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[Bug target/50182] Performance degradation from gcc 4.1 (x86_64)
- From: "xinliangli at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 21 Oct 2011 23:02:16 +0000
- Subject: [Bug target/50182] Performance degradation from gcc 4.1 (x86_64)
- Auto-submitted: auto-generated
- References: <bug-50182-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50182
--- Comment #15 from davidxl <xinliangli at gmail dot com> 2011-10-21 23:02:16 UTC ---
(In reply to comment #14)
> (In reply to comment #13)
> > David, it looks like we are seeing different things with v4.7... See my
> > comment 11 - I am still observing the slowdown. Do you have access to
> > v4.1 and v4.6? Could you try reproducing my test please?
>
> Sorry for the delay -- I am pretty swamped these days (till mid October). I
> will try to look at the problem more then.
>
> David
I still can not reproduce the problem with trunk compiler:
rv=4282167296
test description absolute operations ratio with
number time per second test0
0 "int8_t constant add" 1.09 sec 1467.89 M 1.00
Total absolute time for int8_t constant folding: 1.09 sec
Can you attach the output of -v and the assembly file with -fverbose-asm -dA
and the optimized dump file with option -fdump-tree-optimized-blocks using
trunk compiler?
thanks,
David