[LLVMdev] FYI: Phoronix GCC vs. LLVM-GCC benchmarks

罗勇刚(Yonggang Luo) luoyonggang at gmail.com
Tue Sep 15 09:28:07 PDT 2009

Wow, that's beautiful: and thanks

2009/9/15, David Greene <dag at cray.com>:
> On Tuesday 15 September 2009 08:16, Olivier Meurant wrote:
>> llvm-gcc -v
>> Using built-in specs.
>> Target: i686-pc-linux-gnu
>> gcc -v
>> Using built-in specs.
>> Target: i486-linux-gnu
> Different targets.  It's no surprise 486 code would perform much worse than
> i686 code.  These compilers need to target the same architecture.  Ideally
> the
> Makefile would include appropriate -march/-mtune/whatever the gcc
> architecture
> switch of the day is.
> All test reports should also include switches passed to the compiler for
> each
> run.
> Right now this isn't a fair test.  It's practically meaningless.
> Remember, the goal here isn't to show how great LLVM is.  It's to get an
> honest assessment of where we are at.  Phoronix did us a big favor.  Getting
> more details about his tests would help us even more.
> For one thing, we (Cray) have a number of LLVM enhancements geared toward
> Opteron that make a big difference in performance.  I'm planning to
> contribute
> much of this to our open source community.  So there is definitely room for
> improvement to LLVM.  The biggest mistake we can make is to think we're the
> best.
>                                  -Dave
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Yonggang Luo

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