http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46027
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> 2010-10-19
00:29:18 UTC ---
Here is a full testcase:
typedef unsigned type1;
typedef unsigned char type2;
type1 t;
void f(type1 tt)
{
type2 t1 = t;
type1 t2 = t1;
t = t2 & 0xFF;
}
void f2(type1 tt)
{
type1 t2 = (type2)t;
t = t2 & 0xFF;
}
void f1(type1 tt)
{
type1 t2 = t & 0xff;
t = t2 & 0xFF;
}
---- CUT ----
Currently f does not get optimized after my patch. f1 is optimized before my
patch and f2 is optimized afterwards. f requires some kind of forward
prop/tree combining to do the work.
