[Bug c/36154] New: internal compiler error: in get_constraint_for_component_ref, at tree-ssa-structalias.c:2727

[Bug c/36154] New: internal compiler error: in get_constraint_for_component_ref, at tree-ssa-structalias.c:2727

[patrick at motec dot com dot au]

I'm encountering an internal compiler error with the gcc 4.3.0 release. I don't
think this is a duplicate of any other bugs.

Here is the command and subsequent output:

powerpc-eabispe-gcc -I../ -I/home/patrick/src/e7/prex
-I/home/patrick/src/e7/prex/usr/include -I/home/patrick/src/e7/prex/include
-nostdinc -fsingle-precision-constant -mabi=no-spe -gdwarf-2 -Os -ansi
-fno-strict-aliasing -Wall -Wundef -Wstrict-prototypes -Wpointer-arith
-std=gnu99 -fno-stack-protector -Wno-variadic-macros -D__ppc__ -D__e7__
-D__ARCH__=ppc -D__PLATFORM__=e7 -Uppc -Ue7 -fno-omit-frame-pointer -DDEBUG -g
-Wsign-compare -Werror-implicit-function-declaration -I../comms/lwip/include
-I../comms/lwip/prex/include -I../comms/lwip/include/ipv4 -v -save-temps
-I../include -c -o ../test/test_xcp_eth.o test_xcp_eth.c
Using built-in specs.
Target: powerpc-eabispe
Configured with: /home/patrick/src/e7/toolchain/src/gcc-4.3.0/configure
--prefix=/home/patrick/src/e7/toolchain/stage2 --build=x86_64-unknown-linux-gnu
--host=x86_64-unknown-linux-gnu --target=powerpc-eabispe --enable-languages=c
--disable-nls --disable-multilib --disable-werror --with-newlib
--disable-shared --disable-debug --disable-libssp
Thread model: single
gcc version 4.3.0 (GCC) 
COLLECT_GCC_OPTIONS='-I../' '-I/home/patrick/src/e7/prex'
'-I/home/patrick/src/e7/prex/usr/include' '-I/home/patrick/src/e7/prex/include'
'-nostdinc' '-fsingle-precision-constant' '-mabi=no-spe' '-gdwarf-2' '-Os'
'-ansi' '-fno-strict-aliasing' '-Wall' '-Wundef' '-Wstrict-prototypes'
'-Wpointer-arith' '-std=gnu99' '-fno-stack-protector' '-Wno-variadic-macros'
'-D__ppc__' '-D__e7__' '-D__ARCH__=ppc' '-D__PLATFORM__=e7' '-Uppc' '-Ue7'
'-fno-omit-frame-pointer' '-DDEBUG' '-g' '-Wsign-compare'
'-Werror-implicit-function-declaration' '-I../comms/lwip/include'
'-I../comms/lwip/prex/include' '-I../comms/lwip/include/ipv4' '-v'
'-save-temps' '-I../include' '-c' '-o' '../test/test_xcp_eth.o'
 /home/patrick/src/e7/toolchain/stage2/libexec/gcc/powerpc-eabispe/4.3.0/cc1 -E
-quiet -nostdinc -v -I../ -I/home/patrick/src/e7/prex
-I/home/patrick/src/e7/prex/usr/include -I/home/patrick/src/e7/prex/include
-I../comms/lwip/include -I../comms/lwip/prex/include
-I../comms/lwip/include/ipv4 -I../include -D__ppc__ -D__e7__ -D__ARCH__=ppc
-D__PLATFORM__=e7 -Uppc -Ue7 -DDEBUG test_xcp_eth.c -mabi=no-spe -ansi
-std=gnu99 -Wall -Wundef -Wstrict-prototypes -Wpointer-arith
-Wno-variadic-macros -Wsign-compare -Werror-implicit-function-declaration
-fsingle-precision-constant -fno-strict-aliasing -fno-stack-protector
-fno-omit-frame-pointer -fworking-directory -Os -fpch-preprocess -o
test_xcp_eth.i
#include "..." search starts here:
#include <...> search starts here:
 ../
 /home/patrick/src/e7/prex
 /home/patrick/src/e7/prex/usr/include
 /home/patrick/src/e7/prex/include
 ../comms/lwip/include
 ../comms/lwip/prex/include
 ../comms/lwip/include/ipv4
 ../include
End of search list.
COLLECT_GCC_OPTIONS='-I../' '-I/home/patrick/src/e7/prex'
'-I/home/patrick/src/e7/prex/usr/include' '-I/home/patrick/src/e7/prex/include'
'-nostdinc' '-fsingle-precision-constant' '-mabi=no-spe' '-gdwarf-2' '-Os'
'-ansi' '-fno-strict-aliasing' '-Wall' '-Wundef' '-Wstrict-prototypes'
'-Wpointer-arith' '-std=gnu99' '-fno-stack-protector' '-Wno-variadic-macros'
'-D__ppc__' '-D__e7__' '-D__ARCH__=ppc' '-D__PLATFORM__=e7' '-Uppc' '-Ue7'
'-fno-omit-frame-pointer' '-DDEBUG' '-g' '-Wsign-compare'
'-Werror-implicit-function-declaration' '-I../comms/lwip/include'
'-I../comms/lwip/prex/include' '-I../comms/lwip/include/ipv4' '-v'
'-save-temps' '-I../include' '-c' '-o' '../test/test_xcp_eth.o'
 /home/patrick/src/e7/toolchain/stage2/libexec/gcc/powerpc-eabispe/4.3.0/cc1
-fpreprocessed test_xcp_eth.i -quiet -dumpbase test_xcp_eth.c -mabi=no-spe
-ansi -auxbase-strip ../test/test_xcp_eth.o -gdwarf-2 -g -Os -Wall -Wundef
-Wstrict-prototypes -Wpointer-arith -Wno-variadic-macros -Wsign-compare
-Werror-implicit-function-declaration -ansi -std=gnu99 -version
-fsingle-precision-constant -fno-strict-aliasing -fno-stack-protector
-fno-omit-frame-pointer -o test_xcp_eth.s
GNU C (GCC) version 4.3.0 (powerpc-eabispe)
        compiled by GNU C version 4.2.3 (Ubuntu 4.2.3-2ubuntu7), GMP version
4.2.2, MPFR version 2.3.1.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: d72f763bda0b53028b002e23e9bbb24c
test_xcp_eth.c: In function 'cmd_unaligned':
test_xcp_eth.c:68: internal compiler error: in
get_constraint_for_component_ref, at tree-ssa-structalias.c:2727
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


