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From: Ilija Kocho <ilijak@siva.com.mk>
To: ecos-devel@ecos.sourceware.org
Subject: Re: Gnutools: consideration for upgrade to GCC 4.6
Date: Fri, 13 Jan 2012 19:39:00 -0000	[thread overview]
Message-ID: <4F108853.4070903@siva.com.mk> (raw)
In-Reply-To: <4F107DE4.7080706@kuantic.com>

On 13.01.2012 19:54, Bernard Fouché wrote:
>
> 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 haven't changed any option except -mcpu=cortex-m4. My objective were 
SIMD instructions (now with K70 FPU).

> 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.

Worth to try.

Ilija

  reply	other threads:[~2012-01-13 19:39 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-01-13 17:01 Ilija Kocho
2012-01-13 18:54 ` Bernard Fouché
2012-01-13 19:39   ` Ilija Kocho [this message]
2012-01-13 19:09 ` Frank Pagliughi
2012-01-13 19:45   ` Ilija Kocho
2012-01-14 10:22 ` John Dallaway
2012-01-14 16:02   ` Sergei Gavrikov
2012-01-15 17:36     ` Grant Edwards
2012-01-15 18:42       ` Sergei Gavrikov
2012-01-15 21:39         ` Stanislav Meduna
2012-01-23  1:01           ` Jonathan Larmour
2012-01-15 22:21         ` Ilija Kocho
2012-01-23  1:07           ` Jonathan Larmour
2012-01-15 22:21         ` Ilija Kocho
2012-01-16 15:20         ` Grant Edwards
2012-01-16 20:43           ` Sergei Gavrikov
2012-01-16 21:11             ` Sergei Gavrikov
2012-01-17  9:58               ` Bernard Fouché
2012-01-17 10:38                 ` Paul Beskeen
2012-01-17 12:28                   ` Sergei Gavrikov
2012-01-23  0:59     ` Jonathan Larmour
2012-01-14 16:25   ` Ilija Kocho
2012-01-23  1:13     ` Jonathan Larmour
2012-01-23 18:40       ` Ilija Kocho
2012-01-23 19:29         ` Jonathan Larmour
2012-01-25 12:30         ` Alex Schuilenburg
2012-01-25 20:59           ` Ilija Kocho
2012-01-26 13:36             ` Alex Schuilenburg
2012-01-26 20:18               ` Ilija Kocho
2012-02-13 22:02           ` eCos GNU tools 4.6.2-20120125 ready for testing [Was Re: Gnutools: consideration for upgrade to GCC 4.6] Ilija Kocho
2012-02-20 16:00             ` Alex Schuilenburg
2012-02-20 20:45               ` Ilija Kocho
2012-03-02 16:36             ` Alex Schuilenburg
2012-03-03 13:32               ` Ilija Kocho
2012-03-04  0:10                 ` Alex Schuilenburg
2012-03-04 17:49                   ` Sergei Gavrikov
2012-03-04 23:08                     ` Alex Schuilenburg
2012-03-04 19:37                   ` eCos GNU tools 4.6.2-20120125 ready for testing John Dallaway
2012-03-04 23:47                     ` Alex Schuilenburg
2012-03-05  8:00                       ` Sergei Gavrikov
2012-03-07 13:51                         ` Sergei Gavrikov
2012-03-07 11:58                       ` Alex Schuilenburg
2012-03-07 13:01                         ` Ilija Kocho
2012-03-07 13:39                           ` Sergei Gavrikov
2012-03-07 13:13                         ` John Dallaway
2012-03-12 16:43                           ` Alex Schuilenburg
2012-03-16 15:05                             ` Alex Schuilenburg
2012-03-08 17:28                         ` Alex Schuilenburg
2012-03-09  9:39                           ` Ilija Kocho
2012-03-09 17:15                             ` Alex Schuilenburg
2012-03-10 17:16                           ` John Dallaway
2012-03-12 16:12                             ` Alex Schuilenburg
2012-03-13 13:31                               ` Alex Schuilenburg
2012-03-13 14:16                                 ` Ilija Kocho
2012-03-13 17:47                                   ` Sergei Gavrikov
2012-03-15  8:50                                     ` John Dallaway
2012-03-17 14:50                                       ` Sergei Gavrikov
2012-03-17 20:58                                         ` John Dallaway
2012-03-17 16:44                                       ` Stanislav Meduna
2012-03-18 19:10                                   ` eCos GNU tools 4.6.3-20120315 [Was Re: eCos GNU tools 4.6.2-20120125 ready for testing] Ilija Kocho
2012-04-04 12:57                                     ` Lambrecht Jürgen
2012-04-04 13:18                                       ` Ilija Kocho
2012-05-31  8:42                                         ` eCos GNU tools 4.6.3-20120315 and link time optimization Bernard Fouché
2012-03-05  8:30                     ` eCos GNU tools 4.6.2-20120125 ready for testing Tomas Frydrych
2012-03-05  8:56                       ` Tomas Frydrych
2012-03-05  9:50                         ` John Dallaway
2012-03-05  9:55                           ` Anders Montonen
2012-03-05 14:20                             ` John Dallaway
2012-03-05 10:16                           ` Ilija Kocho
2012-03-05 12:56                             ` Tomas Frydrych
2012-03-03 12:58             ` eCos GNU tools 4.6.2-20120125 ready for testing [Was Re: Gnutools: consideration for upgrade to GCC 4.6] Sergei Gavrikov
2012-01-17  9:37 ` Gnutools: consideration for upgrade to GCC 4.6 Tomas Frydrych
2012-01-17 16:10   ` Stanislav Meduna
2012-01-17 16:25     ` Tomas Frydrych
2012-01-17 16:45     ` Ilija Kocho
2012-01-20 14:42       ` Frank Pagliughi

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