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* [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls
@ 2012-01-17 11:34 jakub at gcc dot gnu.org
2012-01-18 6:14 ` [Bug tree-optimization/51879] " vries at gcc dot gnu.org
` (14 more replies)
0 siblings, 15 replies; 16+ messages in thread
From: jakub at gcc dot gnu.org @ 2012-01-17 11:34 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
Bug #: 51879
Summary: Missed tail merging with non-const/pure calls
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: jakub@gcc.gnu.org
CC: vries@gcc.gnu.org
Depends on: 51877
We don't tail merge currently:
int bar (int);
void baz (int);
void
foo (int y)
{
int a;
if (y == 6)
a = bar (7);
else
a = bar (7);
baz (a);
}
(both before the PR51877 fix and after it), because both SSA_NAMEs on the lhs
of the calls aren't valueized the same by SCCVN.
Similarly for:
if (y == 6)
a = bar (7) + 6;
else
a = bar (7) + 6;
or
if (y)
baz (bar (7) + 6);
else
baz (bar (7) + 6);
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
@ 2012-01-18 6:14 ` vries at gcc dot gnu.org
2012-01-18 10:46 ` jakub at gcc dot gnu.org
` (13 subsequent siblings)
14 siblings, 0 replies; 16+ messages in thread
From: vries at gcc dot gnu.org @ 2012-01-18 6:14 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
--- Comment #1 from vries at gcc dot gnu.org 2012-01-18 05:41:34 UTC ---
This works for the 3 examples:
...
Index: tree-ssa-sccvn.c
===================================================================
--- tree-ssa-sccvn.c (revision 182098)
+++ tree-ssa-sccvn.c (working copy)
@@ -3360,8 +3360,7 @@ visit_use (tree use)
/* ??? We should handle stores from calls. */
else if (TREE_CODE (lhs) == SSA_NAME)
{
- if (!gimple_call_internal_p (stmt)
- && gimple_call_flags (stmt) & (ECF_PURE | ECF_CONST))
+ if (!gimple_call_internal_p (stmt))
changed = visit_reference_op_call (lhs, stmt);
else
changed = defs_to_varying (stmt);
...
I'll test this to see what breaks.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
2012-01-18 6:14 ` [Bug tree-optimization/51879] " vries at gcc dot gnu.org
@ 2012-01-18 10:46 ` jakub at gcc dot gnu.org
2012-01-18 10:59 ` rguenth at gcc dot gnu.org
` (12 subsequent siblings)
14 siblings, 0 replies; 16+ messages in thread
From: jakub at gcc dot gnu.org @ 2012-01-18 10:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-01-18 10:36:39 UTC ---
I'm afraid a lot would break. It really depends on what you use VN for and on
what code.
If you have:
D.12345_1 = bar (7);
D.12346_2 = bar (7);
and bar isn't const/pure call, then if VN equivalences D.12345_1 and D.12346_2,
it is wrong. Of course if you have:
<bb7>:
D.12345_1 = bar (7);
goto bb9;
<bb8>:
D.12346_2 = bar (7);
<bb9>:
D.12347_3 = PHI <D.12345_1(7), D.12346_2(8)>
(this case), you could VN them the same.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
2012-01-18 6:14 ` [Bug tree-optimization/51879] " vries at gcc dot gnu.org
2012-01-18 10:46 ` jakub at gcc dot gnu.org
@ 2012-01-18 10:59 ` rguenth at gcc dot gnu.org
2012-01-18 11:23 ` rguenth at gcc dot gnu.org
` (11 subsequent siblings)
14 siblings, 0 replies; 16+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-01-18 10:59 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-18 10:45:01 UTC ---
(In reply to comment #2)
> I'm afraid a lot would break. It really depends on what you use VN for and on
> what code.
> If you have:
> D.12345_1 = bar (7);
> D.12346_2 = bar (7);
> and bar isn't const/pure call, then if VN equivalences D.12345_1 and D.12346_2,
> it is wrong. Of course if you have:
> <bb7>:
> D.12345_1 = bar (7);
> goto bb9;
> <bb8>:
> D.12346_2 = bar (7);
> <bb9>:
> D.12347_3 = PHI <D.12345_1(7), D.12346_2(8)>
> (this case), you could VN them the same.