-- 
           Summary: internal compiler error: in
                    get_constraint_for_component_ref, at tree-ssa-
                    structalias.c:2727
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: patrick at motec dot com dot au
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: powerpc-eabispe


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36154

[Bug c/36154] internal compiler error: in get_constraint_for_component_ref, at tree-ssa-structalias.c:2727

[patrick at motec dot com dot au]

------- Comment #1 from patrick at motec dot com dot au  2008-05-06 12:46 -------
Created an attachment (id=15586)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15586&action=view)
preprocessed source

preprocessed source for the file that causes the bug, as required by bug
writing guidelines!


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36154

[Bug middle-end/36154] internal compiler error: in get_constraint_for_component_ref, at tree-ssa-structalias.c:2727

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |normal


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36154

[Bug middle-end/36154] internal compiler error: in get_constraint_for_component_ref, at tree-ssa-structalias.c:2727

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2008-05-07 19:56 -------
Reducing.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36154

[Bug middle-end/36154] [4.3 Regression] internal compiler error: in get_constraint_for_component_ref, at tree-ssa-structalias.c:2727

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2008-05-07 20:04 -------
Reduced testcase, fails at -O:

struct eth_test_pkt {
  unsigned short len;
  unsigned short ctr;
  unsigned char packet[];
} __attribute__ ((packed));
struct eth_test_pkt pkt_unaligned = { .packet = { 0xFC } };
int cmd_unaligned(const void *p)
{
  return memcmp(p, pkt_unaligned.packet, 1);
}


