[LLVMdev] Changing target features from C++

[Chris Lattner]

On Jul 18, 2008, at 8:42 AM, Nicolas Capens wrote:

> Hi all,
>
> How do I properly/conveniently change ISA features of the code to be  
> generated? For instance I have a Core 2 Duo with SSSE3 but I’d also  
> like to test whether everything would JIT compile correctly on  
> something with just SSE2 (a Pentium 4) or even older. In other  
> words, how do I prevent LLVM from using certain target features?
>

The JIT defaults to using whatever it can.  You can hack  
X86Subtarget::AutoDetectSubtargetFeatures() to disable specific  
features.

-Chris
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