[Bug tree-optimization/39713] New: [4.4/4.5 Regression] ICE in get_expr_value_id

[Bug tree-optimization/39713] New: [4.4/4.5 Regression] ICE in get_expr_value_id

[jakub at gcc dot gnu dot org]

Since r141534 (PR37542), the following testcase segfaults during fre at -O1 and
higher:

template <typename To, typename From>
static inline To
bitwise_cast (From from)
{
  union
  {
    From f;
    To t;
  } u;
  u.f = from;
  return u.t;
}

extern void foo (unsigned char *);

double
bar ()
{
  unsigned char b[sizeof (unsigned long long)];
  foo (b);
  return bitwise_cast<double> (*(unsigned long long *) b);
}


-- 
           Summary: [4.4/4.5 Regression] ICE in get_expr_value_id
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jakub at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39713

[Bug tree-optimization/39713] [4.4/4.5 Regression] ICE in get_expr_value_id

[jakub at gcc dot gnu dot org]

-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39713

[Bug tree-optimization/39713] [4.4/4.5 Regression] ICE in get_expr_value_id

[rguenth at gcc dot gnu dot org]

------- Comment #1 from rguenth at gcc dot gnu dot org  2009-04-10 18:31 -------
I will have a looksee.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |rguenth at gcc dot gnu dot
                   |dot org                     |org
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2009-04-10 18:31:30
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39713

[Bug tree-optimization/39713] [4.4/4.5 Regression] ICE in get_expr_value_id

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2009-04-10 18:43 -------
I am testing the following

Index: tree-ssa-sccvn.c
===================================================================
--- tree-ssa-sccvn.c    (revision 145876)
+++ tree-ssa-sccvn.c    (working copy)
@@ -257,9 +257,10 @@ vn_get_expr_for (tree name)
   switch (TREE_CODE_CLASS (gimple_assign_rhs_code (def_stmt)))
     {
     case tcc_reference:
-      if (gimple_assign_rhs_code (def_stmt) == VIEW_CONVERT_EXPR
-         || gimple_assign_rhs_code (def_stmt) == REALPART_EXPR
-         || gimple_assign_rhs_code (def_stmt) == IMAGPART_EXPR)
+      if ((gimple_assign_rhs_code (def_stmt) == VIEW_CONVERT_EXPR
+          || gimple_assign_rhs_code (def_stmt) == REALPART_EXPR
+          || gimple_assign_rhs_code (def_stmt) == IMAGPART_EXPR)
+         && TREE_CODE (gimple_assign_rhs1 (def_stmt)) == SSA_NAME)
        expr = fold_build1 (gimple_assign_rhs_code (def_stmt),
                            gimple_expr_type (def_stmt),
                            TREE_OPERAND (gimple_assign_rhs1 (def_stmt), 0));


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39713

[Bug tree-optimization/39713] [4.4/4.5 Regression] ICE in get_expr_value_id

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2009-04-11 07:34 -------
Subject: Bug 39713

Author: rguenth
Date: Sat Apr 11 07:34:09 2009
New Revision: 145951

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=145951
Log:
2009-04-11  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/39713
        * tree-ssa-sccvn.c (vn_get_expr_for): Make sure built
        reference trees have SSA_NAME operands.

        * g++.dg/torture/pr39713.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/torture/pr39713.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39713

[Bug tree-optimization/39713] [4.4/4.5 Regression] ICE in get_expr_value_id

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2009-04-11 07:43 -------
Subject: Bug 39713

Author: rguenth
Date: Sat Apr 11 07:42:52 2009
New Revision: 145952

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=145952
Log:
2009-04-11  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/39713
        * tree-ssa-sccvn.c (vn_get_expr_for): Make sure built
        reference trees have SSA_NAME operands.

        * g++.dg/torture/pr39713.C: New testcase.

Added:
    branches/gcc-4_4-branch/gcc/testsuite/g++.dg/torture/pr39713.C
Modified:
    branches/gcc-4_4-branch/gcc/ChangeLog
    branches/gcc-4_4-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_4-branch/gcc/tree-ssa-sccvn.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39713

[Bug tree-optimization/39713] [4.4/4.5 Regression] ICE in get_expr_value_id

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2009-04-11 07:44 -------
Fixe.d


-- 

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=39713