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* tree-ssa-loop-ivopts.c (strip_offset_1) <MULT_EXPR>: New case. (force_expr_to_var_cost) <NEGATE_EXPR>: Likewise. (ptr_difference_cost): Use affine combinations to compute it. (difference_cost): Likewise. (get_computation_cost_at): Compute more accurate cost for addresses if the ratio is a multiplier allowed in addresses. For non-addresses, consider that an additional offset or symbol is added only once. From-SVN: r147983
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