[Bug tree-optimization/65318] New: wrong code at -Os and above on x86_64-linux-gnu

[Bug tree-optimization/65318] New: wrong code at -Os and above on x86_64-linux-gnu

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65318

            Bug ID: 65318
           Summary: wrong code at -Os and above on x86_64-linux-gnu
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

The current gcc trunk miscompiles the following code on x86_64-linux at -Os and
above in both 32-bit and 64-bit modes. 

This is a regression from 4.9.x. 

$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 5.0.0 20150304 (experimental) [trunk revision 221192] (GCC) 
$ 
$ gcc-trunk -O1 small.c; ./a.out
$ gcc-4.9.2 -Os small.c; ./a.out
$ 
$ gcc-trunk -Os small.c
$ ./a.out
0
$ 


---------------------------------


int printf(const char *, ...); 

static short a = 0;
short b = -1; 
static unsigned short c = 0;

int
main ()
{
  if (a <= b) 
    printf ("%d\n", c);
  return 0;
}

[Bug ipa/65318] [5 Regression] wrong code at -Os and above on x86_64-linux-gnu

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65318

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-03-05
                 CC|                            |mpolacek at gcc dot gnu.org
          Component|tree-optimization           |ipa
   Target Milestone|---                         |5.0
            Summary|wrong code at -Os and above |[5 Regression] wrong code
                   |on x86_64-linux-gnu         |at -Os and above on
                   |                            |x86_64-linux-gnu
     Ever confirmed|0                           |1

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed, and ICF issue.  Started with r221099.

[Bug ipa/65318] [5 Regression] wrong code at -Os and above on x86_64-linux-gnu

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65318

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1

[Bug ipa/65318] [5 Regression] wrong code at -Os and above on x86_64-linux-gnu

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65318

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 34962
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34962&action=edit
Suggested patch
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From: "scerveau@connected-labs.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/65325] New: float/interger operation needs cast with 02 switch.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide325

            Bug ID: 65325
           Summary: float/interger operation needs cast with 02 switch.
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: scerveau@connected-labs.com

A bug has been reported to gstreamer bug tracker:

https://bugzilla.gnome.org/show_bug.cgi?idt5667

This bug seems to be related to gcc optimization behaviour. The operations
needs specific cast for operation with double and integers.

[Bug ipa/65318] [5 Regression] wrong code at -Os and above on x86_64-linux-gnu

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65318

--- Comment #3 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Author: hubicka
Date: Thu Mar  5 17:49:49 2015
New Revision: 221221

URL: https://gcc.gnu.org/viewcvs?rev=221221&root=gcc&view=rev
Log:
    PR ipa/65318
    * ipa-icf.c (sem_variable::equals): Compare variables types.
    * gcc.dg/ipa/pr65318.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/ipa/pr65318.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/ipa-icf.c
    trunk/gcc/testsuite/ChangeLog

[Bug ipa/65318] [5 Regression] wrong code at -Os and above on x86_64-linux-gnu

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65318

Jan Hubicka <hubicka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Fixed.