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* [Bug c++/58105] New: wrong code generation for multiversioned functions
@ 2013-08-08 16:13 bernd.edlinger at hotmail dot de
  2013-08-10  9:30 ` [Bug target/58105] " bernd.edlinger at hotmail dot de
                   ` (5 more replies)
  0 siblings, 6 replies; 7+ messages in thread
From: bernd.edlinger at hotmail dot de @ 2013-08-08 16:13 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58105

            Bug ID: 58105
           Summary: wrong code generation for multiversioned functions
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bernd.edlinger at hotmail dot de

the following test cases fail on i686-*:
g++.dg/ext/mv2.C
g++.dg/ext/mv5.C
g++.dg/ext/mv12.C

The code is OK on -O0, -O1, but fails on -O2 and -O3.

The problem seems to be that for multiversioned functions 
an internal dispatcher function is generated by
ix86_generate_version_dispatcher_body(), which is being inlined in -O2
and above.

But the inlined function does no longer call the target-specific function.
Instead the return value is the address of the target-specific function.


^ permalink raw reply	[flat|nested] 7+ messages in thread
* [Bug target/58105] wrong code generation for multiversioned functions
  2013-08-08 16:13 [Bug c++/58105] New: wrong code generation for multiversioned functions bernd.edlinger at hotmail dot de
@ 2013-08-10  9:30 ` bernd.edlinger at hotmail dot de
  2013-08-11  0:28 ` bernd.edlinger at hotmail dot de
                   ` (4 subsequent siblings)
  5 siblings, 0 replies; 7+ messages in thread
From: bernd.edlinger at hotmail dot de @ 2013-08-10  9:30 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58105

Bernd Edlinger <bernd.edlinger at hotmail dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |i686*-*-*
          Component|c++                         |target

--- Comment #1 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
That is a pretty weird bug!

The backend generates a resolver function and an ifunc stub.
but the tree is somehow complete wrong.
Everything is good, until the optimizer inlines the resolver function
instead of the call to the ifunc stub.


^ permalink raw reply	[flat|nested] 7+ messages in thread
* [Bug target/58105] wrong code generation for multiversioned functions
  2013-08-08 16:13 [Bug c++/58105] New: wrong code generation for multiversioned functions bernd.edlinger at hotmail dot de
  2013-08-10  9:30 ` [Bug target/58105] " bernd.edlinger at hotmail dot de
@ 2013-08-11  0:28 ` bernd.edlinger at hotmail dot de
  2013-08-14  1:19 ` bernd.edlinger at hotmail dot de
                   ` (3 subsequent siblings)
  5 siblings, 0 replies; 7+ messages in thread
From: bernd.edlinger at hotmail dot de @ 2013-08-11  0:28 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58105

--- Comment #2 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
OK, this seems seems to be a possible fix:

--- i386.c.jj   2013-07-23 17:56:37.000000000 +0200
+++ i386.c      2013-08-11 01:41:38.000000000 +0200
@@ -29830,7 +29830,7 @@
   DECL_IGNORED_P (decl) = 0;
   /* IFUNC resolvers have to be externally visible.  */
   TREE_PUBLIC (decl) = 1;
-  DECL_UNINLINABLE (decl) = 0;
+  DECL_UNINLINABLE (decl) = 1;

   /* Resolver is not external, body is generated.  */
   DECL_EXTERNAL (decl) = 0;


^ permalink raw reply	[flat|nested] 7+ messages in thread
* [Bug target/58105] wrong code generation for multiversioned functions
  2013-08-08 16:13 [Bug c++/58105] New: wrong code generation for multiversioned functions bernd.edlinger at hotmail dot de
  2013-08-10  9:30 ` [Bug target/58105] " bernd.edlinger at hotmail dot de
  2013-08-11  0:28 ` bernd.edlinger at hotmail dot de
@ 2013-08-14  1:19 ` bernd.edlinger at hotmail dot de
  2013-08-14 15:01 ` bernd.edlinger at hotmail dot de
                   ` (2 subsequent siblings)
  5 siblings, 0 replies; 7+ messages in thread
From: bernd.edlinger at hotmail dot de @ 2013-08-14  1:19 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58105

--- Comment #3 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Patch was posted here: http://gcc.gnu.org/ml/gcc-patches/2013-08/msg00770.html


^ permalink raw reply	[flat|nested] 7+ messages in thread
* [Bug target/58105] wrong code generation for multiversioned functions
  2013-08-08 16:13 [Bug c++/58105] New: wrong code generation for multiversioned functions bernd.edlinger at hotmail dot de
                   ` (2 preceding siblings ...)
  2013-08-14  1:19 ` bernd.edlinger at hotmail dot de
@ 2013-08-14 15:01 ` bernd.edlinger at hotmail dot de
  2013-08-15  8:27 ` ubizjak at gmail dot com
  2013-08-16 13:24 ` ubizjak at gmail dot com
  5 siblings, 0 replies; 7+ messages in thread
From: bernd.edlinger at hotmail dot de @ 2013-08-14 15:01 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58105

--- Comment #4 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Sorry to bother you...

With Richard's E-mail today he approved this patch.
Could you as i386-port maintainer please do the check-in for me?

Thanks.