Yes, but not for
D.12345_1 = bar (7);
D.12346_2 = bar (7);
so you can't really value-number the calls the same. As we are working
on SSA SCCs and not on a CFG (and thus do not do predicated value-numbering)
that ability is useless.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
` (2 preceding siblings ...)
2012-01-18 10:59 ` rguenth at gcc dot gnu.org
@ 2012-01-18 11:23 ` rguenth at gcc dot gnu.org
2012-01-23 14:51 ` vries at gcc dot gnu.org
` (10 subsequent siblings)
14 siblings, 0 replies; 16+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-01-18 11:23 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2012-01-18
Ever Confirmed|0 |1
--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-18 10:46:00 UTC ---
Confirmed btw.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
` (3 preceding siblings ...)
2012-01-18 11:23 ` rguenth at gcc dot gnu.org
@ 2012-01-23 14:51 ` vries at gcc dot gnu.org
2012-01-24 10:21 ` vries at gcc dot gnu.org
` (9 subsequent siblings)
14 siblings, 0 replies; 16+ messages in thread
From: vries at gcc dot gnu.org @ 2012-01-23 14:51 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
--- Comment #5 from vries at gcc dot gnu.org 2012-01-23 14:10:38 UTC ---
Created attachment 26430
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26430
Tentative patch
2012-01-23 Tom de Vries <tom@codesourcery.com>
PR tree-optimization/51879
tree-ssa-sccvn.c (visit_reference_op_call): Handle gimple_vdef.
(visit_use): Handle non-pure/const calls using visit_reference_op_call.
gcc.dg/pr51879.c: New test.
gcc.dg/pr51879-2.c: Same.
gcc.dg/pr51879-3.c: Same.
gcc.dg/pr51879-4.c: Same.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
` (4 preceding siblings ...)
2012-01-23 14:51 ` vries at gcc dot gnu.org
@ 2012-01-24 10:21 ` vries at gcc dot gnu.org
2012-01-25 10:10 ` vries at gcc dot gnu.org
` (8 subsequent siblings)
14 siblings, 0 replies; 16+ messages in thread
From: vries at gcc dot gnu.org @ 2012-01-24 10:21 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
vries at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
AssignedTo|unassigned at gcc dot |vries at gcc dot gnu.org
|gnu.org |
--- Comment #6 from vries at gcc dot gnu.org 2012-01-24 10:12:38 UTC ---
Submitted: http://gcc.gnu.org/ml/gcc-patches/2012-01/msg01178.html
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
` (5 preceding siblings ...)
2012-01-24 10:21 ` vries at gcc dot gnu.org
@ 2012-01-25 10:10 ` vries at gcc dot gnu.org
2012-02-01 11:20 ` vries at gcc dot gnu.org
` (7 subsequent siblings)
14 siblings, 0 replies; 16+ messages in thread
From: vries at gcc dot gnu.org @ 2012-01-25 10:10 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
vries at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #26430|0 |1
is obsolete| |
--- Comment #7 from vries at gcc dot gnu.org 2012-01-25 09:46:52 UTC ---
Created attachment 26454
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26454
Updated tentative patch
This patch was bootstrapped and reg-tested on x86_64, and fails only in 3 tests
- gcc.c-torture/compile/20030224-1.c
- gcc.c-torture/execute/20020412-1.c
- gcc.dg/lto/20090706-1_0.c
on ICE from PR51990.
2012-01-25 Tom de Vries <tom@codesourcery.com>
PR tree-optimization/51879
* tree-ssa-sccvn.h (struct vn_reference_s): Add vdef field.
* tree-ssa-sccvn.c (visit_reference_op_call): Handle gimple_vdef.
Handle case that lhs is NULL_TREE.
(visit_use): Handle non-pure/const calls and calls without result using
visit_reference_op_call.
gcc.dg/pr51879.c: New test.
gcc.dg/pr51879-2.c: Same.
gcc.dg/pr51879-3.c: Same.
gcc.dg/pr51879-4.c: Same.
gcc.dg/pr51879-6.c: Same.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
` (6 preceding siblings ...)
