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* [Bug c++/63658] New: [4.8/4.9 Regression] Using class reference as template parameter causes compilation to fail
@ 2014-10-27 15:20 patrick.riphagen at xsens dot com
2014-10-27 15:28 ` [Bug c++/63658] " redi at gcc dot gnu.org
` (9 more replies)
0 siblings, 10 replies; 11+ messages in thread
From: patrick.riphagen at xsens dot com @ 2014-10-27 15:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63658
Bug ID: 63658
Summary: [4.8/4.9 Regression] Using class reference as template
parameter causes compilation to fail
Product: gcc
Version: 4.9.1
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: patrick.riphagen at xsens dot com
Created attachment 33818
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33818&action=edit
Source code containing the bug
We have a template class which is based on a descriptor class.
The template class is specialized later on.
I have attached a stripped version of the problematic code.
Using gcc 4.7 and 4.8 we did not have a problem compiling this code.
Using gcc 4.9.1 (gcc version 4.9.1 (Ubuntu 4.9.1-16ubuntu6) ) this code does
not compile anymore.
The error is:
main.cpp:15:17: error: prototype for ‘void foo<D>::size() [with Descriptor& D =
(* & g_descriptor)]’ does not match any in class ‘foo<(* & g_descriptor)>’
template<> void foo<g_descriptor>::size()
^
main.cpp:11:7: error: candidate is: void foo<D>::size() [with Descriptor& D =
(* & g_descriptor)]
void size ();
It looks like the prototype for and candidate look exactly the same, however
compilation still fails
>From gcc-bugs-return-465060-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 27 15:20:15 2014
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From: "wdijkstr at arm dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/61915] [AArch64] High amounts of GP to FP register moves using LRA on AArch64
Date: Mon, 27 Oct 2014 15:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida915
--- Comment #18 from Wilco <wdijkstr at arm dot com> ---
(In reply to Andrew Pinski from comment #17)
> (In reply to Wilco from comment #16)
> > (In reply to Andrew Pinski from comment #13)
> > > (In reply to Wilco from comment #9)
> > > > I committed a workaround
> > > > (http://gcc.gnu.org/ml/gcc-patches/2014-09/msg00362.html) by increasing the
> > > > int<->fp move cost. Can you try this and check the issue has indeed gone?
> > > > You need -mcpu=cortex-a57.
> > >
> > > Note when I submitted ThunderX support I used a base of 2 instead of a base
> > > of 1 due to 2 being the default and all values are relative to that. This
> > > is mentioned in https://gcc.gnu.org/onlinedocs/gccint/Costs.html . In fact
> > > a value of 2 means reload will not look at the constraints of a move
> > > instruction.
> > >
> > > So I think the cortex* cpus should also re-base these values based on 2
> > > being gpr-to-gpr value.
> >
> > You mean only use multiples of 2? That's interesting as I've not seen that
> > done elsewhere. Are these costs in any way related to real issue and latency
> > cycles? Most targets have complex tables with all the exact latencies for
> > every little uarch detail, but from what I've seen in the allocator these
> > costs have almost no meaning.
>
> Not always multiple of 2 though in the case of ThunderX they are multiple of
> twos. The costs are not really directly related to the latency cost but it
> is relative to one another. So I could have used 2, 3, 4 (meaning latency
> of 1, 2, 3) instead. I used the factor of 2 instead of 1 for ThunderX
> because 2 + 3 != 4 but rather 5.
OK.
> > So did you find that setting the FP move cost so low actually works alright
> > on ThunderX? I'd like to figure out a setting for the generic target that
> > works out well across all AArch64 implementations.
>
> Yes it seems to at least on the things we have benchmarked but we have not
> done much big benchmarks like SPEC yet.
Well in one testcase I'm seeing 11 str and 26 ldr spills on a53/a57 but 407
fmoves on thunderx. I don't see how that could be a good tradeoff unless fmov
has negative latency...
