charfi asma <charfiasma@xxxxxxxx> writes:
> If GCC could optimize this code
>
>
> if (x=1)
> {
> a=b;
> c=d;
> e=f;
> foo();
>
> }
> if (x=2)
> {
> a=b;
> c=d;
> e=f;
> foo();
> }
>
>
> to this one
>
>
> if (x=1) || (x=2)
> {
> a=b;
> c=d;
> e=f;
> foo();
> }
>
> it will be implemented in which optimizations ? pre: partiel redundent elimination optimizaion or another one may be code motion ?
I don't think gcc can do that optimization today. There used be an
optimization -frtl-abstract-sequences which was vaguely similar, but it
didn't work well and was removed. If this were to be implemented, it
would not be any of the existing optimizations; it would be something
different.
Ian
