[Bug middle-end/59273] New: [4.9 Regression] ICE in expand_expr_real_2, at expr.c:9188 on alpha

[Bug middle-end/59273] New: [4.9 Regression] ICE in expand_expr_real_2, at expr.c:9188 on alpha

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59273

            Bug ID: 59273
           Summary: [4.9 Regression] ICE in expand_expr_real_2, at
                    expr.c:9188 on alpha
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ubizjak at gmail dot com

Recent change introduced following new testsuite failure (and several others)
on alpha-linux-gnu [1]:

FAIL: gcc.dg/torture/pr46723.c  -O3 -fomit-frame-pointer  (internal compiler
error)
FAIL: gcc.dg/torture/pr46723.c  -O3 -fomit-frame-pointer  (test for excess
errors)
...

The failure can be triggered on a crosscompiler from x86_64 to alpha-linux-gnu:

$ gcc-build-alpha/gcc/cc1 -O3 -fpreprocessed pr46723.c

pr46723.c: In function ‘test’:
pr46723.c:4:6: internal compiler error: in expand_expr_real_2, at expr.c:9188
 void test()
      ^
0x6beb38 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
        /home/uros/gcc-svn/trunk/gcc/expr.c:9188
0x5e8ed9 expand_gimple_stmt_1
        /home/uros/gcc-svn/trunk/gcc/cfgexpand.c:3235
0x5e8ed9 expand_gimple_stmt
        /home/uros/gcc-svn/trunk/gcc/cfgexpand.c:3295
0x5eafda expand_gimple_basic_block
        /home/uros/gcc-svn/trunk/gcc/cfgexpand.c:5135
0x5ecf3c gimple_expand_cfg
        /home/uros/gcc-svn/trunk/gcc/cfgexpand.c:5701
0x5ecf3c execute
        /home/uros/gcc-svn/trunk/gcc/cfgexpand.c:5921
Please submit a full bug report,

(gdb) up
#2  0x00000000006beb39 in expand_expr_real_2 (ops=ops@entry=0x7fffffffd9b0,
target=0x7ffff19c5100, tmode=<optimized out>,
modifier=modifier@entry=EXPAND_NORMAL)
    at /home/uros/gcc-svn/trunk/gcc/expr.c:9188
9188      gcc_assert (temp);
(gdb) list
9183     binop3:
9184      if (modifier == EXPAND_STACK_PARM)
9185        target = 0;
9186      temp = expand_binop (mode, this_optab, op0, op1, target,
9187                           unsignedp, OPTAB_LIB_WIDEN);
9188      gcc_assert (temp);
9189      /* Bitwise operations do not need bitfield reduction as we expect
their
9190         operands being properly truncated.  */
9191      if (code == BIT_XOR_EXPR
9192          || code == BIT_AND_EXPR

(gdb) p debug_rtx (target)
(reg:V4HI 130 [ vect_vec_iv_.17 ])
$1 = void
(gdb) p debug_rtx (op0)
(reg:V4HI 174 [ D.1496 ])
$2 = void
(gdb) p debug_rtx (op1)
(const_vector:V4HI [
        (const_int 0 [0])
        (const_int 1 [0x1])
        (const_int 2 [0x2])
        (const_int 3 [0x3])
    ])
$3 = void
(gdb) p code
$4 = PLUS_EXPR

The compiler is trying to blindly generate V4HImode vector addition without
checking if the target supports it (alpha doesn't, while it supports V4HImode
moves).

[1] http://gcc.gnu.org/ml/gcc-testresults/2013-11/msg01763.html
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Subject: [Bug middle-end/59273] [4.9 Regression] ICE in expand_expr_real_2, at expr.c:9188 on alpha
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59273

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |alpha-linux-gnu
   Target Milestone|---                         |4.9.0
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX893

