[Bug tree-optimization/42585] [4.5 Regression] SRA is not good for structure copies with one replacement any more

["jamborm at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #3 from jamborm at gcc dot gnu dot org  2010-01-21 16:18 -------
Subject: Bug 42585

Author: jamborm
Date: Thu Jan 21 16:18:06 2010
New Revision: 156156

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=156156
Log:
2010-01-21  Martin Jambor  <mjambor@suse.cz>

        PR tree-optimization/42585
        * tree-sra.c (struct access): New field grp_total_scalarization.
        (dump_access): Dump the new field.
        (should_scalarize_away_bitmap): New variable.
        (cannot_scalarize_away_bitmap): Likewise.
        (sra_initialize): Allocate new bitmaps.
        (sra_deinitialize): Free new bitmaps.
        (create_access_1): New function.
        (create_access): Parts moved to create_access_1.
        (type_consists_of_records_p): New function.
        (completely_scalarize_record): Likewise.
        (build_access_from_expr): Set bit in cannot_scalarize_away_bitmap.
        (build_accesses_from_assign): Set bits in should_scalarize_away_bitmap.
        (sort_and_splice_var_accesses): Hint groups with a total_scalarization
        access.
        (analyze_all_variable_accesses): Completely scalarize small eligible
        records.

        * testsuite/gcc.dg/tree-ssa/pr42585.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr42585.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-sra.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42585