Take following code:
int g(void);
int h(void)
{
int i = g();
return 9;
}
int h1(void)
{
g();
return 9;
}
----
In h(), we could remove the assignment to i and this helps out a little in
compile time when expanding
to RTL. DCE could be doing this but does not. I thought about this issue when
I was working on my
quick and dirty DCE.
--
Summary: Not removing a SSA_NAME which is not used
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Keywords: compile-time-hog
Severity: enhancement
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23834
