[Bug c/21107] New: internal compiler error: in expand_one_stack_var_at, at cfgexpand.c:476

[Bug c/21107] New: internal compiler error: in expand_one_stack_var_at, at cfgexpand.c:476

[e9925248 at stud4 dot tuwien dot ac dot at]

If Pmode is smaller than the HOST_BITS_PER_WIDE_INT (ie for i686 as host all
targets, which use HImode or QImode as Pmode), a stack overflow produce the
following internal compiler error:

$./cc1 t4.c
 check1972

/homes/mkoegler/m68hc05/src/host-i686-pc-linux-gnu/gcc/test/t4.c: In function
'check1972':
/homes/mkoegler/m68hc05/src/host-i686-pc-linux-gnu/gcc/test/t4.c:7: internal
compiler error: in expand_one_stack_var_at, at cfgexpand.c:476
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
$cat t4.c
union S1972
{
  char b[24000];
};
void
check1972 ()
{
  union S1972 ret;
  union S1972 b1;
  union S1972 b2;
}

$./cc1 --version
GNU C version 4.1.0 20050416 (experimental) (avr)
        compiled by GNU C version 4.1.0 20050302 (experimental).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096

-- 
           Summary: internal compiler error: in expand_one_stack_var_at, at
                    cfgexpand.c:476
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: e9925248 at stud4 dot tuwien dot ac dot at
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: avr-unknown-none


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21107

[Bug middle-end/21107] internal compiler error: in expand_one_stack_var_at, at cfgexpand.c:476

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-04-19 14:47 -------
  /* If this fails, we've overflowed the stack frame.  Error nicely?  */
  gcc_assert (offset == trunc_int_for_mode (offset, Pmode));

Hmm, I wonder if this is a regression or not.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c                           |middle-end
           Keywords|                            |ice-on-invalid-code


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21107

[Bug middle-end/21107] internal compiler error: in expand_one_stack_var_at, at cfgexpand.c:476

[ericw at evcohs dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ericw at evcohs dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21107

[Bug middle-end/21107] internal compiler error: in expand_one_stack_var_at, at cfgexpand.c:476

[e9925248 at stud4 dot tuwien dot ac dot at]

------- Additional Comments From e9925248 at stud4 dot tuwien dot ac dot at  2005-04-20 08:08 -------
It compiles on a older version (3.3.2):
$avr-gcc -S t.c
$cat t.s
        .file   "t.c"
        .arch avr2
__SREG__ = 0x3f
__SP_H__ = 0x3e
__SP_L__ = 0x3d
__tmp_reg__ = 0
__zero_reg__ = 1
        .global __do_copy_data
        .global __do_clear_bss
        .text
.global check1972
        .type   check1972, @function
check1972:
/* prologue: frame size=72000 */
        push r28
        push r29
        in r28,__SP_L__
        in r29,__SP_H__
        subi r28,lo8(72000)
        sbci r29,hi8(72000)
        in __tmp_reg__,__SREG__
        cli
        out __SP_H__,r29
        out __SREG__,__tmp_reg__
        out __SP_L__,r28
/* prologue end (size=11) */
/* epilogue: frame size=72000 */
        subi r28,lo8(-72000)
        sbci r29,hi8(-72000)
        in __tmp_reg__,__SREG__
        cli
        out __SP_H__,r29
        out __SREG__,__tmp_reg__
        out __SP_L__,r28
        pop r29
        pop r28
        ret
/* epilogue end (size=10) */
/* function check1972 size 21 (0) */
        .size   check1972, .-check1972
/* File "t.c": code   21 = 0x0015 (   0), prologues  11, epilogues  10 */
$avr-gcc -v
Reading specs from /usr/lib/gcc-lib/avr/3.3.2/specs
Configured with: ./configure --prefix=/usr --mandir=/usr/share/man --target=avr
--enable-languages=c
Thread model: single
gcc version 3.3.2

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21107

[Bug middle-end/21107] [4.0/4.1 regression] internal compiler error: in expand_one_stack_var_at, at cfgexpand.c:476

[belyshev at depni dot sinp dot msu dot ru]

------- Additional Comments From belyshev at depni dot sinp dot msu dot ru  2005-04-29 12:38 -------
Confirmed, note: the code is valid C.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
  GCC build triplet|i686-pc-linux-gnu           |
   GCC host triplet|i686-pc-linux-gnu           |
           Keywords|ice-on-invalid-code         |ice-on-valid-code
      Known to fail|                            |4.0.0 4.0.1 4.1.0
      Known to work|                            |3.4.4 3.3.2
   Last reconfirmed|0000-00-00 00:00:00         |2005-04-29 12:38:31
               date|                            |
            Summary|internal compiler error: in |[4.0/4.1 regression]
                   |expand_one_stack_var_at, at |internal compiler error: in
                   |cfgexpand.c:476             |expand_one_stack_var_at, at
                   |                            |cfgexpand.c:476


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21107

[Bug middle-end/21107] [4.0/4.1 regression] internal compiler error: in expand_one_stack_var_at, at cfgexpand.c:476

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-04-29 12:58 -------
(In reply to comment #3)
> Confirmed, note: the code is valid C.

But we should be erroring out as the stack size is just too big for this target.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21107