* [Bug target/27707] g++.dg/tree-ssa/ivopts-1.C fails
2006-05-21 16:44 [Bug target/27707] New: g++.dg/tree-ssa/ivopts-1.C fails jsm28 at gcc dot gnu dot org
@ 2006-05-22 9:10 ` rguenth at gcc dot gnu dot org
2006-05-22 9:21 ` [Bug testsuite/27707] " rguenth at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-05-22 9:10 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from rguenth at gcc dot gnu dot org 2006-05-22 09:05 -------
Mine. I'll add an XFAIL as for x86_64/i?86 - looks like hppa is another target
with weird costs.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |rguenth at gcc dot gnu dot
|dot org |org
Status|UNCONFIRMED |ASSIGNED
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2006-05-22 09:05:49
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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2006-05-22 9:10 ` [Bug target/27707] " rguenth at gcc dot gnu dot org
@ 2006-05-22 9:21 ` rguenth at gcc dot gnu dot org
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To: gcc-bugs
------- Comment #2 from rguenth at gcc dot gnu dot org 2006-05-22 09:20 -------
Fixed.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|target |testsuite
Target Milestone|--- |4.2.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
^ permalink raw reply [flat|nested] 19+ messages in thread* [Bug testsuite/27707] g++.dg/tree-ssa/ivopts-1.C fails
2006-05-21 16:44 [Bug target/27707] New: g++.dg/tree-ssa/ivopts-1.C fails jsm28 at gcc dot gnu dot org
2006-05-22 9:10 ` [Bug target/27707] " rguenth at gcc dot gnu dot org
2006-05-22 9:21 ` [Bug testsuite/27707] " rguenth at gcc dot gnu dot org
@ 2006-05-22 9:22 ` rguenth at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-05-22 9:22 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from rguenth at gcc dot gnu dot org 2006-05-22 09:21 -------
Subject: Bug 27707
Author: rguenth
Date: Mon May 22 09:20:46 2006
New Revision: 113972
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=113972
Log:
2006-05-22 Richard Guenther <rguenther@suse.de>
PR testsuite/27707
* g++.dg/tree-ssa/ivopts-1.C: XFAIL for hppa*-*-*.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/tree-ssa/ivopts-1.C
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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To: gcc-bugs
------- Comment #4 from rguenth at gcc dot gnu dot org 2006-06-09 10:24 -------
Fixed.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
^ permalink raw reply [flat|nested] 19+ messages in thread* [Bug testsuite/27707] g++.dg/tree-ssa/ivopts-1.C fails
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From: danglin at gcc dot gnu dot org @ 2006-09-09 18:25 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from danglin at gcc dot gnu dot org 2006-09-09 18:25 -------
I would like to request that this bug to be reopened.
First, the test never failed on hppa*-*-linux*, so we now have two
XPASS's on this target. Second, between 15 and 17 August, the second
xfail for hppa*-*-* changed to an XPASS on hppa*-*-hpux*. Third,
there's no PR for the "-4B" offset that's still present on hppa*-*-hpux*.
PR 26726, which added the testcase, points to PR target/24669 as
the remaining issue for that issue. This is characterized as being
a target specific problem, namely that the a more complicated addressing
mode is cheaper than a simpler mode, leading ivopts to prefer the it.
The puzzle in my mind is that there is no obvious difference between
costs for hpux and linux in the PA backend.
--
danglin at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |danglin at gcc dot gnu dot
| |org
Status|RESOLVED |REOPENED
Resolution|FIXED |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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From: rguenth at gcc dot gnu dot org @ 2006-09-09 18:34 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from rguenth at gcc dot gnu dot org 2006-09-09 18:34 -------
I don't know what should be the difference between hpux and linux PA, though
this is an issue of IVOPTs and rtl costs.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu dot
| |org
AssignedTo|rguenth at gcc dot gnu dot |unassigned at gcc dot gnu
|org |dot org
Status|REOPENED |NEW
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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From: dave at hiauly1 dot hia dot nrc dot ca @ 2006-09-09 18:45 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from dave at hiauly1 dot hia dot nrc dot ca 2006-09-09 18:45 -------
Subject: Re: g++.dg/tree-ssa/ivopts-1.C fails
> I don't know what should be the difference between hpux and linux PA, though
> this is an issue of IVOPTs and rtl costs.
I've the dump files for hppa-unknown-linux-gnu and hppa2.0w-hp-hpux11.11.