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/63658] [4.8/4.9 Regression] Using class reference as template parameter causes compilation to fail
2014-10-27 15:20 [Bug c++/63658] New: [4.8/4.9 Regression] Using class reference as template parameter causes compilation to fail patrick.riphagen at xsens dot com
@ 2014-10-27 15:28 ` redi at gcc dot gnu.org
2014-10-27 15:37 ` [Bug c++/63658] [4.9/5 " redi at gcc dot gnu.org
` (8 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: redi at gcc dot gnu.org @ 2014-10-27 15:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63658
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|major |normal
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/63658] [4.9/5 Regression] Using class reference as template parameter causes compilation to fail
2014-10-27 15:20 [Bug c++/63658] New: [4.8/4.9 Regression] Using class reference as template parameter causes compilation to fail patrick.riphagen at xsens dot com
2014-10-27 15:28 ` [Bug c++/63658] " redi at gcc dot gnu.org
@ 2014-10-27 15:37 ` redi at gcc dot gnu.org
2014-10-27 20:46 ` daniel.kruegler at googlemail dot com
` (7 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: redi at gcc dot gnu.org @ 2014-10-27 15:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63658
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2014-10-27
Summary|[4.8/4.9 Regression] Using |[4.9/5 Regression] Using
|class reference as template |class reference as template
|parameter causes |parameter causes
|compilation to fail |compilation to fail
Ever confirmed|0 |1
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/63658] [4.9/5 Regression] Using class reference as template parameter causes compilation to fail
2014-10-27 15:20 [Bug c++/63658] New: [4.8/4.9 Regression] Using class reference as template parameter causes compilation to fail patrick.riphagen at xsens dot com
2014-10-27 15:28 ` [Bug c++/63658] " redi at gcc dot gnu.org
2014-10-27 15:37 ` [Bug c++/63658] [4.9/5 " redi at gcc dot gnu.org
@ 2014-10-27 20:46 ` daniel.kruegler at googlemail dot com
2014-10-28 9:05 ` rguenth at gcc dot gnu.org
` (6 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2014-10-27 20:46 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63658
Daniel Krügler <daniel.kruegler at googlemail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |daniel.kruegler@googlemail.
| |com
--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
The problem seems not to depend on the friend declaration, therefore a more
reduced example code can be formed:
//------------------
struct Descriptor {};
template <Descriptor & D>
struct foo
{
void size ();
};
Descriptor g_descriptor = {};
template<> void foo<g_descriptor>::size()
{
}
//------------------
>From gcc-bugs-return-465093-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 27 20:46:38 2014
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From: "izamyatin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/63534] [5 Regression] Bootstrap failure on x86_64/i686-linux
Date: Mon, 27 Oct 2014 21:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc534
--- Comment #49 from Igor Zamyatin <izamyatin at gmail dot com> ---
Testing a patch to fix asan failures
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/63658] [4.9/5 Regression] Using class reference as template parameter causes compilation to fail
2014-10-27 15:20 [Bug c++/63658] New: [4.8/4.9 Regression] Using class reference as template parameter causes compilation to fail patrick.riphagen at xsens dot com
` (2 preceding siblings ...)
2014-10-27 20:46 ` daniel.kruegler at googlemail dot com
@ 2014-10-28 9:05 ` rguenth at gcc dot gnu.org
2014-10-30 10:43 ` jakub at gcc dot gnu.org
` (5 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-10-28 9:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63658
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |4.9.2
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/63658] [4.9/5 Regression] Using class reference as template parameter causes compilation to fail
2014-10-27 15:20 [Bug c++/63658] New: [4.8/4.9 Regression] Using class reference as template parameter causes compilation to fail patrick.riphagen at xsens dot com
` (3 preceding siblings ...)
2014-10-28 9:05 ` rguenth at gcc dot gnu.org
@ 2014-10-30 10:43 ` jakub at gcc dot gnu.org
2014-11-21 0:48 ` jason at gcc dot gnu.org
` (4 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2014-10-30 10:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63658
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.9.2 |4.9.3
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.9.2 has been released.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/63658] [4.9/5 Regression] Using class reference as template parameter causes compilation to fail
2014-10-27 15:20 [Bug c++/63658] New: [4.8/4.9 Regression] Using class reference as template parameter causes compilation to fail patrick.riphagen at xsens dot com
` (4 preceding siblings ...)
