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* [Bug c++/65075] New: [5 Regression] constexpr regression
@ 2015-02-16 0:34 jakub at gcc dot gnu.org
2015-02-16 0:35 ` [Bug c++/65075] " jakub at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-16 0:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65075
Bug ID: 65075
Summary: [5 Regression] constexpr regression
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jakub at gcc dot gnu.org
typedef void (*E) ();
template <class T>
constexpr E
bar ()
{
return []() {};
}
void
foo ()
{
(bar<int> ()) ();
}
is rejected since r215954 aka PR55250 with -std=c++11:
error: body of constexpr function ‘constexpr void (* bar())() [with T = int; E
= void (*)()]’ not a return-statement
The body is a return statement, just perhaps with some extra artificial
statements created for the lambda.
>From gcc-bugs-return-477349-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Feb 16 00:34:42 2015
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/64992] More optimize opportunity
Date: Mon, 16 Feb 2015 00:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd992
Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
We do not sink the code that computes d into the branch c==-1. If we did, the
second comparison would simplify to a constant. VRP is not clever enough to
"backport" new assertions to already computed values.
We could also simplify N*x==0 to x==0 even for unsigned when VRP information
tells us that overflow/wrap cannot happen (here N is 2 and x is in [0,1]).
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/65075] [5 Regression] constexpr regression
2015-02-16 0:34 [Bug c++/65075] New: [5 Regression] constexpr regression jakub at gcc dot gnu.org
@ 2015-02-16 0:35 ` jakub at gcc dot gnu.org
2015-02-16 10:18 ` rguenth at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-16 0:35 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65075
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-02-16
CC| |jason at gcc dot gnu.org,
| |paolo at gcc dot gnu.org
Target Milestone|--- |5.0
Ever confirmed|0 |1
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/65075] [5 Regression] constexpr regression
2015-02-16 0:34 [Bug c++/65075] New: [5 Regression] constexpr regression jakub at gcc dot gnu.org
2015-02-16 0:35 ` [Bug c++/65075] " jakub at gcc dot gnu.org
@ 2015-02-16 10:18 ` rguenth at gcc dot gnu.org
2015-02-16 13:56 ` paolo.carlini at oracle dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-02-16 10:18 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65075
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Priority|P3 |P1
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/65075] [5 Regression] constexpr regression
2015-02-16 0:34 [Bug c++/65075] New: [5 Regression] constexpr regression jakub at gcc dot gnu.org
2015-02-16 0:35 ` [Bug c++/65075] " jakub at gcc dot gnu.org
2015-02-16 10:18 ` rguenth at gcc dot gnu.org
@ 2015-02-16 13:56 ` paolo.carlini at oracle dot com
2015-02-16 13:59 ` jakub at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: paolo.carlini at oracle dot com @ 2015-02-16 13:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65075
--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Hi Jakub. Something like the below passes testing and works for the testcase:
Index: constexpr.c
===================================================================
--- constexpr.c (revision 220731)
+++ constexpr.c (working copy)
@@ -415,8 +415,8 @@ check_constexpr_bind_expr_vars (tree t)
gcc_assert (TREE_CODE (t) == BIND_EXPR);
for (tree var = BIND_EXPR_VARS (t); var; var = DECL_CHAIN (var))
- if (TREE_CODE (var) == TYPE_DECL
- && DECL_IMPLICIT_TYPEDEF_P (var))
+ if (DECL_IMPLICIT_TYPEDEF_P (var)
+ && !LAMBDA_TYPE_P (TREE_TYPE (var)))
return false;
return true;
}
Note that I will be traveling for a week or so, thus I'm not be able to fully
handle the issue. If we rather resolve the regression immediately, please feel
free to pick up the above / double check if it makes sense to Jason.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/65075] [5 Regression] constexpr regression
2015-02-16 0:34 [Bug c++/65075] New: [5 Regression] constexpr regression jakub at gcc dot gnu.org
` (2 preceding siblings ...)
2015-02-16 13:56 ` paolo.carlini at oracle dot com
@ 2015-02-16 13:59 ` jakub at gcc dot gnu.org
2015-02-17 8:26 ` jakub at gcc dot gnu.org
2015-02-17 8:33 ` jakub at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-16 13:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65075
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Yeah, makes sense, I've just been looking for what the flag is for the lambda
types. I can add the testcase and bootstrap/regtest it.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/65075] [5 Regression] constexpr regression
2015-02-16 0:34 [Bug c++/65075] New: [5 Regression] constexpr regression jakub at gcc dot gnu.org
` (3 preceding siblings ...)
2015-02-16 13:59 ` jakub at gcc dot gnu.org
@ 2015-02-17 8:26 ` jakub at gcc dot gnu.org
2015-02-17 8:33 ` jakub at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-17 8:26 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65075
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Feb 17 08:25:30 2015
New Revision: 220748
URL: https://gcc.gnu.org/viewcvs?rev=220748&root=gcc&view=rev
Log:
PR c++/65075
* constexpr.c (check_constexpr_bind_expr_vars): Allow
implicit typedefs for lambda types.
* g++.dg/cpp0x/pr65075.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/pr65075.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/constexpr.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/65075] [5 Regression] constexpr regression
2015-02-16 0:34 [Bug c++/65075] New: [5 Regression] constexpr regression jakub at gcc dot gnu.org
` (4 preceding siblings ...)
2015-02-17 8:26 ` jakub at gcc dot gnu.org
@ 2015-02-17 8:33 ` jakub at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-17 8:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65075
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 7+ messages in thread
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2015-02-16 0:34 [Bug c++/65075] New: [5 Regression] constexpr regression jakub at gcc dot gnu.org
2015-02-16 0:35 ` [Bug c++/65075] " jakub at gcc dot gnu.org
2015-02-16 10:18 ` rguenth at gcc dot gnu.org
2015-02-16 13:56 ` paolo.carlini at oracle dot com
2015-02-16 13:59 ` jakub at gcc dot gnu.org
2015-02-17 8:26 ` jakub at gcc dot gnu.org
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