* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
2021-11-16 17:16 [Bug tree-optimization/103278] New: [12 Regression] Recent change to cddce inhibits switch optimization law at gcc dot gnu.org
@ 2021-11-16 23:25 ` pinskia at gcc dot gnu.org
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From: pinskia at gcc dot gnu.org @ 2021-11-16 23:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103278
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |seurer at gcc dot gnu.org
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 103293 has been marked as a duplicate of this bug. ***
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* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
2021-11-16 17:16 [Bug tree-optimization/103278] New: [12 Regression] Recent change to cddce inhibits switch optimization law at gcc dot gnu.org
2021-11-16 23:25 ` [Bug tree-optimization/103278] " pinskia at gcc dot gnu.org
@ 2021-11-16 23:29 ` pinskia at gcc dot gnu.org
2021-11-17 14:48 ` law at gcc dot gnu.org
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From: pinskia at gcc dot gnu.org @ 2021-11-16 23:29 UTC (permalink / raw)
To: gcc-bugs
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target Milestone|--- |12.0
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2021-11-16
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
>;; Canonical GIMPLE case clusters: 9-10 12-13 32 48
I suspect there is some cost issue going on here.
DCE is now able to combine empty bb's into one which causes iftoswitch to have
a cost fit.
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* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
2021-11-16 17:16 [Bug tree-optimization/103278] New: [12 Regression] Recent change to cddce inhibits switch optimization law at gcc dot gnu.org
2021-11-16 23:25 ` [Bug tree-optimization/103278] " pinskia at gcc dot gnu.org
2021-11-16 23:29 ` pinskia at gcc dot gnu.org
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From: law at gcc dot gnu.org @ 2021-11-17 14:48 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #3 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Note we also see these regressions:
rl78-elf
if-to-switch-5
if-to-switch-9
xstormy16-elf
if-to-switch-9
sh3-linux-gnu
sh3eb-linux-gnu
gcc.target/sh/pr51244-19.c, but I think this is fixable with a trivial sh.md
change
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* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
2021-11-16 17:16 [Bug tree-optimization/103278] New: [12 Regression] Recent change to cddce inhibits switch optimization law at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2021-11-18 7:36 UTC (permalink / raw)
To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will have a look
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* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
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From: rguenth at gcc dot gnu.org @ 2021-11-18 8:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103278
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |marxin at gcc dot gnu.org
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
So the main issue is that while CD-DCE tries to undo the factorization by
running cleanup CFG, this process has the choice between two forwarder blocks
to remove - one pre-existing to disambiguate the two edges from the last test
into the PHI
and the one we created. But CFG cleanup simply picks the first candidate
which, in some cases is not the newly created one. That results in different
handling
of if-to-switch cluster processing. In particular the ->m_has_forward_bb
handling seems important. If we do
diff --git a/gcc/gimple-if-to-switch.cc b/gcc/gimple-if-to-switch.cc
index 16fabef7ca0..157c5f6f10b 100644
--- a/gcc/gimple-if-to-switch.cc
+++ b/gcc/gimple-if-to-switch.cc
@@ -219,8 +219,7 @@ if_chain::is_beneficial ()
{
simple_cluster *right = static_cast<simple_cluster *> (clusters[i]);
tree type = TREE_TYPE (left->get_low ());
- if (!left->m_has_forward_bb
- && !right->m_has_forward_bb
+ if (left->m_has_forward_bb == right->m_has_forward_bb
&& left->m_case_bb == right->m_case_bb)
{
if (wi::eq_p (wi::to_wide (right->get_low ()) - wi::to_wide
which seems more natural then even with the original IL we don't get any
if-to-switch as we seem to fail JT building because the number of clusters
is then just 4 which is lower than case_values_threshold () which is 5.
If we supply --param case-values-threshold=4 to the testcase it is optimized
(that overrides the target default) with the result
switch (aChar_10(D)) <default: <L7> [INV], case 9 ... 10: <L6> [INV], case
12: <L6> [INV], case 13: <L6> [INV], case 32: <L6> [INV], case 48: <L6> [INV]>
<bb 3> :
<L6>:
<bb 4> :
# iftmp.0_9 = PHI <1(3), 0(2)>
<L7>:
return iftmp.0_9;
compared to the following before the CD-DCE change which looks clearly worse
(but even the above has unmerged case 12 and 13?!)
