Jie Zhang wrote:
> * config/bfin/bfin-protos.h (bfin_hardware_loop): Declare.
> * config/bfin/bfin.c (basic-block.h): Include.
> (struct machine_function): New.
> (bfin_init_machine_status): New.
> (override_options): Initialize init_machine_status.
> (bfin_hardware_loop): New.
> (MAX_LOOP_DEPTH, MAX_LOOP_LENGTH): Define.
> (DEF_VEC_P (loop_info)): New.
> (DEF_VEC_ALLOC_P (loop_info,heap)): New.
> (struct loop_info): New.
> (loop_info): New typedef.
> (struct loop_work): New.
> (loop_work): New typedef.
> (DEF_VEC_O (loop_work)): New.
> (DEF_VEC_ALLOC_O (loop_work,heap)): New.
> (bfin_dump_loops): New.
> (bfin_bb_in_loop): New.
> (bfin_scan_loop): New.
> (bfin_optimize_loop): New.
> (bfin_reorg_loops): New.
> (bfin_reorg): Use bfin_reorg_loops.
> * config/bfin/bfin.h (FIRST_PSEUDO_REGISTER): Adjust for adding
> loop registers.
> (I_REGNO_P): Simplify.
> (DP_REGNO_P, DPREG_P): New macros.
> (REGISTER_NAMES, FIXED_REGISTERS, CALL_USED_REGISTERS,
> REG_ALLOC_ORDER): Add LT0, LT1, LC0, LC1, LB0, LB1.
> (enum reg_class, REG_CLASS_NAMES, REG_CLASS_CONTENTS):
> Add LT_REGS, LC_REGS, LB_REGS.
> (REG_CLASS_FROM_LETTER): Add 't' for LT_REGS, 'k' for LC_REGS,
> 'l' for LB_REGS.
> (REGNO_REG_CLASS): Deal with loop registers.
> * config/bfin/bfin.md: Add comment for 't', 'k', 'l' constraint
> letters.
> (REG_LT0, REG_LT1, REG_LC0, REG_LC1, REG_LB0, REG_LB1):
> New constants for loop registers.
> (UNSPEC_LSETUP_END): New.
> (seq_insns): New define_attr. Set it for appropriate insns.
> (movsi_insn): Add alternatives for move from/to
> loop count registers.
> (doloop_end): New define_expand.
> (loop_end): New define_insn.
> (define_split for bad doloop_end): New.
> (lsetup_with_autoinit): New define_insn.
> (lsetup_without_autoinit): New define_insn.
> (rep_movsi, rep_movhi): Clobber LT1, LC1, LB1.
> * config/bfin/predicates.md (lc_register_operand): New.
> (lt_register_operand): New.
> (lb_register_operand): New.
> (nondp_register_operand): New.
> (nondp_reg_or_memory_operand): New.
> * doc/md.texi: Document Blackfin new 't', 'k', 'l' constraint letters.
Please install. Thanks!