Take:
int d;
int f(int a)
{
return d = (a-1)/2;
}
--- CUT ---
With -O2 -fdump-tree-final_cleanup, we get:
d.0 = a + -1 / 2;
This looks like we are missing the optimization of folding the constant -1/2
which is not true as this is really (a + -1) / 2 .
In 4.3.3 we get:
d.0 = (a + -1) / 2;
Which is correct.
--
Summary: [4.4 Regression] Missing parentheses for (a-1)/2 in
final_cleanup
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
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=38690
