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;; Pipeline model for ST Microelectronics Loongson-2E/2F cores.

;; Copyright (C) 2008 Free Software Foundation, Inc.

;; Contributed by CodeSourcery.

;;

;; GCC is free software; you can redistribute it and/or modify

;; it under the terms of the GNU General Public License as published by

;; the Free Software Foundation; either version 3, or (at your option)

;; any later version.

;;

;; GCC is distributed in the hope that it will be useful,

;; but WITHOUT ANY WARRANTY; without even the implied warranty of

;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

;; GNU General Public License for more details.

;;

;; You should have received a copy of the GNU General Public License

;; along with GCC; see the file COPYING3.  If not see

;; .

;; Automaton for integer instructions.

(define_automaton "ls2_alu")

;; ALU1 and ALU2.

;; We need to query these units to adjust round-robin counter.

(define_query_cpu_unit "ls2_alu1_core,ls2_alu2_core" "ls2_alu")

;; Pseudo units to help modeling of ALU1/2 round-robin dispatch strategy.

(define_cpu_unit "ls2_alu1_turn,ls2_alu2_turn" "ls2_alu")

;; Pseudo units to enable/disable ls2_alu[12]_turn units.

;; ls2_alu[12]_turn unit can be subscribed only after ls2_alu[12]_turn_enabled

;; unit is subscribed.

(define_cpu_unit "ls2_alu1_turn_enabled,ls2_alu2_turn_enabled" "ls2_alu")

(presence_set "ls2_alu1_turn" "ls2_alu1_turn_enabled")

(presence_set "ls2_alu2_turn" "ls2_alu2_turn_enabled")

;; Reservations for ALU1 (ALU2) instructions.

;; Instruction goes to ALU1 (ALU2) and makes next ALU1/2 instruction to

;; be dispatched to ALU2 (ALU1).

(define_reservation "ls2_alu1"

  "(ls2_alu1_core+ls2_alu2_turn_enabled)|ls2_alu1_core")

(define_reservation "ls2_alu2"

  "(ls2_alu2_core+ls2_alu1_turn_enabled)|ls2_alu2_core")

;; Reservation for ALU1/2 instructions.

;; Instruction will go to ALU1 iff ls2_alu1_turn_enabled is subscribed and

;; switch the turn to ALU2 by subscribing ls2_alu2_turn_enabled.

;; Or to ALU2 otherwise.

(define_reservation "ls2_alu"

  "(ls2_alu1_core+ls2_alu1_turn+ls2_alu2_turn_enabled)

   |(ls2_alu1_core+ls2_alu1_turn)

   |(ls2_alu2_core+ls2_alu2_turn+ls2_alu1_turn_enabled)

   |(ls2_alu2_core+ls2_alu2_turn)")

;; Automaton for floating-point instructions.

(define_automaton "ls2_falu")

;; FALU1 and FALU2.

;; We need to query these units to adjust round-robin counter.

(define_query_cpu_unit "ls2_falu1_core,ls2_falu2_core" "ls2_falu")

;; Pseudo units to help modeling of FALU1/2 round-robin dispatch strategy.

(define_cpu_unit "ls2_falu1_turn,ls2_falu2_turn" "ls2_falu")

;; Pseudo units to enable/disable ls2_falu[12]_turn units.

;; ls2_falu[12]_turn unit can be subscribed only after

;; ls2_falu[12]_turn_enabled unit is subscribed.

(define_cpu_unit "ls2_falu1_turn_enabled,ls2_falu2_turn_enabled" "ls2_falu")

(presence_set "ls2_falu1_turn" "ls2_falu1_turn_enabled")

(presence_set "ls2_falu2_turn" "ls2_falu2_turn_enabled")

;; Reservations for FALU1 (FALU2) instructions.

;; Instruction goes to FALU1 (FALU2) and makes next FALU1/2 instruction to

;; be dispatched to FALU2 (FALU1).

(define_reservation "ls2_falu1"

  "(ls2_falu1_core+ls2_falu2_turn_enabled)|ls2_falu1_core")

(define_reservation "ls2_falu2"

  "(ls2_falu2_core+ls2_falu1_turn_enabled)|ls2_falu2_core")

;; Reservation for FALU1/2 instructions.

;; Instruction will go to FALU1 iff ls2_falu1_turn_enabled is subscribed and

;; switch the turn to FALU2 by subscribing ls2_falu2_turn_enabled.

;; Or to FALU2 otherwise.

(define_reservation "ls2_falu"

  "(ls2_falu1+ls2_falu1_turn+ls2_falu2_turn_enabled)

   |(ls2_falu1+ls2_falu1_turn)

   |(ls2_falu2+ls2_falu2_turn+ls2_falu1_turn_enabled)

   |(ls2_falu2+ls2_falu2_turn)")

;; The following 4 instructions each subscribe one of

;; ls2_[f]alu{1,2}_turn_enabled units according to this attribute.

;; These instructions are used in mips.c: sched_ls2_dfa_post_advance_cycle.

(define_attr "ls2_turn_type" "alu1,alu2,falu1,falu2,unknown"

  (const_string "unknown"))

;; Subscribe ls2_alu1_turn_enabled.

(define_insn "ls2_alu1_turn_enabled_insn"

  [(unspec [(const_int 0)] UNSPEC_LOONGSON_ALU1_TURN_ENABLED_INSN)]

  "TUNE_LOONGSON_2EF"

  { gcc_unreachable (); }

  [(set_attr "ls2_turn_type" "alu1")])

(define_insn_reservation "ls2_alu1_turn_enabled" 0

  (eq_attr "ls2_turn_type" "alu1")

  "ls2_alu1_turn_enabled")

;; Subscribe ls2_alu2_turn_enabled.

