sion: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gcov/profile
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: steinmtz at us dot ibm dot com
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: powe
--- Additional Comments From steinmtz at us dot ibm dot com 2005-09-26
19:57 ---
Created an attachment (id=9809)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9809&action=view)
dwarf2out.gcda
Attached dwarf2out.gcda
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24069
--- Additional Comments From steinmtz at us dot ibm dot com 2005-09-26
19:58 ---
Created an attachment (id=9810)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9810&action=view)
dwarf2out.gcno
Attached dwarf2out.gcno
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24069
--- Additional Comments From steinmtz at us dot ibm dot com 2005-09-26
20:14 ---
When I first saw it, it was with "stage1/xgcc -B stage1", however I've since
done a non-profiled bootstrap of mainline, and the resulting gcc exhibits the
same problem.
Working on getting
--- Additional Comments From steinmtz at us dot ibm dot com 2005-09-26
20:28 ---
Until I attach a .i file, this could be reproduced by anyone with a copy of
the mainline source and the gcda/gcno attachments I've already provided.
You'd need to to something like this:
...
--- Additional Comments From steinmtz at us dot ibm dot com 2005-09-26
21:49 ---
Created an attachment (id=9811)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9811&action=view)
dwarf2out.i
Here's the .i. It results in a little "noise" in the form of so
--- Additional Comments From steinmtz at us dot ibm dot com 2005-09-26
22:07 ---
Unless the common infrastructure bb frequency and edge probabilities have been
updated to reflect builtin_expect, http://gcc.gnu.org/ml/gcc-patches/2005-
09/msg00370.html probably won't fix this pr
--- Additional Comments From steinmtz at us dot ibm dot com 2005-09-27
15:06 ---
Problem goes away if the -freorder-blocks-and-partition option is removed.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24069
--- Additional Comments From steinmtz at us dot ibm dot com 2005-09-27
20:05 ---
Created an attachment (id=9822)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9822&action=view)
Smaller dwarf2out.i
Attached a smaller .i file. Any further reduction causes profile data
mis
--- Additional Comments From steinmtz at us dot ibm dot com 2005-09-29
04:36 ---
./> gcc -v
Using built-in specs.
Target: powerpc64-linux
Configured with: /home/steinmtz/work/src/mainline/gcc/configure --
prefix=/home/steinmtz/work/install/mainline --build=powerpc64-linux --
h
--- Additional Comments From steinmtz at us dot ibm dot com 2005-09-29
19:26 ---
Here's the backtrace:
#0 make_edges (min=0x402ebe70, max=0x4070edd0, update_p=1)
at /home/steinmtz/work/src/mainline/gcc/gcc/cfgbuild.c:350
#1 0x1048d144 in find_many_sub_basic_blocks (blocks=0x0
--- Additional Comments From steinmtz at us dot ibm dot com 2005-09-30
17:47 ---
Here's the offending jump:
(jump_insn:HI 2539 2830 2305 120 (set (pc)
(reg:SI 66 ctr [ targetm.asm_out.unwind_label ])) 504
{*indirect_jumpsi} (insn_list:REG_DEP_TRUE 2537 (insn_list:REG_DEP
--- Additional Comments From steinmtz at us dot ibm dot com 2005-09-30
20:16 ---
Created an attachment (id=9849)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9849&action=view)
Dump from -fdump-rtl-expand-all
Output from -fdump-rtl-expand-all attached as requested.
Note t
at us dot ibm dot com
GCC host triplet: powerpc64-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24408
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: steinmtz at us dot ibm dot com
CC: gcc-bugs at gcc dot gnu dot org,steinmtz at us dot ibm
dot com
--- Additional Comments From steinmtz at us dot ibm dot com 2004-10-08 16:28
---
It appears that the specific problem documented here has been resolved in
mainline. There is still a performance regression when using FDO, however,
but it must be for other reasons.
Marking this one as
--- Additional Comments From steinmtz at us dot ibm dot com 2004-11-22
22:27 ---
I rechecked this one with a version of mainline built today (11/22/04) and the
problem still appears.
--
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