tree-ssa-alias.c (struct used_part): Add write_only field.

[gcc.git] / gcc / ChangeLog

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+2006-01-16  Richard Guenther  <rguenther@suse.de>
+
+       * tree-ssa-alias.c (struct used_part): Add write_only field.
+       (get_or_create_used_part_for): Initialize it to true.
+       (create_overlap_variables_for): Don't create structure variables
+       for structures that only are written to.
+       (find_used_portions): Handle MODIFY_EXPR to track whether a
+       structure is only written to.
+
 2006-01-16  Kazu Hirata  <kazu@codesourcery.com>
 
        * bb-reorder.c (partition_hot_cold_basic_blocks): Make it