[Bug tree-optimization/38153] ICE in testcase when compiled with -ftree-parallelize-loops

[Bug tree-optimization/38153] ICE in testcase when compiled with -ftree-parallelize-loops

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38153

Zdenek Sojka <zsojka at seznam dot cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |zsojka at seznam dot cz

--- Comment #4 from Zdenek Sojka <zsojka at seznam dot cz> 2010-10-20 14:52:32 UTC ---
A bit different testcase, crashes on x86_64-pc-linux-gnu, r165719

----- testcase.c -----
void
foo (void **a, int i)
{
  while (i--)
    a[i] = &&label;
label:;
}
----------------------

$ gcc -O -ftree-parallelize-loops=2 testcase.c
testcase.c: In function 'foo':
testcase.c:2:1: error: label 
label has incorrect context in bb 6testcase.c:2:1: internal compiler error:
verify_flow_info failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

-ftree-parallelize-loops=N, crashes for N>=2

[Bug tree-optimization/38153] ICE in testcase when compiled with -ftree-parallelize-loops

[reichelt at gcc dot gnu dot org]

------- Comment #3 from reichelt at gcc dot gnu dot org  2008-12-29 03:34 -------
*** Bug 38154 has been marked as a duplicate of this bug. ***


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38153

[Bug tree-optimization/38153] ICE in testcase when compiled with -ftree-parallelize-loops

[reichelt at gcc dot gnu dot org]

------- Comment #2 from reichelt at gcc dot gnu dot org  2008-12-28 18:40 -------
Btw, the error message is a little hosed:

bug.c: In function 'foo':
bug.c:2: error: label 
L has incorrect context in bb 8bug.c:7: internal compiler error:
verify_flow_info failed
Please submit a full bug report, [etc.]

It looks like most of the fprintf statements in gimple_verify_flow_info
lack a trailing "\n".


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38153

[Bug tree-optimization/38153] ICE in testcase when compiled with -ftree-parallelize-loops

[reichelt at gcc dot gnu dot org]

------- Comment #1 from reichelt at gcc dot gnu dot org  2008-12-28 18:24 -------
Confirmed. Shorter testcase that crashes with "-O -ftree-parallelize-loops=2"
(on i686-pc-linux-gnu):

=============================
void foo(int n, void** p)
{
  int i;
  for (i = 0; i < n; ++i)
    p[i] = &&L;

  L: goto **p;
}
=============================

The crash happens since GCC 4.3.0 where -ftree-parallelize-loops was
introduced.


-- 

reichelt at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |reichelt at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |monitored
   Last reconfirmed|0000-00-00 00:00:00         |2008-12-28 18:24:48
               date|                            |
            Summary|failure in testcase when    |ICE in testcase when
                   |compiled with -ftree-       |compiled with -ftree-
                   |paralleilze-loops           |parallelize-loops


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38153