Opinions about AVR32 for Voice Recorder?

Everything I've read indicated that the core was not based on a core from ARM. It was designed from-scratch by DEC.

I think that TI also did an ARM core from scratch as well, but I'm not as confident that it wasn't something based on a core they got from ARM.

You all seem to forget that the function of a compiler is to understand the input language. This part of gcc is constant for any language. What actually varies, for different object machines, is the machine code generator. This, again, is constant for a particular object machine, because the compiler proper prepares an independent, known, expression of the required code. This has very little relation to final output code.

It is this separation that has made gcc extremely flexible and applicable to a broad range of languages and machines.

Fair enough. I wonder why they never did more with it.

I took a look at it. The main issue I have is cost. They seem to be much more expensive than competing products. Or am I misreading that?

There is also a mid-end which does optimizations in a language and machine independent way.

The machine description maps the intermediate code to the final code. For many architectures, but especially RISCs, this is close to a one to one mapping.

Of course. But there is a tradeoff between easy retargetability and producing efficient code, and GCC is geared towards the former.

Wilco

"Wilco Dijkstra" skrev i meddelandet news:X0tfj.23372$ snipped-for-privacy@newsfe7-gui.ntli.net...

It is actually very simple to test this and the AVR32 compiler generates code which gives about 1,2-1,3 MIPS/MHz on an AVR32 uC3C. The lower number at 66 Mhz with 1 waitstate and the higher number at lower frequencies without waitstate.

I have seen some 6 months old figures for Cortex/Thumb-2 saying less than 1 MIPS/MHz using gcc. It does considerably better with the ARM Realview.

Is there any update to that?

Think the Atmel tool team is pretty motivated to improve gcc for AVR32 ;-) ARM may be less interested to improve Thumb-2 support, since it competes with Realview, but I really do not know. Who will make money fixing gcc Thumb-2?

Libraries are C code, and you can use any library.

Actually Dhrystone is absolutely the worst possible test to show compiler quality. It's always fun to explain to people excited by great Dhrystone scores that much of the time is spent in a few library functions. So for a great Dhrystone score, all you need is a good assembly programmer for a week. Then you can go and show the world how efficient your compiler is in calling highly optimized assembler routines!

Sales people are known to forget to mention that last bit...

I wrote some highly optimised ARM libraries that will get GCC's score close to RealView, but I'm obviously selling those rather than making them open source. The standard libraries (eg. newlib) are not worth bothering with if you want a good Dhrystone score.

I wouldn't consider GCC to be competing but I wish you good luck fixing all the problems in GCC.

Wilco

For a voice recorder to get a practical device, good rumble filtering and automatic gain controle are much higher on the priority list than a high resolution. Indeed controllers mostly have 10 or 12 bits because more is not practical in the environment. So I wonder whether the OP hopes (thinks) that quality comes automatically with a good resolution.

Groetjes Albert

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