[Bug tree-optimization/32366] New: [4.3 Regression] Segfault in significand_size with -ftree-optimize

[Bug tree-optimization/32366] New: [4.3 Regression] Segfault in significand_size with -ftree-optimize

[tbm at cyrius dot com]

I'm getting the following segfault with current trunk.  This compiled
fine with trunk from 20070515 but produces the segfault with 20070604.

(sid)26454:tbm@em64t: ~] /usr/lib/gcc-snapshot/bin/gcc -O -ftree-vectorize -c
libsamplerate-termination_test.c
libsamplerate-termination_test.c: In function 'stream_test':
libsamplerate-termination_test.c:7: internal compiler error: Segmentation fault
Please submit a full bug report,

Testcase:


stream_test (void)
{
  static float input[20];
  int k;
  for (k = 0; k < 20; k++)
    input[k] = k * 1.0;
}


-- 
           Summary: [4.3 Regression] Segfault in significand_size with -
                    ftree-optimize
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tbm at cyrius dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32366

[Bug tree-optimization/32366] [4.3 Regression] Segfault in significand_size with -ftree-optimize

[tbm at cyrius dot com]

------- Comment #1 from tbm at cyrius dot com  2007-06-16 12:59 -------
Program received signal SIGSEGV, Segmentation fault.
significand_size (mode=<value optimized out>) at gcc/real.c:2572
2572      if (fmt->b == 10)
(gdb) where
#0  significand_size (mode=<value optimized out>) at gcc/real.c:2572
#1  0x0000000000679e3f in simplify_unary_operation (code=FLOAT_TRUNCATE,
mode=V2SFmode, op=0x2af5ac927460, op_mode=<value optimized out>) at
gcc/simplify-rtx.c:701
#2  0x00000000009b2f13 in combine_simplify_rtx (x=0x2af5ac9274a0,
op0_mode=V2DFmode, in_dest=0) at gcc/combine.c:4603
#3  0x00000000009b5148 in subst (x=0x2af5ac9274a0, from=0x2af5ac92e320,
to=0x2af5ac927460, in_dest=0, unique_copy=0) at gcc/combine.c:4456
#4  0x00000000009b4e15 in subst (x=0x2af5ac92e4e0, from=0x2af5ac92e320,
to=0x2af5ac927460,
    in_dest=0, unique_copy=0) at gcc/combine.c:4406
#5  0x00000000009b4e15 in subst (x=0x2af5ac92e500, from=0x2af5ac92e320,
to=0x2af5ac927460, in_dest=0, unique_copy=0) at gcc/combine.c:4406
#6  0x00000000009b7252 in try_combine (i3=0x2af5ac8d8500, i2=<value optimized
out>, i1=0x0, new_direct_jump_p=0x7ffffedab564) at gcc/combine.c:2676
#7  0x00000000009ba9ee in rest_of_handle_combine () at gcc/combine.c:1116
#8  0x000000000061bce7 in execute_one_pass (pass=0xe50bc0) at gcc/passes.c:1125
#9  0x000000000061beac in execute_pass_list (pass=0xe50bc0)
    at gcc/passes.c:1178
#10 0x000000000061bebe in execute_pass_list (pass=0xe4c9a0)
    at gcc/passes.c:1179
#11 0x00000000006ea49f in tree_rest_of_compilation (fndecl=0x2af5ac869a00)
    at gcc/tree-optimize.c:406
#12 0x0000000000843280 in cgraph_expand_function (node=0x2af5ac884200)
    at gcc/cgraphunit.c:1073
#13 0x0000000000844df5 in cgraph_optimize () at gcc/cgraphunit.c:1142
#14 0x0000000000413cfe in c_write_global_declarations () at gcc/c-decl.c:7911
#15 0x0000000000694b78 in toplev_main (argc=<value optimized out>, argv=<value
optimized out>) at gcc/toplev.c:1064
#16 0x00002af5ac0748e4 in __libc_start_main () from /lib/libc.so.6
#17 0x0000000000403fd9 in _start ()
(gdb)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32366

[Bug tree-optimization/32366] [4.3 Regression] Segfault in significand_size with -ftree-optimize

[tbm at cyrius dot com]

------- Comment #2 from tbm at cyrius dot com  2007-06-16 13:00 -------
This segfault shows up on x86_64-linux-gnu, but not on ia64-linux-gnu


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32366

[Bug rtl-optimization/32366] [4.3 Regression] Segfault in significand_size with -ftree-vectorize

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2007-06-16 17:21 -------
combine.c is RTL :).


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org
          Component|tree-optimization           |rtl-optimization
 GCC target triplet|                            |x86_64-linux-gnu
            Summary|[4.3 Regression] Segfault in|[4.3 Regression] Segfault in
                   |significand_size with -     |significand_size with -
                   |ftree-optimize              |ftree-vectorize
   Target Milestone|---                         |4.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32366

[Bug rtl-optimization/32366] [4.3 Regression] Segfault in significand_size with -ftree-vectorize

[ubizjak at gmail dot com]

------- Comment #4 from ubizjak at gmail dot com  2007-06-17 11:34 -------
Patch at http://gcc.gnu.org/ml/gcc-patches/2007-06/msg01171.html


-- 

ubizjak at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |ubizjak at gmail dot com
                   |dot org                     |
                URL|                            |http://gcc.gnu.org/ml/gcc-
                   |                            |patches/2007-
                   |                            |06/msg01171.html
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|0                           |1
           Keywords|                            |patch
   Last reconfirmed|0000-00-00 00:00:00         |2007-06-17 11:34:14
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32366

[Bug rtl-optimization/32366] [4.3 Regression] Segfault in significand_size with -ftree-vectorize

[uros at gcc dot gnu dot org]

------- Comment #5 from uros at gcc dot gnu dot org  2007-06-17 19:23 -------
Subject: Bug 32366

Author: uros
Date: Sun Jun 17 19:23:30 2007
New Revision: 125777

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=125777
Log:
        PR rtl-optimization/32366
        * simplify-rtx.c (simplify_unary_operation_1) [FLOAT_TRUNCATE,
        FLOAT_EXTEND]: Prevent non-scalar modes from entering
        significand_size.

testsuite/ChangeLog:

        PR rtl-optimization/32366
        * testsuite/gcc.dg/vect/pr32366.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/vect/pr32366.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/simplify-rtx.c
    trunk/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32366

[Bug rtl-optimization/32366] [4.3 Regression] Segfault in significand_size with -ftree-vectorize

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2007-06-18 11:28 -------
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=32366