[Bug c++/37539] New: Hang for -O3

[Bug c++/37539] New: Hang for -O3

[dcb314 at hotmail dot com]

I just tried to compile the Suse Linux package liboil-0.3.14-17
with the most recent snapshot of gcc version 4.4, dated 20080912.

The compiler said

 gcc -DHAVE_CONFIG_H -I. -I../.. -Wall -D_BSD_SOURCE -D_GNU_SOURCE -I../..
-DOIL_ENABLE_UNSTABLE_API -O3 -g -fmessage-length=0 -D_FORTIFY_SOURCE=2 -MT
libref_la-yuv.lo -MD -MP -MF .deps/libref_la-yuv.Tpo -c yuv.c  -fPIC -DPIC -o
.libs/libref_la-yuv.o
yuv.c:145: warning: missing initializer
yuv.c:145: warning: (near initialization for
'_oil_function_impl_yuyv2ayuv_ref.profile_ave')
yuv.c:161: warning: missing initializer
yuv.c:161: warning: (near initialization for
'_oil_function_impl_yvyu2ayuv_ref.profile_ave')
yuv.c:177: warning: missing initializer
yuv.c:177: warning: (near initialization for
'_oil_function_impl_uyvy2ayuv_ref.profile_ave')
yuv.c:200: warning: missing initializer
yuv.c:200: warning: (near initialization for
'_oil_function_impl_ayuv2yuyv_ref.profile_ave')
yuv.c:221: warning: missing initializer
yuv.c:221: warning: (near initialization for
'_oil_function_impl_ayuv2yvyu_ref.profile_ave')
yuv.c:242: warning: missing initializer
yuv.c:242: warning: (near initialization for
'_oil_function_impl_ayuv2uyvy_ref.profile_ave')
yuv.c:257: warning: missing initializer
yuv.c:257: warning: (near initialization for
'_oil_function_impl_packyuyv_ref.profile_ave')
yuv.c:272: warning: missing initializer
yuv.c:272: warning: (near initialization for
'_oil_function_impl_unpackyuyv_ref.profile_ave')

and proceeded to hang an otherwise idle machine for half an hour.

Preprocessed source code attached. Flag -O3 required to cause the hang.
Changing the -O3 flag to -O2 caused the file to compile in half a second.


-- 
           Summary: Hang for -O3
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dcb314 at hotmail dot com
  GCC host triplet: suse-linux-x86_64


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37539

[Bug c++/37539] Hang for -O3

[dcb314 at hotmail dot com]

------- Comment #1 from dcb314 at hotmail dot com  2008-09-16 08:18 -------
Created an attachment (id=16336)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16336&action=view)
C source code


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37539

[Bug c++/37539] Hang for -O3

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2008-09-16 13:14 -------
There's a dup for this.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37539

[Bug tree-optimization/37539] Hang for -O3

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2008-09-16 16:36 -------
It is hanging in vectorizable_load. 


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c++                         |tree-optimization


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37539

[Bug tree-optimization/37539] Hang for -O3

[irar at il dot ibm dot com]

------- Comment #4 from irar at il dot ibm dot com  2008-09-18 07:26 -------
Reduced testcase:

typedef struct _OilFunctionImpl OilFunctionImpl;

struct _OilFunctionImpl {
 void *func;
};

static void
ayuv2yuyv_ref (int *d, int *src, int n)
{
  char *dest = (char *)d;
  int i;

  for(i=0;i<n/2;i++){
    dest[i*4 + 0] = (((src[i*2 + 0])>>16)&0xff);
    dest[i*4 + 1] = ((((src[i*2 + 0])>>8)&0xff) + (((src[i*2] +
1)>>8)&0xff))/2;
    dest[i*4 + 2] = (((src[i*2 + 1])>>16)&0xff);
    dest[i*4 + 3] = ((((src[i*2 + 0])>>0)&0xff) + (((src[i*2] +
1)>>0)&0xff))/2;
  }
}

OilFunctionImpl _oil_function_impl_ayuv2yuyv_ref = {(void *)ayuv2yuyv_ref};


-- 

irar at il dot ibm dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-09-18 07:26:21
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37539

[Bug tree-optimization/37539] Hang for -O3

[irar at il dot ibm dot com]

-- 

irar at il dot ibm dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |irar at il dot ibm dot com
                   |dot org                     |
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2008-09-18 07:26:21         |2008-09-18 08:43:27
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37539

[Bug tree-optimization/37539] [4.4 Regression] Hang for -O3

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |compile-time-hog
            Summary|Hang for -O3                |[4.4 Regression] Hang for -
                   |                            |O3
   Target Milestone|---                         |4.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37539

[Bug tree-optimization/37539] [4.4 Regression] Hang for -O3

[irar at gcc dot gnu dot org]

------- Comment #5 from irar at gcc dot gnu dot org  2008-09-21 08:37 -------
Subject: Bug 37539

Author: irar
Date: Sun Sep 21 08:36:07 2008
New Revision: 140522

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=140522
Log:
        PR tree-optimization/37539
        * tree-vect-transform.c (vect_transform_strided_load): Save vector
        statement in related statement field only for the first load of the
        group of loads with the same data reference.


Added:
    trunk/gcc/testsuite/gcc.dg/vect/pr37539.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-transform.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37539

[Bug tree-optimization/37539] [4.4 Regression] Hang for -O3

[irar at gcc dot gnu dot org]

------- Comment #6 from irar at gcc dot gnu dot org  2008-09-21 08:52 -------
Subject: Bug 37539

Author: irar
Date: Sun Sep 21 08:51:01 2008
New Revision: 140523

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=140523
Log:

        PR tree-optimization/37539
        * tree-vect-transform.c (vect_transform_strided_load): Save vector
        statement in related statement field only for the first load of the
        group of loads with the same data reference.



Modified:
    branches/gcc-4_3-branch/gcc/ChangeLog
    branches/gcc-4_3-branch/gcc/tree-vect-transform.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37539

[Bug tree-optimization/37539] [4.4 Regression] Hang for -O3

[jakub at gcc dot gnu dot org]

------- Comment #7 from jakub at gcc dot gnu dot org  2008-09-24 03:24 -------
Fixed.


-- 

jakub at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37539