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* target.h (struct gcc_target): Add mode_rep_extended. * rtlanal.c (num_sign_bit_copies_in_rep): New global. (init_num_sign_bit_copies_in_rep): Initialize it using mode_rep_extended. (truncate_to_mode): Use it. (init_rtlanal): Call init_num_sign_bit_copies_in_rep. * targhooks.h (default_mode_rep_extended): Declare it. * targhooks.c (default_mode_rep_extended): Define it. * target-def.h (TARGET_MODE_REP_EXTENDED): New macro. Default to default_mode_rep_extended. (TARGET_INITIALIZER): Include it. * doc/tm.texi (Misc): Document it. * config/mips/mips.c (TARGET_TRUNCATED_TO_MODE): Override it. (mips_truncated_to_mode): New function. From-SVN: r112998
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