switch (aChar_10(D)) <default: <L10> [INV], case 9 ... 10: <L6> [INV], case
12: <L6> [INV], case 13: <L7> [INV], case 32: <L7> [INV], case 48: <L8> [INV]>
<bb 3> :
<L6>:
goto <bb 6>; [100.00%]
<bb 4> :
<L7>:
goto <bb 6>; [100.00%]
<bb 5> :
<L8>:
<bb 6> :
# iftmp.0_9 = PHI <1(4), 0(2), 1(3), 1(5)>
<L10>:
return iftmp.0_9;
so this looks like a testcase issue to me.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
2021-11-16 17:16 [Bug tree-optimization/103278] New: [12 Regression] Recent change to cddce inhibits switch optimization law at gcc dot gnu.org
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From: cvs-commit at gcc dot gnu.org @ 2021-11-18 9:02 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:e28afbb90f8eca31d0a658e92e2007eb0db2a964
commit r12-5365-ge28afbb90f8eca31d0a658e92e2007eb0db2a964
Author: Richard Biener <rguenther@suse.de>
Date: Thu Nov 18 09:49:38 2021 +0100
testsuite/103278 - adjust gcc.dg/tree-ssa/if-to-switch-3.c
Analysis shows that after the CD-DCE change we produce better
code which makes if-to-switch run into case-values-threshold on
some architectures, thus the switch is deemed to simple to be
worth generating. The following statically provides
--param case-values-threshold to make the testcase less
target dependent.
2021-11-18 Richard Biener <rguenther@suse.de>
PR testsuite/103278
* gcc.dg/tree-ssa/if-to-switch-3.c: Supply
--param case-values-threshold=4.
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* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
2021-11-16 17:16 [Bug tree-optimization/103278] New: [12 Regression] Recent change to cddce inhibits switch optimization law at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2021-11-18 9:04 UTC (permalink / raw)
To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
So I believe other if-to-switch fails on "weird" targets are caused by the same
issue - Jeff, maybe you can peek into the dumps to figure the magic
case-values-threshold value to use there?
Original reported case fixed.
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* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
2021-11-16 17:16 [Bug tree-optimization/103278] New: [12 Regression] Recent change to cddce inhibits switch optimization law at gcc dot gnu.org
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From: law at gcc dot gnu.org @ 2021-11-23 3:31 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #8 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Adjusting the threshold didn't help the tests on the other targets. I'll have
to dig a little deeper into those.
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* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
2021-11-16 17:16 [Bug tree-optimization/103278] New: [12 Regression] Recent change to cddce inhibits switch optimization law at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2021-11-23 8:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103278
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|rguenth at gcc dot gnu.org |unassigned at gcc dot gnu.org
Status|RESOLVED |NEW
Resolution|FIXED |---
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
So for
rl78-elf
if-to-switch-5
we fail the JT because it's not enabled for the target. w/o the CD-DCE change
we build a bit-test from
;; Canonical GIMPLE case clusters: 34 39 44 46 58 59 60 62 92
which we then expand into a new switch without any bit tests(?).
After the CD-DCE change we have improved(?) clusters:
;; Canonical GIMPLE case clusters: 34 39 44 46 58-60 62 92
and thus the output is no longer(?) beneficial.
I wonder if the merging of clusters done as part of the sorting is
counter-productive since it distorts the profitability? If we check against
the
size of the unmerged clusters like with the following the testcase
will pass again. I also notice we don't take advantage of the
merging and create
switch (c_3(D)) <default: <L13> [INV], case 34: <L12> [INV], case 39: <L12>
[INV], case 44: <L12> [INV], case 46: <L12> [INV], case 58: <L12> [INV], case
59: <L12> [INV], case 60: <L12> [INV], case 62: <L12> [INV], case 92: <L12>
[INV]>
instead of one 'case 58-60:'
diff --git a/gcc/gimple-if-to-switch.cc b/gcc/gimple-if-to-switch.cc
index 16fabef7ca0..b64a1915e15 100644
--- a/gcc/gimple-if-to-switch.cc
+++ b/gcc/gimple-if-to-switch.cc
@@ -240,7 +240,7 @@ if_chain::is_beneficial ()
vec<cluster *> output
= jump_table_cluster::find_jump_tables (filtered_clusters);
- bool r = output.length () < filtered_clusters.length ();
+ bool r = output.length () < clusters.length ();
if (r)
{
dump_clusters (&output, "JT can be built");
@@ -251,7 +251,7 @@ if_chain::is_beneficial ()
output.release ();
output = bit_test_cluster::find_bit_tests (filtered_clusters);
- r = output.length () < filtered_clusters.length ();
+ r = output.length () < clusters.length ();
if (r)
dump_clusters (&output, "BT can be built");
Martin, can you please look into this?
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* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
2021-11-16 17:16 [Bug tree-optimization/103278] New: [12 Regression] Recent change to cddce inhibits switch optimization law at gcc dot gnu.org
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From: marxin at gcc dot gnu.org @ 2021-11-23 8:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103278
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
Status|NEW |ASSIGNED
--- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> ---
Lemme take a look.