(define_insn "ls2_alu2_turn_enabled_insn"

  [(unspec [(const_int 0)] UNSPEC_LOONGSON_ALU2_TURN_ENABLED_INSN)]

  "TUNE_LOONGSON_2EF"

  { gcc_unreachable (); }

  [(set_attr "ls2_turn_type" "alu2")])

(define_insn_reservation "ls2_alu2_turn_enabled" 0

  (eq_attr "ls2_turn_type" "alu2")

  "ls2_alu2_turn_enabled")

;; Subscribe ls2_falu1_turn_enabled.

(define_insn "ls2_falu1_turn_enabled_insn"

  [(unspec [(const_int 0)] UNSPEC_LOONGSON_FALU1_TURN_ENABLED_INSN)]

  "TUNE_LOONGSON_2EF"

  { gcc_unreachable (); }

  [(set_attr "ls2_turn_type" "falu1")])

(define_insn_reservation "ls2_falu1_turn_enabled" 0

  (eq_attr "ls2_turn_type" "falu1")

  "ls2_falu1_turn_enabled")

;; Subscribe ls2_falu2_turn_enabled.

(define_insn "ls2_falu2_turn_enabled_insn"

  [(unspec [(const_int 0)] UNSPEC_LOONGSON_FALU2_TURN_ENABLED_INSN)]

  "TUNE_LOONGSON_2EF"

  { gcc_unreachable (); }

  [(set_attr "ls2_turn_type" "falu2")])

(define_insn_reservation "ls2_falu2_turn_enabled" 0

  (eq_attr "ls2_turn_type" "falu2")

  "ls2_falu2_turn_enabled")

;; Automaton for memory operations.

(define_automaton "ls2_mem")

;; Memory unit.

(define_query_cpu_unit "ls2_mem" "ls2_mem")

;; Reservation for integer instructions.

(define_insn_reservation "ls2_alu" 2

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "arith,condmove,const,logical,mfhilo,move,

                        mthilo,nop,shift,signext,slt"))

  "ls2_alu")

;; Reservation for branch instructions.

(define_insn_reservation "ls2_branch" 2

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "branch,jump,call,trap"))

  "ls2_alu1")

;; Reservation for integer multiplication instructions.

(define_insn_reservation "ls2_imult" 5

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "imul,imul3nc"))

  "ls2_alu2,ls2_alu2_core")

;; Reservation for integer division / remainder instructions.

;; These instructions use the SRT algorithm and hence take 2-38 cycles.

(define_insn_reservation "ls2_idiv" 20

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "idiv,idiv3"))

  "ls2_alu2,ls2_alu2_core*18")

;; Reservation for memory load instructions.

(define_insn_reservation "ls2_load" 5

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "load,fpload,mfc,mtc"))

  "ls2_mem")

(define_insn_reservation "ls2_prefetch" 0

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "prefetch,prefetchx"))

  "ls2_mem")

;; Reservation for memory store instructions.

;; With stores we assume they don't alias with dependent loads.

;; Therefore we set the latency to zero.

(define_insn_reservation "ls2_store" 0

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "store,fpstore"))

  "ls2_mem")

;; Reservation for floating-point instructions of latency 3.

(define_insn_reservation "ls2_fp3" 3

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "fabs,fneg,fcmp,fmove"))

  "ls2_falu1")

;; Reservation for floating-point instructions of latency 5.

(define_insn_reservation "ls2_fp5" 5

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "fcvt"))

  "ls2_falu1")

;; Reservation for floating-point instructions that can go

;; to either of FALU1/2 units.

(define_insn_reservation "ls2_falu" 7

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "fadd,fmul,fmadd"))

  "ls2_falu")

;; Reservation for floating-point division / remainder instructions.

;; These instructions use the SRT algorithm and hence take a variable amount

;; of cycles:

;; div.s takes 5-11 cycles

;; div.d takes 5-18 cycles

(define_insn_reservation "ls2_fdiv" 9

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "fdiv"))

  "ls2_falu2,ls2_falu2_core*7")

;; Reservation for floating-point sqrt instructions.

;; These instructions use the SRT algorithm and hence take a variable amount

;; of cycles:

;; sqrt.s takes 5-17 cycles

;; sqrt.d takes 5-32 cycles

(define_insn_reservation "ls2_fsqrt" 15

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "fsqrt"))

  "ls2_falu2,ls2_falu2_core*13")

;; Two consecutive ALU instructions.

(define_insn_reservation "ls2_multi" 4

  (and (eq_attr "cpu" "loongson_2e,loongson_2f")

       (eq_attr "type" "multi"))

  "(ls2_alu1,ls2_alu2_core)|(ls2_alu2,ls2_alu1_core)")

;; Reservation for everything else.  Normally, this reservation

;; will only be used to handle cases like compiling for non-loongson

;; CPUs with -mtune=loongson2?.

;;

;; This reservation depends upon the fact that DFA will check

;; reservations in the same order as they appear in the file.

(define_insn_reservation "ls2_unknown" 1

  (eq_attr "cpu" "loongson_2e,loongson_2f")

  "ls2_alu1_core+ls2_alu2_core+ls2_falu1_core+ls2_falu2_core+ls2_mem")