* [Bug optimization/12472] [tree-ssa] miscompiles stage-2's gengtype
2003-10-01 3:46 [Bug optimization/12472] New: [tree-ssa] miscompiles stage-2's gengtype pinskia at gcc dot gnu dot org
@ 2003-10-01 3:46 ` pinskia at gcc dot gnu dot org
2003-10-06 20:45 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-10-01 3:46 UTC (permalink / raw)
To: gcc-bugs
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pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |tree-ssa
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* [Bug optimization/12472] [tree-ssa] miscompiles stage-2's gengtype
2003-10-01 3:46 [Bug optimization/12472] New: [tree-ssa] miscompiles stage-2's gengtype pinskia at gcc dot gnu dot org
2003-10-01 3:46 ` [Bug optimization/12472] " pinskia at gcc dot gnu dot org
@ 2003-10-06 20:45 ` pinskia at gcc dot gnu dot org
2003-10-14 21:17 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-10-06 20:45 UTC (permalink / raw)
To: gcc-bugs
PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.
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pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dberlin at gcc dot gnu dot
| |org
------- Additional Comments From pinskia at gcc dot gnu dot org 2003-10-06 20:45 -------
*** Bug 12528 has been marked as a duplicate of this bug. ***
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* [Bug optimization/12472] [tree-ssa] miscompiles stage-2's gengtype
2003-10-01 3:46 [Bug optimization/12472] New: [tree-ssa] miscompiles stage-2's gengtype pinskia at gcc dot gnu dot org
2003-10-01 3:46 ` [Bug optimization/12472] " pinskia at gcc dot gnu dot org
2003-10-06 20:45 ` pinskia at gcc dot gnu dot org
@ 2003-10-14 21:17 ` pinskia at gcc dot gnu dot org
2003-10-15 0:09 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-10-14 21:17 UTC (permalink / raw)
To: gcc-bugs
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pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2003-10-14 21:17:27
date| |
------- Additional Comments From pinskia at gcc dot gnu dot org 2003-10-14 21:17 -------
If I disable all the RTL optimizers by editing opts.c and #if 0 out the code to turn them on, I get
passed this point.
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* [Bug optimization/12472] [tree-ssa] miscompiles stage-2's gengtype
2003-10-01 3:46 [Bug optimization/12472] New: [tree-ssa] miscompiles stage-2's gengtype pinskia at gcc dot gnu dot org
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2003-10-15 1:29 ` [Bug optimization/12472] [tree-ssa] [loop-optimize] " pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-10-15 0:09 UTC (permalink / raw)
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------- Additional Comments From pinskia at gcc dot gnu dot org 2003-10-15 00:09 -------
This is caused by one of the following two options:
flag_loop_optimize = 1;
flag_crossjumping = 1;
Both are RTL based optimizers, if I have some more time to work on this I will.
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* [Bug optimization/12472] [tree-ssa] [loop-optimize] miscompiles stage-2's gengtype
2003-10-01 3:46 [Bug optimization/12472] New: [tree-ssa] miscompiles stage-2's gengtype pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-10-15 1:29 UTC (permalink / raw)
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pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[tree-ssa] miscompiles |[tree-ssa] [loop-optimize]
|stage-2's gengtype |miscompiles stage-2's
| |gengtype
------- Additional Comments From pinskia at gcc dot gnu dot org 2003-10-15 01:29 -------
Okay I have narrowed it down to
flag_loop_optimize = 1;
Now I need to find out what it is doing to cause the miscompile.
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* [Bug optimization/12472] [tree-ssa] [loop-optimize] miscompiles stage-2's gengtype
2003-10-01 3:46 [Bug optimization/12472] New: [tree-ssa] miscompiles stage-2's gengtype pinskia at gcc dot gnu dot org
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2003-10-15 1:29 ` [Bug optimization/12472] [tree-ssa] [loop-optimize] " pinskia at gcc dot gnu dot org
@ 2003-10-15 2:33 ` pinskia at gcc dot gnu dot org
2003-10-15 3:32 ` [Bug optimization/12472] [tree-ssa] [doloop] " pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-10-15 2:33 UTC (permalink / raw)
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------- Additional Comments From pinskia at gcc dot gnu dot org 2003-10-15 02:33 -------
It is looking more like flag_branch_on_count_reg which is causing it.
