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

[Dmitry K.]

On Friday 25 January 2008 22:35, Wouter van Gulik wrote:
> __clzqi2:
>     clr     r_count     ; load with 0
>     com     r_count     ; invert (load with -1) + set carry
> __clzqi2_loop:
>     rol     r_arg1L         ; Rotate through carry
>     inc     r_count         ; Carry not touch by inc
>     brcc    __clzqi2_loop   ; Branch on no carry

That is splendid!

After a superficial view:
. A short rcall/rjmp is not safe with unknown (big) library
for intermodule link. Also a conditional branch.
. Are this function intended for math functions? If so,
the strong size optimization is not a best solution (IMHO).
An addition of few words may speed up in few times for
some 32/16-bit functions.

Regards,
Dmitry.