[avr-libc-dev] Re: [avr-libc-commit] avr-libc ./ChangeLog devtools/gen-avr-lib-tree.sh

[Anatoly Sokolov]

Hi.

> > Log message:
> > Set optimisation for building assembler sources files for 'avr3' and 
> > 'avr5' architectures to speed.
>
> Out of curiousity, what is the reason for this one?

In library some functions (memset, memcpy) have two versions , one are 
optimized on speed, another on the size.

memcpy.S:
.type _U(memcpy), @function
....
#if OPTIMIZE_SPEED
; 15 words, (14 + len * 6 - (len & 1)) cycles
.......
#else
; 11 words, (13 + len * 8) cycles
.......

I think we have lost this optimization when passed to new autotools.


Anatoly.