[Bug c/21921] New: internal compiler error: in tsi_link_before, at tree-iterator.c:113

[Bug c/21921] New: internal compiler error: in tsi_link_before, at tree-iterator.c:113

[p dot van-hoof at qub dot ac dot uk]

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When the attached code is compiled as follows, an ICE will result:

dogbert> gcc -O1 -funsafe-math-optimizations -c h.c
h.c: In function ‘Q’:
h.c:10: internal compiler error: in tsi_link_before, at tree-iterator.c:113
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
dogbert> gcc -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/usr/local/gcc410
--enable-languages=c,c++,f95
Thread model: posix
gcc version 4.1.0 20050605 (experimental)

This bug only appears on the mainline, but not in any of the release branches.

-- 
           Summary: internal compiler error: in tsi_link_before, at tree-
                    iterator.c:113
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: p dot van-hoof at qub dot ac dot uk
                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: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21921

[Bug c/21921] internal compiler error: in tsi_link_before, at tree-iterator.c:113

[p dot van-hoof at qub dot ac dot uk]

------- Additional Comments From p dot van-hoof at qub dot ac dot uk  2005-06-05 14:22 -------
Created an attachment (id=9032)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9032&action=view)
code that triggers the ICE


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21921

[Bug middle-end/21921] internal compiler error: in tsi_link_before, at tree-iterator.c:113

[pinskia at gcc dot gnu dot org]

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21921

[Bug middle-end/21921] [4.1 Regression] internal compiler error: in tsi_link_before, at tree-iterator.c:113

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-06-05 15:39 -------
Confirmed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bonzini at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
  GCC build triplet|i686-pc-linux-gnu           |
   GCC host triplet|i686-pc-linux-gnu           |
   Last reconfirmed|0000-00-00 00:00:00         |2005-06-05 15:39:26
               date|                            |
            Summary|internal compiler error: in |[4.1 Regression] internal
                   |tsi_link_before, at tree-   |compiler error: in
                   |iterator.c:113              |tsi_link_before, at tree-
                   |                            |iterator.c:113
   Target Milestone|---                         |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21921

[Bug tree-optimization/21921] [4.1 Regression] internal compiler error: in tsi_link_before, at tree-iterator.c:113

[bonzini at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |bonzini at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2005-06-05 15:39:26         |2005-06-06 07:03:52
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21921

[Bug tree-optimization/21921] [4.1 Regression] internal compiler error: in tsi_link_before, at tree-iterator.c:113

[bonzini at gcc dot gnu dot org]

------- Additional Comments From bonzini at gcc dot gnu dot org  2005-06-06 09:10 -------
http://gcc.gnu.org/ml/gcc-patches/2005-06/msg00446.html

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21921

[Bug tree-optimization/21921] [4.1 Regression] internal compiler error: in tsi_link_before, at tree-iterator.c:113

[bonzini at gcc dot gnu dot org]

------- Additional Comments From bonzini at gcc dot gnu dot org  2005-06-06 15:08 -------
The patch fixes the bug because in the poster's test case we have to insert a
reciprocal computation in an empty basic block.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21921

[Bug tree-optimization/21921] [4.1 Regression] internal compiler error: in tsi_link_before, at tree-iterator.c:113

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-07-13 14:42 -------
Subject: Bug 21921

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	bonzini@gcc.gnu.org	2005-07-13 14:42:26

Modified files:
	gcc            : ChangeLog tree-iterator.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/gcc.dg: pr21921.c 

Log message:
	ChangeLog:
	2005-07-13  Paolo Bonzini  <bonzini@gnu.org>
	
	PR tree-optimization/21921
	* tree-iterator.c (tsi_link_before): Support the case when
	tsi_end_p (tsi) == true.
	
	testsuite/ChangeLog:
	2005-07-13  Paolo Bonzini  <bonzini@gnu.org>
	
	PR tree-optimization/21921
	* gcc.dg/tree-ssa/pr21921.c: New.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.dg/pr21921.c.diff?cvsroot=gcc&r1=NONE&r2=1.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.9428&r2=2.9429
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-iterator.c.diff?cvsroot=gcc&r1=2.5&r2=2.6
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.5760&r2=1.5761



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21921

[Bug tree-optimization/21921] [4.1 Regression] internal compiler error: in tsi_link_before, at tree-iterator.c:113

[bonzini at gcc dot gnu dot org]

------- Additional Comments From bonzini at gcc dot gnu dot org  2005-07-13 14:45 -------
Fixed by the patch above.


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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21921