[LLVMdev] LLVM and Spec2006
grosbach at apple.com
Tue Jul 20 09:03:37 PDT 2010
-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.
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:
>> 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?
>> reza _______________________________________________
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