[Bug c++/37922] code generation error

[rwgk at yahoo dot com]

------- Comment #5 from rwgk at yahoo dot com  2008-12-13 22:09 -------
The bug is still present in svn revsion 140355 from last night.

I ran an automatic search through the svn history. The result is that
revision 129269 (svn log below) introduced the bug.

Could someone please confirm the bug with the reproducer I posted
last weekend? It should only take a second.


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r129269 | rsandifo | 2007-10-12 09:54:38 -0700 (Fri, 12 Oct 2007) | 14 lines

gcc/
        * dse.c (find_shift_sequence): Reinstate "<= UNITS_PER_WORD" condition.
        * var-tracking.c (micro_operation_def): Update comment on u.loc.
        (mode_for_reg_attrs, var_lowpart): New functions.
        (add_uses): Consider recording a lowpart of LOC for MO_USE.
        (add_stores): Likewise MO_SET and MO_COPY.  If the source of a set
        or copy is known, set LOC to the SET that performs the set, instead
        of the destination.
        (find_src_status, find_src_set_src): Remove LOC parameter.
        Replace INSN with the source value.
        (compute_bb_dataflow, emit_notes_in_bb): Check for a SET u.loc when
        handling MO_SET and MO_COPY.  Update the calls to find_src_status
        and find_src_set_src.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37922