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

[dnt ly]

   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?





_________________________________________________________________
MSN ¬Ûï´£¨Ñ±z³Ì²³æªº¤è¦¡¤À¨É¨Ã¦C¦L±zªº¬Û¤ù¡A½Ð²¾¦Ü
http://photos.msn.com/support/worldwide.aspx¡C


-- 
Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss