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[Bug middle-end/23401] New: Gimplifier produces too many temporaries
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 15 Aug 2005 15:08:41 -0000
- Subject: [Bug middle-end/23401] New: Gimplifier produces too many temporaries
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
Take the following code:
struct f
{
struct {
int i;
} ff[10];
};
struct f g;
int ffff(int i)
{
int t1 = 0;
int i1 = g.ff[t1].i;
int i2 = g.ff[i].i;
return i1 + i2;
}
The gimplfiier will produce at -O0:
int i.0;
int t1.1;
int D.1289;
int t1;
int i1;
int i2;
t1 = 0;
i.0 = i;
i1 = g.ff[i.0].i;
t1.1 = t1;
i2 = g.ff[t1.1].i;
D.1289 = i1 + i2;
return D.1289;
Notice how there is a t1.0 and i.0, there should not be there as i and t1 are already gimple variables.
This might produce a nice speed up for some testcase but I don't know. at -O0, there will be less
registers to be allocated so reload should not be as high as before.
--
Summary: Gimplifier produces too many temporaries
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: minor
Priority: P2
Component: middle-end
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=23401