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* expr.c [CLEAR_RATIO]: New macro defining the maximum number of move instructions to use when clearing memory, c.f. MOVE_RATIO. [CLEAR_BY_PIECES]: New macro, using CLEAR_RATIO, to determine whether clear_by_pieces should be used to clear storage. (clear_storage): Use CLEAR_BY_PIECES instead of MOVE_BY_PIECES. * doc/tm.texi: Document these two new target macros. From-SVN: r55429
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