2004-10-18  Revital Eres  <eres@il.ibm.com>

        * Makefile.in (loop-unroll.o): Add VARRAY_H dependency.
        * loop-unroll.c: Include varray.h.
        (struct var_to_expand, struct opt_info): Rename split_ivs_info to
        opt_info and expand it to support variable expansion.
        (analyze_insns_in_loop): Rename analyze_ivs_to_split and
        expand it to support variable expansion.
        (pt_info_start_duplication): Rename si_info_start_duplication.
        (apply_opt_in_copies): Rename split_ivs_in_copies and add support
        to the variable expansion optimization.
        (free_opt_info): Rename free_si_info.
        (analyze_insn_to_expand_var, referenced_in_one_insn_in_loop_p,
        expand_var_during_unrolling, insert_var_expansion_initialization,
        combine_var_copies_in_loop_exit, release_var_copies,
        get_expansion): New functions.
        (peel_loop_completely, unroll_loop_constant_iterations,
        unroll_loop_runtime_iterations, peel_loop_simple,
        unroll_loop_stupid): Change uses of struct si_info
        to struct opt_info
        and add uses of fvariable-expansion-in-unroller flag.
        * params.def: Add parameter to restrict the number of expansions.
        * params.h: (MAX_VARIABLE_EXPANSIONS): New define to restrict
        the number of expansions.
        * common.opt: (fvariable-expansion-in-unroller): New flag.
        * doc/invoke.texi: (fvariable-expansion-in-unroller): Document.

From-SVN: r89197