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

[Wouter van Gulik]

Hi list,

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!
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.
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.

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?

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?

Wouter

Note: that this also fixes the "too much ram by clz" and (AFAIK) an 
unreported "too much ram"  for popcount.

clz.zip
Description: Binary data