Dave
------- Comment #8 from dave at hiauly1 dot hia dot nrc dot ca 2006-09-09 18:45 -------
Created an attachment (id=12213)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=12213&action=view)
------- Comment #9 from dave at hiauly1 dot hia dot nrc dot ca 2006-09-09 18:45 -------
Created an attachment (id=12214)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=12214&action=view)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
^ permalink raw reply [flat|nested] 19+ messages in thread* [Bug testsuite/27707] g++.dg/tree-ssa/ivopts-1.C fails
2006-05-21 16:44 [Bug target/27707] New: g++.dg/tree-ssa/ivopts-1.C fails jsm28 at gcc dot gnu dot org
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From: rguenther at suse dot de @ 2006-09-09 20:38 UTC (permalink / raw)
To: gcc-bugs
------- Comment #10 from rguenther at suse dot de 2006-09-09 20:37 -------
Subject: Re: g++.dg/tree-ssa/ivopts-1.C fails
On Sat, 9 Sep 2006, dave at hiauly1 dot hia dot nrc dot ca wrote:
> ------- Comment #7 from dave at hiauly1 dot hia dot nrc dot ca 2006-09-09 18:45 -------
> Subject: Re: g++.dg/tree-ssa/ivopts-1.C fails
>
> > I don't know what should be the difference between hpux and linux PA, though
> > this is an issue of IVOPTs and rtl costs.
>
> I've the dump files for hppa-unknown-linux-gnu and hppa2.0w-hp-hpux11.11.
It confirms that it is the same problem as on i?86, but it doesn't tell
why. I don't see an obvious difference in config/pa/
Richard.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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From: dave at hiauly1 dot hia dot nrc dot ca @ 2006-09-10 0:02 UTC (permalink / raw)
To: gcc-bugs
------- Comment #11 from dave at hiauly1 dot hia dot nrc dot ca 2006-09-10 00:02 -------
Subject: Re: g++.dg/tree-ssa/ivopts-1.C fails
> It confirms that it is the same problem as on i?86, but it doesn't tell
> why. I don't see an obvious difference in config/pa/
Yes, it does seem to be the same problem. The hpux assembler
output has a -4 offset:
stw %r2,-20(%r30)
L$CFI0000
ldi 1,%r19
ldo 128(%r30),%r30
L$CFI0001
ldo -116(%r30),%r28
ldo -100(%r30),%r20
stw %r19,-4(%r28)
L$0008:
ldo 4(%r28),%r28
comb,<>,n %r20,%r28,L$0008
stw %r19,-4(%r28)
.CALL ARGW0=GR
bl _Z3fooR3Foo,%r2
ldo -120(%r30),%r26
The linux output doesn't have the -4 offset:
ldi 1,%r28
stw %r2,-20(%r30)
.LCFI0:
copy %r28,%r21
ldo 128(%r30),%r30
.LCFI1:
ldi 4,%r19
stw %r28,-120(%r30)
ldo -120(%r30),%r26
ldi 16,%r20
.L2:
addl %r19,%r26,%r28
ldo 4(%r19),%r19
comb,<> %r20,%r19,.L2
stw %r21,0(%r28)
bl _Z3fooR3Foo,%r2
nop
Offhand, then hpux code appears better optimized.
Dave
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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From: dave at hiauly1 dot hia dot nrc dot ca @ 2006-09-10 18:39 UTC (permalink / raw)
To: gcc-bugs
------- Comment #12 from dave at hiauly1 dot hia dot nrc dot ca 2006-09-10 18:39 -------
Subject: Re: g++.dg/tree-ssa/ivopts-1.C fails
> The linux output doesn't have the -4 offset:
>
> ldi 1,%r28
> stw %r2,-20(%r30)
> .LCFI0:
> copy %r28,%r21
> ldo 128(%r30),%r30
> .LCFI1:
> ldi 4,%r19
> stw %r28,-120(%r30)
> ldo -120(%r30),%r26
> ldi 16,%r20
> .L2:
> addl %r19,%r26,%r28
> ldo 4(%r19),%r19
> comb,<> %r20,%r19,.L2
> stw %r21,0(%r28)
> bl _Z3fooR3Foo,%r2
> nop
It seems like the code generated for the hppa-unknown-linux-gnu target
has been getting worse in each release since 4.0.0. Here is the 4.0.0
assembler code:
stw %r2,-20(%r30)
.LCFI0:
ldi 1,%r19
ldo 128(%r30),%r30
.LCFI1:
ldo -120(%r30),%r28
ldo -104(%r30),%r20
stw %r19,0(%r28)
.L8:
ldo 4(%r28),%r28
comb,<>,n %r28,%r20,.L8
stw %r19,0(%r28)
bl _Z3fooR3Foo,%r2
ldo -120(%r30),%r26
In this code, the function prologue and loop setup are only six instructions.
