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[Bug c++/58717] [4.8 Regression] SCEV final value replacement no longer triggers
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 14 Oct 2013 07:05:03 +0000
- Subject: [Bug c++/58717] [4.8 Regression] SCEV final value replacement no longer triggers
- Auto-submitted: auto-generated
- References: <bug-58717-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58717
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-10-14
CC| |jakub at gcc dot gnu.org
Target Milestone|--- |4.8.2
Summary|Pre-calculation |[4.8 Regression] SCEV final
|optimization is omitted |value replacement no longer
| |triggers
Ever confirmed|0 |1
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
sccp pass used to optimize:
unsigned long long
foo ()
{
unsigned long long s = 0, i;
for (i = 0; i < 1000000000ULL; i++)
s += i;
return s;
}
before r194578, but no longer does in 4.8. In 4.9 this got fixed again, trying
to bisect now.