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
  GCC build triplet|x86_64-unknown-linux-gnu    |
   GCC host triplet|x86_64-unknown-linux-gnu    |
 GCC target triplet|powerpc-eabispe             |
           Keywords|                            |ice-on-valid-code
      Known to fail|                            |4.3.0
      Known to work|                            |4.2.3 4.4.0
   Last reconfirmed|0000-00-00 00:00:00         |2008-05-07 20:04:30
               date|                            |
            Summary|internal compiler error: in |[4.3 Regression] internal
                   |get_constraint_for_component|compiler error: in
                   |_ref, at tree-ssa-          |get_constraint_for_component
                   |structalias.c:2727          |_ref, at tree-ssa-
                   |                            |structalias.c:2727
   Target Milestone|---                         |4.3.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36154

[Bug middle-end/36154] [4.3 Regression] internal compiler error: in get_constraint_for_component_ref, at tree-ssa-structalias.c:2727

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2008-05-07 20:07 -------
We don't generate _any_ fields for packet, but the memcmp is folded to

<bb 2>:
  p.0_2 = (const unsigned char * {ref-all}) p_1(D);
  D.1186_3 = *p.0_2;
  D.1187_4 = (int) D.1186_3;
  D.1188_5 = (const unsigned char * {ref-all}) &pkt_unaligned.packet;
  D.1189_6 = *D.1188_5;
  D.1190_7 = (int) D.1189_6;
  D.1184_8 = D.1187_4 - D.1190_7;
  return D.1184_8;

taking the address of the missing field.  This has gone "latent" on the
trunk by not generating subvariables for PTA anymore.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |rguenth at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2008-05-07 20:04:30         |2008-05-07 20:07:19
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36154

[Bug middle-end/36154] [4.3 Regression] internal compiler error: in get_constraint_for_component_ref, at tree-ssa-structalias.c:2727

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2008-05-08 08:21 -------
Subject: Bug 36154

Author: rguenth
Date: Thu May  8 08:20:45 2008
New Revision: 135071

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=135071
Log:
2008-05-08  Richard Guenther  <rguenther@suse.de>

        PR middle-end/36154
        * tree-ssa-structalias.c (push_fields_onto_fieldstack): Make
        sure to create a representative for trailing arrays for PTA.

        * gcc.c-torture/compile/pr36154.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/pr36154.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-structalias.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36154

[Bug middle-end/36154] [4.3 Regression] internal compiler error: in get_constraint_for_component_ref, at tree-ssa-structalias.c:2727

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2008-05-08 08:24 -------
Subject: Bug 36154

Author: rguenth
Date: Thu May  8 08:23:59 2008
New Revision: 135072

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=135072
Log:
2008-05-08  Richard Guenther  <rguenther@suse.de>

        PR middle-end/36154
        * tree-ssa-structalias.c (push_fields_onto_fieldstack): Make
        sure to create a representative for trailing arrays for PTA.

        * gcc.c-torture/compile/pr36154.c: New testcase.

2008-05-08  Richard Guenther  <rguenther@suse.de>

        PR middle-end/36172
        * fold-const.c (operand_equal_p): Two objects which types
        differ in pointerness are not equal.

        * gcc.c-torture/compile/pr36172.c: New testcase.

Added:
    branches/gcc-4_3-branch/gcc/testsuite/gcc.c-torture/compile/pr36154.c
      - copied unchanged from r135071,
trunk/gcc/testsuite/gcc.c-torture/compile/pr36154.c
    branches/gcc-4_3-branch/gcc/testsuite/gcc.c-torture/compile/pr36172.c
      - copied unchanged from r135071,
trunk/gcc/testsuite/gcc.c-torture/compile/pr36172.c
Modified:
    branches/gcc-4_3-branch/gcc/ChangeLog
    branches/gcc-4_3-branch/gcc/fold-const.c
    branches/gcc-4_3-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_3-branch/gcc/tree-ssa-structalias.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36154

[Bug middle-end/36154] [4.3 Regression] internal compiler error: in get_constraint_for_component_ref, at tree-ssa-structalias.c:2727

[rguenth at gcc dot gnu dot org]

------- Comment #7 from rguenth at gcc dot gnu dot org  2008-05-08 08:29 -------
Fixed.


-- 

rguenth at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36154