Hello list,
Question about an optimization feature: I have a program that is full of
conditional variable assignments like
if (swapped) x->a=bswap_32(a); else x->a=a;
if (swapped) x->b=bswap_32(b); else x->b=b;
if (swapped) x->c=bswap_32(c); else x->c=c;
...
(after inlining functions); I wonder if there is a way for the compiler to
make the obvious transformation into
if (swapped) {
x->a=bswap_32(a);
x->b=bswap_32(b);
...
} else {
x->a=a;
x->b=b;
...
}
which is way more efficient; I tried various gcc versions (2.95, 3.2 and
3.3), even Intel icc, and neither compiler appears to be capable of doing
that (btw icc is _really_ stupid when it comes to byte-swapping)
Am I stuck with rewriting the code or is there hope that this can be
optimized by the compiler?
Best regards
--
Helge Bahmann <hcb@xxxxxxxxxxxxxxx> /| \__
The past: Smart users in front of dumb terminals /_|____\
_/\ | __)
$ ./configure \\ \|__/__|
checking whether build environment is sane... yes \\/___/ |
checking for AIX... no (we already did this) |
