[Bug optimization/13347] New: Incorrect code generated for reinterpret_cast<> of pointer-to-member

[Bug optimization/13347] New: Incorrect code generated for reinterpret_cast<> of pointer-to-member

[bryner at brianryner dot com]

If a pointer to member function is passed through reinterpret_cast<>, then
applying it to an object results in a crash.  This happens at any optimization
level above -O0, but goes away with -fdisable-tree-ssa.

Testcase coming up.

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           Summary: Incorrect code generated for reinterpret_cast<> of
                    pointer-to-member
           Product: gcc
           Version: tree-ssa
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bryner at brianryner dot com
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13347

[Bug optimization/13347] Incorrect code generated for reinterpret_cast<> of pointer-to-member

[bryner at brianryner dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13347

[Bug optimization/13347] Incorrect code generated for reinterpret_cast<> of pointer-to-member

[bryner at brianryner dot com]

------- Additional Comments From bryner at brianryner dot com  2003-12-07 22:21 -------
Created an attachment (id=5296)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=5296&action=view)
reduced testcase


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13347

[Bug optimization/13347] [tree-ssa] Incorrect code generated for reinterpret_cast<> of pointer-to-member

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Incorrect code generated for|[tree-ssa] Incorrect code
                   |reinterpret_cast<> of       |generated for
                   |pointer-to-member           |reinterpret_cast<> of
                   |                            |pointer-to-member
   Target Milestone|---                         |tree-ssa


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13347

[Bug optimization/13347] [tree-ssa] Incorrect code generated for reinterpret_cast<> of pointer-to-member

[bryner at brianryner dot com]

------- Additional Comments From bryner at brianryner dot com  2003-12-07 22:28 -------
Should have mentioned - this is with a tree-ssa-branch build pulled last night.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13347

[Bug optimization/13347] [tree-ssa] Incorrect code generated for reinterpret_cast<> of pointer-to-member

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2003-12-08 18:56 -------
Confirmed, this is caused somehow by sra.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |dnovillo at redhat dot com
                   |dot org                     |
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2003-12-08 18:56:20
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13347

[Bug optimization/13347] [tree-ssa] Incorrect code generated for reinterpret_cast<> of pointer-to-member

[bryner at brianryner dot com]

------- Additional Comments From bryner at brianryner dot com  2004-01-26 00:27 -------
Why was this marked known-to-work=tree-ssa? It's known to _fail_ on the tree-ssa
branch.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13347

[Bug optimization/13347] [tree-ssa] Incorrect code generated for reinterpret_cast<> of pointer-to-member

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-01-26 00:29 -------
I made a mistake, it was an accident.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |tree-ssa
      Known to work|tree-ssa                    |3.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13347

[Bug optimization/13347] [tree-ssa] Incorrect code generated for reinterpret_cast<> of pointer-to-member

[giovannibajo at libero dot it]

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------- Additional Comments From giovannibajo at libero dot it  2004-01-26 02:11 -------
By the way, since I was wondering, this is allowed by [expr.reinterpret.cast]/9 
bullet 1: "converting an rvalue of type “pointer to member function” to a 
different pointer to member function type and back to its original type yields 
the original pointer to member value.". 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13347

[Bug optimization/13347] [tree-ssa] Incorrect code generated for reinterpret_cast<> of pointer-to-member

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2004-02-27 12:41 -------
Subject: Bug 13347

CVSROOT:	/cvs/gcc
Module name:	gcc
Branch: 	tree-ssa-20020619-branch
Changes by:	dnovillo@gcc.gnu.org	2004-02-27 12:41:37

Modified files:
	gcc            : ChangeLog.tree-ssa tree-sra.c tree-ssa.c tree.h 

Log message:
	PR optimization/13347
	* tree-sra.c (scalarize_structure_assignment): Use STRIP_NOPS
	instead of STRIP_USELESS_TYPE_CONVERSION to remove type casts
	from RHS of the assignment.
	
	* tree-ssa.c (tree_ssa_useless_type_conversion_1): Reformat
	and rephrase comments.
	* tree.h (STRIP_USELESS_TYPE_CONVERSION): Reformat comment.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.tree-ssa.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.1.2.1230&r2=1.1.2.1231
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-sra.c.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.1.2.23&r2=1.1.2.24
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-ssa.c.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.1.4.206&r2=1.1.4.207
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree.h.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.342.2.173&r2=1.342.2.174



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13347

[Bug optimization/13347] [tree-ssa] Incorrect code generated for reinterpret_cast<> of pointer-to-member

[dnovillo at gcc dot gnu dot org]

------- Additional Comments From dnovillo at gcc dot gnu dot org  2004-02-27 12:42 -------

Fixed.

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13347

[Bug optimization/13347] [tree-ssa] Incorrect code generated for reinterpret_cast<> of pointer-to-member

[dnovillo at gcc dot gnu dot org]

------- Additional Comments From dnovillo at gcc dot gnu dot org  2004-02-27 12:43 -------

Explanation of fix:

http://gcc.gnu.org/ml/gcc-patches/2004-02/msg02600.html

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13347