Re: [avr-gcc-list] [FIX] _clz and friends not found (test builtin-bitops-1)

[Paulo Marques]

Wouter van Gulik wrote:
> Hi list,

Hi, Wouter

> I have been planning this fix of __clz a long time. I wanted to test it 
> against gcc testsuite which required fixing all of missing functions. So 
> I did the missing functions as well!

Nice job :)

> It will now pass the earlier failed testcase "builtin-bitops-1". There 
> is one small catch, you need to have avr-libc  (see makefile) since 
> avr-libc has a __ffsi implementation.

Ok.

> I tested the clzsi2 against all 4.2 billion cases :P It would have saved 
> me a half a day if avrtest was twice as fast :). I tested the rest 
> against the test case.

Great. Finally I have a good excuse to tweak the performance of avrtest ;)

> The whole file could also be optimized for size because loop functions 
> end with the same 3 instruction. Is such a trick allowed within the 
> library?

I don't know, but I wouldn't worry too much about 6 words of flash.

> The assembler is written so it should just be a copy paste into libgcc.s 
> in the avr tree of gcc, excluding the macro for movw. Then the "ADEFS" 
> list should be added to the list in the t-avr file and gcc rebuild. 
> Could anyone (Adrew, Paulo, Dmitry?) with a testsuite confirm this fix?

I'll try to follow these instructions and test it tonight. Thanks,

--
Paulo Marques
Software Development Department - Grupo PIE, S.A.
Phone: +351 252 290600, Fax: +351 252 290601
Web: www.grupopie.com

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