[LLVMdev] LLVM and Spec2006

[Jim Grosbach]

-O4 does give good additional performance compared to -O3 with llvm. The additional inlining opportunities and such add up quite a bit. The SPEC2006 runs I've done have all been within the framework of the llvm test suite, the LTO is run directly, rather than via an explicit -O4 option. The test-suite Makefiles themselves are probably the best place to look for the details of how that works if you're interested. SPEC2006 is hooked in via the Externals tests.

-Jim

On Jul 20, 2010, at 8:14 AM, Fariborz Jahanian wrote:

> Hi Reza,
> 
> -O4 is the highest level of LLVM optimization that I know of. But, I  
> don't know
> if it has been tried on Spec2006. IIRC, Dan Gohman has run Spec. tests  
> with LLVM,
> so he can provide more info.
> 
> - fariborz
> 
> On Jul 19, 2010, at 6:06 PM, Reza Yazdani wrote:
> 
>> Hi,
>> 
>> What are the best options to compile Spec2006 with LLVM compilers to  
>> get the best performance numbers on x86?
>> 
>> Has anybody compared LLVM Spec2006 numbers with GCC 4.5 base?
>> 
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