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* [Bug optimization/12472] [tree-ssa] [doloop] miscompiles stage-2's gengtype
2003-10-01 3:46 [Bug optimization/12472] New: [tree-ssa] miscompiles stage-2's gengtype pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-10-15 3:32 UTC (permalink / raw)
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------- Additional Comments From pinskia at gcc dot gnu dot org 2003-10-15 03:32 -------
I have verified that it is flag_branch_on_count_reg which is causing it, I will look more at
it tomorrow.
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* [Bug optimization/12472] [tree-ssa] [doloop] miscompiles stage-2's gengtype
2003-10-01 3:46 [Bug optimization/12472] New: [tree-ssa] miscompiles stage-2's gengtype pinskia at gcc dot gnu dot org
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2003-10-15 3:32 ` [Bug optimization/12472] [tree-ssa] [doloop] " pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-10-16 0:36 UTC (permalink / raw)
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------- Additional Comments From pinskia at gcc dot gnu dot org 2003-10-16 00:36 -------
This is another RTL optimization problem after the doloop optimization is fixed.
It is caused by one of following options:
flag_optimize_sibling_calls = 1;
flag_cse_follow_jumps = 1;
flag_cse_skip_blocks = 1;
I am trying to narrow it down as I write this.
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* [Bug optimization/12472] [tree-ssa] [doloop] miscompiles stage-2's gengtype
2003-10-01 3:46 [Bug optimization/12472] New: [tree-ssa] miscompiles stage-2's gengtype pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-10-16 0:49 UTC (permalink / raw)
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------- Additional Comments From pinskia at gcc dot gnu dot org 2003-10-16 00:49 -------
Down to two:
flag_optimize_sibling_calls = 1;
flag_cse_skip_blocks = 1;
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* [Bug optimization/12472] [tree-ssa] [doloop] miscompiles stage-2's gengtype
2003-10-01 3:46 [Bug optimization/12472] New: [tree-ssa] miscompiles stage-2's gengtype pinskia at gcc dot gnu dot org
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2003-10-16 0:49 ` pinskia at gcc dot gnu dot org
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2003-11-04 5:25 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-10-16 2:16 UTC (permalink / raw)
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------- Additional Comments From pinskia at gcc dot gnu dot org 2003-10-16 02:16 -------
So the final two options which are causing the miscompile on powerpc-darwin are:
flag_optimize_sibling_calls = 1; (-foptimize-sibling-calls)
flag_branch_on_count_reg (-fbranch-on-count-reg)
Both are enabled at -O2.
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* [Bug optimization/12472] [tree-ssa] [doloop] miscompiles stage-2's gengtype
2003-10-01 3:46 [Bug optimization/12472] New: [tree-ssa] miscompiles stage-2's gengtype pinskia at gcc dot gnu dot org
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@ 2003-11-04 5:25 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-11-04 5:25 UTC (permalink / raw)
To: gcc-bugs
PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.
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pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2003-10-14 21:17:27 |2003-11-04 05:25:48
date| |
------- Additional Comments From pinskia at gcc dot gnu dot org 2003-11-04 05:25 -------
One more thing, the tree-ssa adds
addi r4,r4,-1 to the asm for some reason, other than that it is identical to the mainline.
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* [Bug optimization/12472] [tree-ssa] [doloop] miscompiles stage-2's gengtype
2003-10-01 3:46 [Bug optimization/12472] New: [tree-ssa] miscompiles stage-2's gengtype pinskia at gcc dot gnu dot org
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2003-11-04 5:25 ` pinskia at gcc dot gnu dot org
@ 2003-11-18 22:53 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-11-18 22:53 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2003-11-18 22:53 -------
What is cool is this patch is no longer needed so closing as fixed because it passes the spot where
the problem is.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12472
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