--- Comment #5 from Markus Trippelsdorf <octoploid at yandex dot com> ---
=700== Conditional jump or move depends on uninitialised value(s)
=700==    at 0xDCB562: diagnostic_report_current_module(diagnostic_context*,
unsigned int) (diagnostic.c:506)
=700==    by 0x58DB6D: cp_diagnostic_starter(diagnostic_context*,
diagnostic_info*) (error.c:3025)
=700==    by 0xDCC1E8: diagnostic_report_diagnostic(diagnostic_context*,
diagnostic_info*) (diagnostic.c:791)
=700==    by 0x6551D4: c_cpp_error(cpp_reader*, int, int, unsigned int,
unsigned int, char const*, __va_list_tag (*) [1]) (c-common.c:9665)
=700==    by 0xDD9AB8: cpp_diagnostic(cpp_reader*, int, int, char const*,
__va_list_tag (*) [1]) (errors.c:63)
=700==    by 0xDD9C06: cpp_error(cpp_reader*, int, char const*, ...)
(errors.c:78)
=700==    by 0xDDF152: _cpp_find_file (files.c:571)
=700==    by 0xDDF71E: _cpp_stack_include (files.c:993)
=700==    by 0x6657D5: push_command_line_include() (c-opts.c:1372)
=700==    by 0xDE18E5: _cpp_get_fresh_line.part.6 (lex.c:2134)
=700==    by 0xDE3A58: _cpp_lex_direct (lex.c:2104)
=700==    by 0xDE490B: _cpp_lex_token (lex.c:2055)
=700==  Uninitialised value was created by a heap allocation
=700==    at 0x40274F0: malloc (vg_replace_malloc.c:291)
=700==    by 0xE0F557: xmalloc (xmalloc.c:147)
=700==    by 0xDE1DDA: _cpp_init_tokenrun (lex.c:1901)
=700==    by 0xDE0653: cpp_create_reader(c_lang, ht*, line_maps*)
(init.c:236)
=700==    by 0x665C7C: c_common_init_options(unsigned int,
cl_decoded_option*) (c-opts.c:215)
=700==    by 0x93E854: toplev_main(int, char**) (toplev.c:1947)
=700==    by 0x4ED5FD2: (below main) (in /lib64/libc-2.18.90.so)
=700==700== Conditional jump or move depends on uninitialised value(s)
=700==    at 0xDCF7FE: expand_location_1(unsigned int, bool) (input.c:55)
=700==    by 0xDCFA5A: expand_location_to_spelling_point(unsigned int)
(input.c:162)
=700==    by 0xDCBC28: diagnostic_build_prefix(diagnostic_context*,
diagnostic_info const*) (diagnostic.c:239)
=700==    by 0x58DC7F: cp_diagnostic_starter(diagnostic_context*,
diagnostic_info*) (error.c:3030)
=700==    by 0xDCC1E8: diagnostic_report_diagnostic(diagnostic_context*,
diagnostic_info*) (diagnostic.c:791)
=700==    by 0x6551D4: c_cpp_error(cpp_reader*, int, int, unsigned int,
unsigned int, char const*, __va_list_tag (*) [1]) (c-common.c:9665)
=700==    by 0xDD9AB8: cpp_diagnostic(cpp_reader*, int, int, char const*,
__va_list_tag (*) [1]) (errors.c:63)
=700==    by 0xDD9C06: cpp_error(cpp_reader*, int, char const*, ...)
(errors.c:78)
=700==    by 0xDDF152: _cpp_find_file (files.c:571)
=700==    by 0xDDF71E: _cpp_stack_include (files.c:993)
=700==    by 0x6657D5: push_command_line_include() (c-opts.c:1372)
=700==    by 0xDE18E5: _cpp_get_fresh_line.part.6 (lex.c:2134)
=700==  Uninitialised value was created by a heap allocation
=700==    at 0x40274F0: malloc (vg_replace_malloc.c:291)
=700==    by 0xE0F557: xmalloc (xmalloc.c:147)
=700==    by 0xDE1DDA: _cpp_init_tokenrun (lex.c:1901)
=700==    by 0xDE0653: cpp_create_reader(c_lang, ht*, line_maps*)
(init.c:236)
=700==    by 0x665C7C: c_common_init_options(unsigned int,
cl_decoded_option*) (c-opts.c:215)
=700==    by 0x93E854: toplev_main(int, char**) (toplev.c:1947)
=700==    by 0x4ED5FD2: (below main) (in /lib64/libc-2.18.90.so)
=700==700== Conditional jump or move depends on uninitialised value(s)
=700==    at 0xDCF841: expand_location_1(unsigned int, bool) (input.c:63)
=700==    by 0xDCFA5A: expand_location_to_spelling_point(unsigned int)
(input.c:162)
=700==    by 0xDCBC28: diagnostic_build_prefix(diagnostic_context*,
diagnostic_info const*) (diagnostic.c:239)
=700==    by 0x58DC7F: cp_diagnostic_starter(diagnostic_context*,
diagnostic_info*) (error.c:3030)
=700==    by 0xDCC1E8: diagnostic_report_diagnostic(diagnostic_context*,
diagnostic_info*) (diagnostic.c:791)
=700==    by 0x6551D4: c_cpp_error(cpp_reader*, int, int, unsigned int,
unsigned int, char const*, __va_list_tag (*) [1]) (c-common.c:9665)
=700==    by 0xDD9AB8: cpp_diagnostic(cpp_reader*, int, int, char const*,
__va_list_tag (*) [1]) (errors.c:63)
=700==    by 0xDD9C06: cpp_error(cpp_reader*, int, char const*, ...)
(errors.c:78)
=700==    by 0xDDF152: _cpp_find_file (files.c:571)
=700==    by 0xDDF71E: _cpp_stack_include (files.c:993)
=700==    by 0x6657D5: push_command_line_include() (c-opts.c:1372)
=700==    by 0xDE18E5: _cpp_get_fresh_line.part.6 (lex.c:2134)
=700==  Uninitialised value was created by a heap allocation
=700==    at 0x40274F0: malloc (vg_replace_malloc.c:291)
=700==    by 0xE0F557: xmalloc (xmalloc.c:147)
=700==    by 0xDE1DDA: _cpp_init_tokenrun (lex.c:1901)
=700==    by 0xDE0653: cpp_create_reader(c_lang, ht*, line_maps*)
(init.c:236)
=700==    by 0x665C7C: c_common_init_options(unsigned int,
cl_decoded_option*) (c-opts.c:215)
=700==    by 0x93E854: toplev_main(int, char**) (toplev.c:1947)
=700==    by 0x4ED5FD2: (below main) (in /lib64/libc-2.18.90.so)
....

