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gcc/ * optabs.c (shift_optab_p, commutative_optab_p): New functions, split out from expand_binop. (avoid_expensive_constant): New function. (expand_binop_directly): Remove commutative_op argument and call cummutative_optab_p instead. Do not change op0 or op1 when swapping xop0 and xop1. Apply avoid_expensive_constant to each argument after potential swapping. Enforce the canonical order of commutative operands. (expand_binop): Use shift_optab_p and commutative_optab_p. Update the calls to expand_binop_directly. Only force constants into registers when widening an operation. Only swap operands once a direct expansion has been rejected. (expand_twoval_binop): Only force constants into registers when using a direct expansion. From-SVN: r127991
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