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* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
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From: marxin at gcc dot gnu.org @ 2021-11-29 15:23 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #11 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #9)
> So for
>
> rl78-elf
> if-to-switch-5
>
> we fail the JT because it's not enabled for the target.
Yes.
> w/o the CD-DCE
> change we build a bit-test from
>
> ;; Canonical GIMPLE case clusters: 34 39 44 46 58 59 60 62 92
>
> which we then expand into a new switch without any bit tests(?).
No, the message just tells what's the canonical switch form and the
transformation
doesn't happen.
> After the CD-DCE change we have improved(?) clusters:
>
> ;; Canonical GIMPLE case clusters: 34 39 44 46 58-60 62 92
Which is nicer!
>
> and thus the output is no longer(?) beneficial.
Yes, because BT counts the number of edges in the costing model and
this is definitelly more precise. Does not make sense doing a BT
for 10-30 even though it's theoretically 21 edges.
>
> I wonder if the merging of clusters done as part of the sorting is
> counter-productive since it distorts the profitability? If we check against
> the
> size of the unmerged clusters like with the following the testcase
> will pass again. I also notice we don't take advantage of the
> merging and create
The costing is not improved by the change.
>
> switch (c_3(D)) <default: <L13> [INV], case 34: <L12> [INV], case 39:
> <L12> [INV], case 44: <L12> [INV], case 46: <L12> [INV], case 58: <L12>
> [INV], case 59: <L12> [INV], case 60: <L12> [INV], case 62: <L12> [INV],
> case 92: <L12> [INV]>
>
> instead of one 'case 58-60:'
>
> diff --git a/gcc/gimple-if-to-switch.cc b/gcc/gimple-if-to-switch.cc
> index 16fabef7ca0..b64a1915e15 100644
> --- a/gcc/gimple-if-to-switch.cc
> +++ b/gcc/gimple-if-to-switch.cc
> @@ -240,7 +240,7 @@ if_chain::is_beneficial ()
>
> vec<cluster *> output
> = jump_table_cluster::find_jump_tables (filtered_clusters);
> - bool r = output.length () < filtered_clusters.length ();
> + bool r = output.length () < clusters.length ();
> if (r)
> {
> dump_clusters (&output, "JT can be built");
> @@ -251,7 +251,7 @@ if_chain::is_beneficial ()
> output.release ();
>
> output = bit_test_cluster::find_bit_tests (filtered_clusters);
> - r = output.length () < filtered_clusters.length ();
> + r = output.length () < clusters.length ();
> if (r)
> dump_clusters (&output, "BT can be built");
>
>
> Martin, can you please look into this?
Sure, I tend to change the test in the following way:
gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-5.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-5.c
b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-5.c
index ceeae908821..54771e64e59 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-5.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-5.c
@@ -4,8 +4,8 @@
int crud (unsigned char c)
{
return (((((((((((int) c == 46) || (int) c == 44)
- || (int) c == 58) || (int) c == 59) || (int) c == 60)
- || (int) c == 62) || (int) c == 34) || (int) c == 92)
+ || (int) c == 58) || (int) c == 60) || (int) c == 62)
+ || (int) c == 64) || (int) c == 34) || (int) c == 92)
|| (int) c == 39) != 0);
}
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* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
2021-11-16 17:16 [Bug tree-optimization/103278] New: [12 Regression] Recent change to cddce inhibits switch optimization law at gcc dot gnu.org
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From: rguenther at suse dot de @ 2021-11-30 7:22 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #12 from rguenther at suse dot de <rguenther at suse dot de> ---
works for me
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* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
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From: cvs-commit at gcc dot gnu.org @ 2021-11-30 13:48 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Liska <marxin@gcc.gnu.org>:
https://gcc.gnu.org/g:7e846b0f13b8a111484eb3a330044726b9d7ad79
commit r12-5625-g7e846b0f13b8a111484eb3a330044726b9d7ad79
Author: Martin Liska <mliska@suse.cz>
Date: Mon Nov 29 16:24:12 2021 +0100
Change if-to-switch-conversion test.
PR tree-optimization/103278
gcc/testsuite/ChangeLog:
* gcc.dg/tree-ssa/if-to-switch-5.c: Make the test acceptable by
targets with no jump-tables.
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* [Bug tree-optimization/103278] [12 Regression] Recent change to cddce inhibits switch optimization
2021-11-16 17:16 [Bug tree-optimization/103278] New: [12 Regression] Recent change to cddce inhibits switch optimization law at gcc dot gnu.org
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From: marxin at gcc dot gnu.org @ 2021-11-30 13:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103278
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #14 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed.
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