Dear Joakim Tjernlund,
In message
<of26fea2cb.36e102ee-onc1257649.0031301d-c1257649.0031e...@transmode.se> you
wrote:
>
> > How about:
> >
> > cl = 0;
> > for (i=0; i<sizeof(long); ++i) {
> > cl <<= 8;
> > cl |= c & 0xff;
> > }
> >
> > GCC optimization will do the rest...
>
> If you want gcc to optimise well, make it easy to do so.
> Changing the for loop into:
> for (i=sizeof(long); i; --i)
> makes it easier for gcc and more likely to result in optimal code.
Did you actually _check_ the code? (I did).
It does not matter. The generated code is identical.
What matters might be compiler options - "-Os" generates a small loop,
and "-O3" and higher will unroll the loop, which is way more code.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
When you die, the first thing you lose is your life. The next thing
is the illusions. - Terry Pratchett, _Pyramids_
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