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Re: Gnutools: consideration for upgrade to GCC 4.6
- From: Bernard Fouché <bernard dot fouche at kuantic dot com>
- To: ecos-devel at ecos dot sourceware dot org
- Date: Fri, 13 Jan 2012 19:54:28 +0100
- Subject: Re: Gnutools: consideration for upgrade to GCC 4.6
- References: <4F106345.4080902@siva.com.mk>
Le 13/01/2012 18:00, Ilija Kocho a écrit :
Our GCC 4.3.2 is ageing and perhaps we should consider an upgrade.
My motive is it's lacking of support for Cortex-M4 SIMD (aka DSP) and
FPU instructions, but I think that other architectures shall gain from
newer compiler too. I have made some signal processing tests with GCC
4.6.2 against current eCos compiler and they show performance gain
even with Cortex-M3 setting, though moderate. Performance is
considerable when Cortex-M4 setting is selected and is tremendous, as
expected, when SIMD are used. Recently introduced Cortex-M products
with FPU (Kinetis K70, K61, STM32F4) will further emphasise the benefit.
That sounds good! Did you try link time optimization ? I'm curious what
kind of gain it could bring with a real world app. eCos seems to fit
perfectly for such an optimization, there is no shared lib and at link
time everythink is visible to the linker.