[Bug middle-end/59273] [4.9 Regression] ICE in expand_expr_real_2, at expr.c:9188 on alpha

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59273

--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Uroš Bizjak from comment #1)
> The failure was introduced by r205244:

Ops, r205240.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59273

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-11-24
                 CC|                            |jakub at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
The failure was introduced by r205244:

Author: jakub
Date: Fri Nov 22 00:41:38 2013
New Revision: 205240

URL: http://gcc.gnu.org/viewcvs?rev=205240&root=gcc&view=rev
Log:
    * tree-vect-generic.c (optimize_vector_constructor): New function.
    (expand_vector_operations_1): Call it.

    * gcc.dg/vect/vect-124.c: New test.

Author CC'd.
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H.J. Lu <hjl.tools at gmail dot com> changed:

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[Bug middle-end/59273] [4.9 Regression] ICE in expand_expr_real_2, at expr.c:9188 on alpha

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59273

Richard Biener <rguenth at gcc dot gnu.org> changed:

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

[Bug middle-end/59273] [4.9 Regression] ICE in expand_expr_real_2, at expr.c:9188 on alpha

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59273

--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #3)
> Created attachment 31293 [details]
> gcc49-pr59273.patch
> 
> Untested fix.

I have started a native bootstrap + regtest on alpha.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY286

--- Comment #7 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> ---
(In reply to Kostya Serebryany from comment #5)
> Maybe let's do some remote debugging then :)

For the current setup, the crash is always in StackDepotGet

The following printfs:

    StackDesc *s = (StackDesc*)(v & ~1);
    printf("Getting %p\n",s);
    for (; s; s = s->link) {
      if (s->id == id) {
        *size = s->size;
        return s->stack;
      }
      printf("Following %p\n",s->link);
    }

Always crash at an output like:
Getting (nil)
Getting 0x7ffff0305eb0
Following 0xc004832c00002

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff0461100 (LWP 24991)]
0x00007ffff35ae4e0 in __sanitizer::StackDepotGet (id@30474480, size=0x0) at
../../../../gcc/libsanitizer/sanitizer_common/sanitizer_stackdepot.cc:196
196          if (s->id == id) {
(gdb) print s
$2 = (__sanitizer::StackDesc *) 0xc004832c00002

so the s->link field containing something unexpected.

[Bug middle-end/59273] [4.9 Regression] ICE in expand_expr_real_2, at expr.c:9188 on alpha

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59273

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Nov 26 20:55:39 2013
New Revision: 205414

URL: http://gcc.gnu.org/viewcvs?rev=205414&root=gcc&view=rev
Log:
    PR middle-end/59273
    * tree-vect-generic.c (optimize_vector_constructor): Don't optimize
    if there isn't optab handler for the corresponding vector PLUS_EXPR.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-vect-generic.c

[Bug middle-end/59273] [4.9 Regression] ICE in expand_expr_real_2, at expr.c:9188 on alpha

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59273

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

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

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.

[Bug middle-end/59273] [4.9 Regression] ICE in expand_expr_real_2, at expr.c:9188 on alpha

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59273

--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #6)
> Fixed.

I can confirm the fix on native alpha bootstrap [1].

[1] http://gcc.gnu.org/ml/gcc-testresults/2013-11/msg02115.html
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Subject: [Bug debug/59323] [4.9 Regression] Int. comp. error: in add_AT_specification, at dwarf2out.c:4026
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY323

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Nov 28 15:22:55 2013
New Revision: 205487

URL: http://gcc.gnu.org/viewcvs?rev 5487&root=gcc&view=rev
Log:
2013-11-28  Richard Biener  <rguenther@suse.de>

    PR lto/59323
    * gcc.dg/lto/pr59323-2_0.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/lto/pr59323-2_0.c
Modified:
    trunk/gcc/testsuite/ChangeLog