^ permalink raw reply	[flat|nested] 7+ messages in thread
* [Bug target/58105] wrong code generation for multiversioned functions
  2013-08-08 16:13 [Bug c++/58105] New: wrong code generation for multiversioned functions bernd.edlinger at hotmail dot de
                   ` (3 preceding siblings ...)
  2013-08-14 15:01 ` bernd.edlinger at hotmail dot de
@ 2013-08-15  8:27 ` ubizjak at gmail dot com
  2013-08-16 13:24 ` ubizjak at gmail dot com
  5 siblings, 0 replies; 7+ messages in thread
From: ubizjak at gmail dot com @ 2013-08-15  8:27 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58105

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
Hello!

I am away from my keyboard for a couple of days, but I will take care
of your patch.

Thanks,
Uros.

On Wed, Aug 14, 2013 at 5:01 PM, bernd.edlinger at hotmail dot de
<gcc-bugzilla@gcc.gnu.org> wrote:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58105
>
> --- Comment #4 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
> Sorry to bother you...
>
> With Richard's E-mail today he approved this patch.
> Could you as i386-port maintainer please do the check-in for me?
>
> Thanks.
>
> --
> You are receiving this mail because:
> You are on the CC list for the bug.
>From gcc-bugs-return-427881-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 15 12:04:55 2013
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug regression/58165] [4.8/4.9 regression] internal compiler error: verify_flow_info
Date: Thu, 15 Aug 2013 12:04:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX165

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-08-15
                 CC|                            |jakub at gcc dot gnu.org
   Target Milestone|---                         |4.8.2
     Ever confirmed|0                           |1

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Sounds like call-cdce bug to me.
Reduced testcase:
extern "C" float sqrtf (float);

struct A
{
  A ();
  ~A ();
};

void
foo (double d)
{
  A a;
  sqrtf (d);
}


^ permalink raw reply	[flat|nested] 7+ messages in thread
* [Bug target/58105] wrong code generation for multiversioned functions
  2013-08-08 16:13 [Bug c++/58105] New: wrong code generation for multiversioned functions bernd.edlinger at hotmail dot de
                   ` (4 preceding siblings ...)
  2013-08-15  8:27 ` ubizjak at gmail dot com
@ 2013-08-16 13:24 ` ubizjak at gmail dot com
  5 siblings, 0 replies; 7+ messages in thread
From: ubizjak at gmail dot com @ 2013-08-16 13:24 UTC (permalink / raw)
  To: gcc-bugs

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58105

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                URL|                            |http://gcc.gnu.org/ml/gcc-p
                   |                            |atches/2013-08/msg00770.htm
                   |                            |l
         Resolution|---                         |FIXED
   Target Milestone|---                         |4.9.0

--- Comment #6 from Uroš Bizjak <ubizjak at gmail dot com> ---
Author: uros
Date: Fri Aug 16 13:22:36 2013
New Revision: 201790

URL: http://gcc.gnu.org/viewcvs?rev=201790&root=gcc&view=rev
Log:
    PR target/58105
    * config/i386/i386.c (make_resolver_func): Set DECL_UNINLINABLE.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
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Subject: [Bug target/58105] wrong code generation for multiversioned functions
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58105

--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> ---
Fixed.
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From: "galtgendo at o2 dot pl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58174] New: gcc miscompiles code
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX174

            Bug ID: 58174
           Summary: gcc miscompiles code
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: galtgendo at o2 dot pl

Created attachment 30665
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id0665&actioníit
preprocessed file that miscompiles

Using built-in specs.
COLLECT_GCC=gcc-4.8.1
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.8.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-4.8.1/work/gcc-4.8.1/configure
--prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.8.1
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.1/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.8.1
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.8.1/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.8.1/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.1/include/g++-v4
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec
--disable-fixed-point --with-cloog --disable-isl-version-check --enable-lto
--enable-nls --without-included-gettext --with-system-zlib --enable-obsolete
--disable-werror --enable-secureplt --enable-multilib
--with-multilib-list=m32,m64 --enable-libmudflap --disable-libssp
--enable-libgomp
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.8.1/python
--enable-checking=release --disable-libgcj --enable-libstdcxx-time
--enable-objc-gc --enable-languages=c,c++,objc,fortran --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--enable-targets=all --with-bugurl=http://bugs.gentoo.org/
--with-pkgversion='Gentoo 4.8.1 p1.0, pie-0.5.6' --disable-libstdcxx-pch
Thread model: posix
gcc version 4.8.1 (Gentoo 4.8.1 p1.0, pie-0.5.6)

The command:
gc -DHAVE_INTTYPES=1 -O2 -Wall -Wextra -I/usr/include/SDL -I/usr/include/AL
-I/usr/include/libmodplug -o snd_flac.o -c snd_flac.cpp

Notes:
- even '-O' triggers the bug
- at '-O2', for whatever the reason, '-fno-guess-branch-probability' makes
things work


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2013-08-08 16:13 [Bug c++/58105] New: wrong code generation for multiversioned functions bernd.edlinger at hotmail dot de
2013-08-10  9:30 ` [Bug target/58105] " bernd.edlinger at hotmail dot de
2013-08-11  0:28 ` bernd.edlinger at hotmail dot de
2013-08-14  1:19 ` bernd.edlinger at hotmail dot de
2013-08-14 15:01 ` bernd.edlinger at hotmail dot de
2013-08-15  8:27 ` ubizjak at gmail dot com
2013-08-16 13:24 ` ubizjak at gmail dot com

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