[LLVMdev] arm compiler benchmarks

[Reed Kotler]

What about benchmarks on other Arm devices?

On 02/26/2013 02:52 PM, Jim Grosbach wrote:
> Cortex-M0 is a Thumb1 only device. There hasn't been any concerted
> effort to tune LLVM's Thumb1 output in quite a long time. Even back then
> (2008 or so), the effort was mainly to get it to work acceptably, with
> the real performance tuning work being done for Thumb2. I'm not
> surprised that an embedded market focussed compiler like IAR is better
> tuned for a chip like that.
>
> -Jim
>
> On Feb 26, 2013, at 2:11 PM, matic at nimp.co.uk <mailto:matic at nimp.co.uk>
> wrote:
>
>> Hi,
>>
>>
>> I didn't do any serious benchmarking but so far I never found a case
>> where LLVM does better than IAR on CortexM0, but I saw a lot of cases
>> where IAR output is better than LLVM...
>>
>> That said I did not use -Os or -Oz, I just used -O3.
>>
>> A recurrent situation is that LLVM push/pop one or two extra registers
>> compared to IAR, I guess it does so in order to comply with a standard
>> ABI or something but in the world of deeply embedded system, we don't
>> care of such things 99.99% of the time...
>>
>> If you want to see some good code output, take a look at IAR, there is
>> a free version limited in code size online.
>>
>> Cheers,
>>
>> Sebastien
>>
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>
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