2012-01-25 10:10 ` vries at gcc dot gnu.org
@ 2012-02-01 11:20 ` vries at gcc dot gnu.org
2012-04-27 6:13 ` vries at gcc dot gnu.org
` (6 subsequent siblings)
14 siblings, 0 replies; 16+ messages in thread
From: vries at gcc dot gnu.org @ 2012-02-01 11:20 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
--- Comment #8 from vries at gcc dot gnu.org 2012-02-01 11:20:31 UTC ---
submitted patch: http://gcc.gnu.org/ml/gcc-patches/2012-01/msg01513.html
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
` (7 preceding siblings ...)
2012-02-01 11:20 ` vries at gcc dot gnu.org
@ 2012-04-27 6:13 ` vries at gcc dot gnu.org
2012-04-27 6:29 ` vries at gcc dot gnu.org
` (5 subsequent siblings)
14 siblings, 0 replies; 16+ messages in thread
From: vries at gcc dot gnu.org @ 2012-04-27 6:13 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
--- Comment #9 from vries at gcc dot gnu.org 2012-04-27 06:12:55 UTC ---
Author: vries
Date: Fri Apr 27 06:12:49 2012
New Revision: 186894
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186894
Log:
2012-04-27 Tom de Vries <tom@codesourcery.com>
PR tree-optimization/51879
* tree-ssa-sccvn.h (struct vn_reference_s): Add result_vdef field.
* tree-ssa-sccvn.c (mark_use_processed): New function, factored out
of ...
(defs_to_varying): ... here. Don't set use_processed.
(visit_reference_op_call): Handle gimple_vdef.
Handle case that lhs is NULL_TREE.
(visit_use): Use mark_use_processed. Handle calls with side-effect
using visit_reference_op_call.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-ssa-sccvn.c
trunk/gcc/tree-ssa-sccvn.h
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
` (8 preceding siblings ...)
2012-04-27 6:13 ` vries at gcc dot gnu.org
@ 2012-04-27 6:29 ` vries at gcc dot gnu.org
2012-04-27 6:36 ` vries at gcc dot gnu.org
` (4 subsequent siblings)
14 siblings, 0 replies; 16+ messages in thread
From: vries at gcc dot gnu.org @ 2012-04-27 6:29 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
--- Comment #10 from vries at gcc dot gnu.org 2012-04-27 06:28:55 UTC ---
Author: vries
Date: Fri Apr 27 06:28:49 2012
New Revision: 186895
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186895
Log:
2012-04-27 Tom de Vries <tom@codesourcery.com>
PR tree-optimization/51879
* gcc.dg/pr51879.c: New test.
* gcc.dg/pr51879-2.c: Same.
* gcc.dg/pr51879-3.c: Same.
* gcc.dg/pr51879-4.c: Same.
* gcc.dg/pr51879-6.c: Same.
Added:
trunk/gcc/testsuite/gcc.dg/pr51879-2.c
trunk/gcc/testsuite/gcc.dg/pr51879-3.c
trunk/gcc/testsuite/gcc.dg/pr51879-4.c
trunk/gcc/testsuite/gcc.dg/pr51879-6.c
trunk/gcc/testsuite/gcc.dg/pr51879.c
Modified:
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
` (9 preceding siblings ...)
2012-04-27 6:29 ` vries at gcc dot gnu.org
@ 2012-04-27 6:36 ` vries at gcc dot gnu.org
2012-07-06 11:22 ` vries at gcc dot gnu.org
` (3 subsequent siblings)
14 siblings, 0 replies; 16+ messages in thread
From: vries at gcc dot gnu.org @ 2012-04-27 6:36 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
--- Comment #11 from vries at gcc dot gnu.org 2012-04-27 06:35:30 UTC ---
All listed examples fixed in r186894.
Todo: follow-up with fix for:
...
struct S { int i; };
extern struct S foo (void);
extern int foo2 (void);
struct S s;
int bar (int c) {
int r;
if (c)
{
s = foo ();
r = foo2 ();
}
else
{
s = foo ();
r = foo2 ();
}
return r;
}
...
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
` (10 preceding siblings ...)
