Take:
struct f{
float a;
float b;
float c;
float d;
};
struct f a;
void h(float, float, float, float);
void g(void)
{
float a1 = a.a, b = a.b, c = a.c, d = a.d;
a.a = a1;
a.b = b;
a.c = c;
a.d = d;
h(a1, b, c, d);
}
--- CUT ---
Currently only postreload will remove the store back to a.a, a.b, a.c, and a.d.
Note this code orginally came from inlined code and was just reduced to this.
And if this was done before postreload, we don't need a fmr which was produced
by the register allocator.
--
Summary: Only postreload will remove a no-op store
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38513
