[Bug tree-optimization/26626] [4.2 Regression] ICE in in add_virtual_operand

["mueller at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #10 from mueller at gcc dot gnu dot org  2006-03-13 16:17 -------
it looks to me that this commit exposed/introduced the ICE: 

r111300 | dberlin | 2006-02-20 14:38:01 +0100 (Mon, 20 Feb 2006) | 22 lines
Changed paths:
   M /trunk/gcc/ChangeLog
   M /trunk/gcc/passes.c
   M /trunk/gcc/tree-flow.h
   M /trunk/gcc/tree-pass.h
   M /trunk/gcc/tree-sra.c
   M /trunk/gcc/tree-ssa-alias.c
   M /trunk/gcc/tree-ssa-forwprop.c
   M /trunk/gcc/tree-ssa-operands.c
   M /trunk/gcc/tree.h

2006-02-20  Daniel Berlin  <dberlin@dberlin.org>

        * tree.h (struct tree_memory_tag): Add is_used_alone member.
        (TMT_USED_ALONE): New macro.
        * tree-pass.h (PROP_tmt_usage): New property.
        (TODO_update_tmt_usage): New todo.
        * tree-ssa-alias.c (updating_used_alone): New variable.
        (recalculate_used_alone): New function.   
        (compute_may_aliases): Set updating_used_alone, call
        recalculate_used_alone. 
        * tree-sra.c (pass_sra): Note that this pass destroys
        PROP_tmt_usage, and add TODO_update_tmt_usage.
        * tree-ssa-forwprop.c (pass_forwprop): Ditto.
        * tree-flow.h (updating_used_alone): Prototype.
        (recalculate_used_alone): Ditto.
        * passes.c (execute_todo): Add code to set updating_used_alone,
        and call recalculate.
        * tree-ssa-operands.c (add_virtual_operand): Only append bare def
        for clobber if used alone, and add assert to verify used_alone
        status.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26626