+;; 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
+;; <http://www.gnu.org/licenses/>.
+
+;; 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,imul3"))
+ "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"))
+ "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")
+
+;; 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")
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