Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations

[charfi asma]

hello,

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 ?

thank you very much

Asma