
variants (portable, SSE2, 3DNow!, Altivec) statically.  

Nathan Myers
address@hidden