The loop is three instructions. The delay slot for the call to _Z3fooR3Foo
is filled. The value loaded into r26 is the same as loaded into r28 before
the loop. I would say this code is close to optimal aside from unrolling
loop completely.
Here is the code generated by Debian 4.1.1-13:
stw %r2,-20(%r30)
.LCFI0:
ldi 0,%r19
ldo 128(%r30),%r30
.LCFI1:
ldi 1,%r21
ldo -120(%r30),%r26
ldi 16,%r20
.L2:
addl %r19,%r26,%r28
ldo 4(%r19),%r19
comb,<> %r20,%r19,.L2
stw %r21,0(%r28)
bl _Z3fooR3Foo,%r2
nop
The prologue and loop setup are still six instructions. However,
the loop is now four instructions per iteration and we iterate one
more time. Thus, we have a significant performance regression
relative to 4.0.0 in the handling of this loop.
Possibly, this results from the compiler trying to avoid loading the
address "-120(%r30)" twice. However, the cost for loading small offsets
is the same as doing a register copy. A register copy is just a ldo
instruction with an offset of 0.
The 4.2.0 code is worse than the 4.1.1 code in that the prologue and
loop setup have now grown to eight instructions. However, we are
back to three iterations. It seems like the compiler may be trying
to avoid non-zero offsets. I don't know why this would be.
hppa_address_cost is pretty simple.
As far as the the difference between linux and hpux goes, the main
difference is that long doubles are 64 bits on linux and 128 bits
on hpux. This would affect the sizes of the cost arrays in expmed.c.
I'm wondering if somehow some of the values in these tables are
getting corrupted.
There's one puzzling difference in the linux and hpux tree dumps.
In the hpux dump, some variables are "long unsigned int" whereas in
the linux dump they are "unsigned int".
Dave
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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From: mmitchel at gcc dot gnu dot org @ 2007-05-14 21:32 UTC (permalink / raw)
To: gcc-bugs
------- Comment #13 from mmitchel at gcc dot gnu dot org 2007-05-14 22:26 -------
Will not be fixed in 4.2.0; retargeting at 4.2.1.
--
mmitchel at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.2.0 |4.2.1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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To: gcc-bugs
--
mmitchel at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.2.1 |4.2.2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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From: mmitchel at gcc dot gnu dot org @ 2007-10-09 19:30 UTC (permalink / raw)
To: gcc-bugs
------- Comment #14 from mmitchel at gcc dot gnu dot org 2007-10-09 19:21 -------
Change target milestone to 4.2.3, as 4.2.2 has been released.
--
mmitchel at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.2.2 |4.2.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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From: jsm28 at gcc dot gnu dot org @ 2008-02-01 16:54 UTC (permalink / raw)
To: gcc-bugs
------- Comment #15 from jsm28 at gcc dot gnu dot org 2008-02-01 16:52 -------
4.2.3 is being released now, changing milestones of open bugs to 4.2.4.
--
jsm28 at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.2.3 |4.2.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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From: rguenth at gcc dot gnu dot org @ 2008-02-01 17:04 UTC (permalink / raw)
To: gcc-bugs
------- Comment #16 from rguenth at gcc dot gnu dot org 2008-02-01 16:58 -------
Dave, is this test still failing on hppa? On the branch and trunk?
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |WAITING
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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2008-02-01 18:23 ` dave at hiauly1 dot hia dot nrc dot ca
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From: dave at hiauly1 dot hia dot nrc dot ca @ 2008-02-01 18:09 UTC (permalink / raw)
To: gcc-bugs
------- Comment #17 from dave at hiauly1 dot hia dot nrc dot ca 2008-02-01 18:08 -------
Subject: Re: g++.dg/tree-ssa/ivopts-1.C fails
> Dave, is this test still failing on hppa? On the branch and trunk?
It is not failing on either 4.2 or trunk. Checked hppa-unknown-linux-gnu,
hppa2.0w-hp-hpux11.11 and hppa64-hp-hpux11.11.
Dave
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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@ 2008-02-01 18:14 ` rguenth at gcc dot gnu dot org
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17 siblings, 0 replies; 19+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2008-02-01 18:14 UTC (permalink / raw)
To: gcc-bugs
------- Comment #18 from rguenth at gcc dot gnu dot org 2008-02-01 18:13 -------
Thus fixed.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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From: dave at hiauly1 dot hia dot nrc dot ca @ 2008-02-01 18:23 UTC (permalink / raw)
To: gcc-bugs
------- Comment #19 from dave at hiauly1 dot hia dot nrc dot ca 2008-02-01 18:23 -------
Subject: Re: g++.dg/tree-ssa/ivopts-1.C fails
> Thus fixed.
The test needs adjustment.
Dave
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
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