[ECOS] ARM SDT2.51 vs arm-elf-gcc

[David Airlie]

arm-elf-gcc does produce crap ARM code, don't bother trying 3.0.4 I'll 
save you the bother it produces code the same level of crapiness as 2.95.3 
:-)

you might have a hope of getting the object linking using ADS the newer 
ARM stuff and gcc objects.. debugging would of course be impossible,

Dave.

On Thu, 11 Apr 2002, dnt ly wrote:

>        
>    I had a code which decode data, I compiled it using both 
> arm-elf-gcc(2.95/3.0) and ARM SDT2.51, and run it in test board, text 
> generated by ARM SDT2.51 is very fast than genereated by 
> arm-elf-gcc(2.95)(17.3 ms VS 70.2ms). I try the following simple code, and 
> get different asm code:
> 
>       int i = 1000000;
>       while(i--);
> 
> ARM SDT2.51:
> 	0xc12e38c: mov r0, #0x240
> 	0xc12e390: add r0, r0, #0xf4000
> 
> 	0xc12e394: subs r0, r0, #0x1
> 	0xc12e398: bcs 0xc12e394
> 
> arm-elf-gcc(2.95/3.0):
> 	0xc145c0c: ldr r2, 0xc145c48
> 
> 	0xc145c10: sub r2, r2, 0x1
> 	0xc145c14: cmn r2, 0x1
> 	0xc145c18: bne c145c10
> 
>        Is it that arm-elf-gcc(2.95) have not optimized full with ARM 
> instructions? anyone can help me or where can I get/buy arm-elf-gcc that 
> optimized full with ARM instructions?
> 
>       Or are there any way to compile eCos using  arm-elf-gcc, compile my 
> application using ARM SDT, link them together?
> 
> 
> 
> 
> 
> _________________________________________________________________
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> 
> 

-- 
      David Airlie, Software Engineer, Parthus Technologies plc.,
       Mary Rosse Centre, National Tech Park, Limerick, Ireland.
   t: +353-61-508116 / f: +353-61-508101 / David.Airlie@parthus.com


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