2014-10-30 10:43 ` jakub at gcc dot gnu.org
@ 2014-11-21 0:48 ` jason at gcc dot gnu.org
2014-11-24 13:39 ` [Bug c++/63658] [4.9 " rguenth at gcc dot gnu.org
` (3 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: jason at gcc dot gnu.org @ 2014-11-21 0:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63658
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Fri Nov 21 00:47:50 2014
New Revision: 217900
URL: https://gcc.gnu.org/viewcvs?rev=217900&root=gcc&view=rev
Log:
PR c++/63658
* pt.c (convert_nontype_argument): Call convert_from_reference.
(check_instantiated_arg): Don't be confused by reference refs.
(unify): Look through reference refs on the arg, too.
* mangle.c (write_template_arg): Look through reference refs.
Added:
trunk/gcc/testsuite/g++.dg/template/ref9.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/mangle.c
trunk/gcc/cp/pt.c
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/63658] [4.9 Regression] Using class reference as template parameter causes compilation to fail
2014-10-27 15:20 [Bug c++/63658] New: [4.8/4.9 Regression] Using class reference as template parameter causes compilation to fail patrick.riphagen at xsens dot com
` (5 preceding siblings ...)
2014-11-21 0:48 ` jason at gcc dot gnu.org
@ 2014-11-24 13:39 ` rguenth at gcc dot gnu.org
2014-11-24 16:55 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-11-24 13:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63658
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |5.0
Summary|[4.9/5 Regression] Using |[4.9 Regression] Using
|class reference as template |class reference as template
|parameter causes |parameter causes
|compilation to fail |compilation to fail
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/63658] [4.9 Regression] Using class reference as template parameter causes compilation to fail
2014-10-27 15:20 [Bug c++/63658] New: [4.8/4.9 Regression] Using class reference as template parameter causes compilation to fail patrick.riphagen at xsens dot com
` (6 preceding siblings ...)
2014-11-24 13:39 ` [Bug c++/63658] [4.9 " rguenth at gcc dot gnu.org
@ 2014-11-24 16:55 ` rguenth at gcc dot gnu.org
2015-01-07 15:18 ` jason at gcc dot gnu.org
2015-01-20 11:23 ` paolo.carlini at oracle dot com
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-11-24 16:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63658
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/63658] [4.9 Regression] Using class reference as template parameter causes compilation to fail
2014-10-27 15:20 [Bug c++/63658] New: [4.8/4.9 Regression] Using class reference as template parameter causes compilation to fail patrick.riphagen at xsens dot com
` (7 preceding siblings ...)
2014-11-24 16:55 ` rguenth at gcc dot gnu.org
@ 2015-01-07 15:18 ` jason at gcc dot gnu.org
2015-01-20 11:23 ` paolo.carlini at oracle dot com
9 siblings, 0 replies; 11+ messages in thread
From: jason at gcc dot gnu.org @ 2015-01-07 15:18 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63658
--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Wed Jan 7 15:17:59 2015
New Revision: 219305
URL: https://gcc.gnu.org/viewcvs?rev=219305&root=gcc&view=rev
Log:
PR c++/63658
* pt.c (convert_nontype_argument): Call convert_from_reference.
(check_instantiated_arg): Don't be confused by reference refs.
(unify): Look through reference refs on the arg, too.
* mangle.c (write_template_arg): Look through reference refs.
Added:
branches/gcc-4_9-branch/gcc/testsuite/g++.dg/template/ref9.C
Modified:
branches/gcc-4_9-branch/gcc/cp/ChangeLog
branches/gcc-4_9-branch/gcc/cp/mangle.c
branches/gcc-4_9-branch/gcc/cp/pt.c
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/63658] [4.9 Regression] Using class reference as template parameter causes compilation to fail
2014-10-27 15:20 [Bug c++/63658] New: [4.8/4.9 Regression] Using class reference as template parameter causes compilation to fail patrick.riphagen at xsens dot com
` (8 preceding siblings ...)
2015-01-07 15:18 ` jason at gcc dot gnu.org
@ 2015-01-20 11:23 ` paolo.carlini at oracle dot com
9 siblings, 0 replies; 11+ messages in thread
From: paolo.carlini at oracle dot com @ 2015-01-20 11:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63658
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed then.
^ permalink raw reply [flat|nested] 11+ messages in thread
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