[Bug middle-end/55943] New: ICE in gen_reg_rtx

[Bug middle-end/55943] New: ICE in gen_reg_rtx

[schwab@linux-m68k.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

             Bug #: 55943
           Summary: ICE in gen_reg_rtx
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: schwab@linux-m68k.org
            Target: ia64-*-*


Created attachment 29150
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29150
Testcase

$ gcc-20130111/Build/gcc/xgcc -B gcc-20130111/Build/gcc/ -S
gcc/gcc/testsuite/gcc.c-torture/compile/pr55921.c 
gcc/gcc/testsuite/gcc.c-torture/compile/pr55921.c: In function ‘foo’:
gcc/gcc/testsuite/gcc.c-torture/compile/pr55921.c:21:1: internal compiler
error: in gen_reg_rtx, at emit-rtl.c:866
 }
 ^
0x400000000040012f gen_reg_rtx(machine_mode)
        ../../gcc/emit-rtl.c:866
0x4000000000432f1f store_bit_field_1
        ../../gcc/expmed.c:776
0x4000000000433b9f store_bit_field(rtx_def*, unsigned long, unsigned long,
unsigned long, unsigned long, machine_mode, rtx_def*)
        ../../gcc/expmed.c:897
0x400000000045f40f write_complex_part
        ../../gcc/expr.c:2960
0x400000000045f6bf emit_move_complex_parts(rtx_def*, rtx_def*)
        ../../gcc/expr.c:3216
0x4000000000718dff gen_move_insn(rtx_def*, rtx_def*)
        ../../gcc/optabs.c:4783
0x40000000007f752f gen_reload
        ../../gcc/reload1.c:8705
0x40000000008077af emit_input_reload_insns
        ../../gcc/reload1.c:7591
0x40000000008077af do_input_reload
        ../../gcc/reload1.c:7877
0x40000000008077af emit_reload_insns
        ../../gcc/reload1.c:8069
0x40000000008077af reload_as_needed
        ../../gcc/reload1.c:4645
0x4000000000811f2f reload(rtx_def*, int)
        ../../gcc/reload1.c:1051
0x4000000000604caf do_reload
        ../../gcc/ira.c:4635
0x4000000000604caf rest_of_handle_reload
        ../../gcc/ira.c:4736

Note that this is the original version of pr55921.c with the matching
constraints.

[Bug middle-end/55943] [4.8 Regression] ICE in gen_reg_rtx

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.8.0
            Summary|ICE in gen_reg_rtx          |[4.8 Regression] ICE in
                   |                            |gen_reg_rtx
      Known to fail|                            |4.8.0

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2013-01-14 13:23:53 UTC ---
At least a regression in 4.8 then.

[Bug middle-end/55943] [4.6/4.7/4.8 Regression] ICE in gen_reg_rtx

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org
            Summary|[4.8 Regression] ICE in     |[4.6/4.7/4.8 Regression]
                   |gen_reg_rtx                 |ICE in gen_reg_rtx
      Known to fail|                            |4.4.1

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-01-14 15:44:50 UTC ---
I don't have 4.3 around, but 4.4.1 certainly ICEs on this, both with -O0 and
with optimizations.
The ICE is during reload, similarly to the trunk ICE.
I guess the testcase in the testsuite should be just limited to x86_64/i686 and
perhaps few others where the "r" resp. "=r" constraint can be handled.

[Bug middle-end/55943] [4.6/4.7/4.8 Regression] ICE in gen_reg_rtx

[aldyh at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

Aldy Hernandez <aldyh at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-02-07
                 CC|                            |aldyh at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #3 from Aldy Hernandez <aldyh at gcc dot gnu.org> 2013-02-07 21:13:06 UTC ---
Confirmed with a cross to --target=ia64-linux-gnu.

[Bug middle-end/55943] [4.6/4.7/4.8 Regression] ICE in gen_reg_rtx

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4

[Bug middle-end/55943] [4.6/4.7/4.8/4.9 Regression] ICE in gen_reg_rtx

[danglin at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

John David Anglin <danglin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|ia64-*-*                    |ia64-*-*,hppa*64*-*-*
                 CC|                            |danglin at gcc dot gnu.org

--- Comment #4 from John David Anglin <danglin at gcc dot gnu.org> 2013-03-16 13:17:17 UTC ---
I believe the problem is in this hunk of code:

  /* See if we can coerce the target into moving both values at once.  */

  /* Move floating point as parts.  */
  if (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT
      && can_create_pseudo_p ()
      && optab_handler (mov_optab, GET_MODE_INNER (mode)) != CODE_FOR_nothing)
    try_int = false;
  /* Not possible if the values are inherently not adjacent.  */
  else if (GET_CODE (x) == CONCAT || GET_CODE (y) == CONCAT)
    try_int = false;
  /* Is possible if both are registers (or subregs of registers).  */
  else if (register_operand (x, mode) && register_operand (y, mode))
    try_int = true;
  /* If one of the operands is a memory, and alignment constraints
     are friendly enough, we may be able to do combined memory operations.
     We do not attempt this if Y is a constant because that combination is
     usually better with the by-parts thing below.  */
  else if ((MEM_P (x) ? !CONSTANT_P (y) : MEM_P (y))
           && (!STRICT_ALIGNMENT
               || get_mode_alignment (mode) == BIGGEST_ALIGNMENT))
    try_int = true;
  else
    try_int = false;

When the inner mode is smaller than a word, a pseudo is needed to extract
the value.  The asm causes this to occur after reload starts, causing the
ICE.

[Bug middle-end/55943] [4.6/4.7/4.8/4.9 Regression] ICE in gen_reg_rtx

[danglin at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

--- Comment #5 from John David Anglin <danglin at gcc dot gnu.org> 2013-03-16 13:19:46 UTC ---
Created attachment 29680
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29680
Patch

Oops, previous comment comment contained patch that I'm testing.

[Bug middle-end/55943] [4.6/4.7/4.8/4.9 Regression] ICE in gen_reg_rtx

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.8.0                       |4.8.1

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-03-22 14:42:39 UTC ---
GCC 4.8.0 is being released, adjusting target milestone.

[Bug middle-end/55943] [4.7/4.8/4.9 Regression] ICE in gen_reg_rtx

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.8.1                       |4.8.2

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.8.1 has been released.

[Bug middle-end/55943] [4.7/4.8/4.9 Regression] ICE in gen_reg_rtx

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.8.2                       |4.8.3

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.8.2 has been released.

[Bug middle-end/55943] [4.7/4.8/4.9 Regression] ICE in gen_reg_rtx

[danglin at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

--- Comment #9 from John David Anglin <danglin at gcc dot gnu.org> ---
*** Bug 56382 has been marked as a duplicate of this bug. ***

[Bug middle-end/55943] [4.7/4.8/4.9/4.10 Regression] ICE in gen_reg_rtx

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.8.3                       |4.8.4

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 4.8.3 is being released, adjusting target milestone.

[Bug rtl-optimization/55943] [4.8/4.9/5 Regression] ICE in gen_reg_rtx

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.8.4                       |4.8.5

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.8.4 has been released.

[Bug rtl-optimization/55943] [4.8/4.9/5/6 Regression] ICE in gen_reg_rtx

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.8.5                       |4.9.3

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
The gcc-4_8-branch is being closed, re-targeting regressions to 4.9.3.

[Bug rtl-optimization/55943] [4.9/5/6 Regression] ICE in gen_reg_rtx

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.9.3 has been released.

[Bug rtl-optimization/55943] [4.9/5/6 Regression] ICE in gen_reg_rtx

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.9.3                       |4.9.4