2012-04-27 6:36 ` vries at gcc dot gnu.org
@ 2012-07-06 11:22 ` vries at gcc dot gnu.org
2012-07-06 11:22 ` vries at gcc dot gnu.org
` (2 subsequent siblings)
14 siblings, 0 replies; 16+ messages in thread
From: vries at gcc dot gnu.org @ 2012-07-06 11:22 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
--- Comment #12 from vries at gcc dot gnu.org 2012-07-06 11:22:10 UTC ---
Author: vries
Date: Fri Jul 6 11:22:06 2012
New Revision: 189323
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189323
Log:
2012-07-06 Tom de Vries <tom@codesourcery.com>
PR tree-optimization/51879
* tree-ssa-sccvn.c (copy_reference_ops_from_call)
(visit_reference_op_call): Handle case that lhs is not an SSA_NAME.
(visit_use): Also call visit_reference_op_call for calls with a vdef.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-ssa-sccvn.c
--- Comment #13 from vries at gcc dot gnu.org 2012-07-06 11:22:15 UTC ---
Author: vries
Date: Fri Jul 6 11:22:12 2012
New Revision: 189324
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189324
Log:
2012-07-06 Tom de Vries <tom@codesourcery.com>
PR tree-optimization/51879
* gcc.dg/pr51879-16.c: New test.
* gcc.dg/pr51879-17.c: Same.
Added:
trunk/gcc/testsuite/gcc.dg/pr51879-16.c
trunk/gcc/testsuite/gcc.dg/pr51879-17.c
Modified:
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
` (11 preceding siblings ...)
2012-07-06 11:22 ` vries at gcc dot gnu.org
@ 2012-07-06 11:22 ` vries at gcc dot gnu.org
2012-07-06 11:22 ` vries at gcc dot gnu.org
2012-07-06 11:31 ` vries at gcc dot gnu.org
14 siblings, 0 replies; 16+ messages in thread
From: vries at gcc dot gnu.org @ 2012-07-06 11:22 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
--- Comment #12 from vries at gcc dot gnu.org 2012-07-06 11:22:10 UTC ---
Author: vries
Date: Fri Jul 6 11:22:06 2012
New Revision: 189323
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189323
Log:
2012-07-06 Tom de Vries <tom@codesourcery.com>
PR tree-optimization/51879
* tree-ssa-sccvn.c (copy_reference_ops_from_call)
(visit_reference_op_call): Handle case that lhs is not an SSA_NAME.
(visit_use): Also call visit_reference_op_call for calls with a vdef.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-ssa-sccvn.c
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
` (12 preceding siblings ...)
2012-07-06 11:22 ` vries at gcc dot gnu.org
@ 2012-07-06 11:22 ` vries at gcc dot gnu.org
2012-07-06 11:31 ` vries at gcc dot gnu.org
14 siblings, 0 replies; 16+ messages in thread
From: vries at gcc dot gnu.org @ 2012-07-06 11:22 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
--- Comment #13 from vries at gcc dot gnu.org 2012-07-06 11:22:15 UTC ---
Author: vries
Date: Fri Jul 6 11:22:12 2012
New Revision: 189324
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189324
Log:
2012-07-06 Tom de Vries <tom@codesourcery.com>
PR tree-optimization/51879
* gcc.dg/pr51879-16.c: New test.
* gcc.dg/pr51879-17.c: Same.
Added:
trunk/gcc/testsuite/gcc.dg/pr51879-16.c
trunk/gcc/testsuite/gcc.dg/pr51879-17.c
Modified:
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
2012-01-17 11:34 [Bug tree-optimization/51879] New: Missed tail merging with non-const/pure calls jakub at gcc dot gnu.org
` (13 preceding siblings ...)
2012-07-06 11:22 ` vries at gcc dot gnu.org
@ 2012-07-06 11:31 ` vries at gcc dot gnu.org
14 siblings, 0 replies; 16+ messages in thread
From: vries at gcc dot gnu.org @ 2012-07-06 11:31 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879
vries at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
--- Comment #14 from vries at gcc dot gnu.org 2012-07-06 11:31:33 UTC ---
follow-up patch and test-cases checked in, closing bug.
^ permalink raw reply [flat|nested] 16+ messages in thread
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