gcc/config/mips/7000.md

;; DFA-based pipeline description for the RM7000.
;;   Copyright (C) 2003-2026 Free Software Foundation, Inc.
;;
;; This file is part of GCC.

;; 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/>.

;; .........................
;;
;; The RM7000 is a dual-issue processor that can bundle instructions as:
;; {arith|load|store}{arith|imul|idiv|branch|float}
;;
;; Reference:
;;   "RM7000 Family User Manual, PMC-2002296"
;;
;; .........................

;; Use three automata to isolate long latency operations, reducing space.
(define_automaton "rm7000_other, rm7000_fdiv, rm7000_idiv")

;;
;; Describe the resources.
;;

;; Global
(define_cpu_unit "rm7_iss0,rm7_iss1" "rm7000_other")

;; Integer execution unit (M-Pipe).
(define_cpu_unit "ixum_addsub_agen" "rm7000_other")

;; Integer execution unit (F-Pipe).
(define_cpu_unit "ixuf_addsub" "rm7000_other")
(define_cpu_unit "ixuf_branch" "rm7000_other")
(define_cpu_unit "ixuf_mpydiv" "rm7000_other")
(define_cpu_unit "ixuf_mpydiv_iter" "rm7000_idiv")
;; Floating-point unit (F-Pipe).
(define_cpu_unit "fxuf_add" "rm7000_other")
(define_cpu_unit "fxuf_mpy" "rm7000_other")
(define_cpu_unit "fxuf_mpy_iter" "rm7000_fdiv")
(define_cpu_unit "fxuf_divsqrt" "rm7000_other")
(define_cpu_unit "fxuf_divsqrt_iter" "rm7000_fdiv")

(exclusion_set "ixuf_addsub"
	       "ixuf_branch,ixuf_mpydiv,fxuf_add,fxuf_mpy,fxuf_divsqrt")
(exclusion_set "ixuf_branch" "ixuf_mpydiv,fxuf_add,fxuf_mpy,fxuf_divsqrt")
(exclusion_set "ixuf_mpydiv" "fxuf_add,fxuf_mpy,fxuf_divsqrt")
(exclusion_set "fxuf_add" "fxuf_mpy,fxuf_divsqrt")
(exclusion_set "fxuf_mpy" "fxuf_divsqrt")

;; After branch any insn cannot be issued.
(absence_set "rm7_iss0,rm7_iss1" "ixuf_branch")

;;
;; Define reservations for unit name mnemonics or combinations.
;;

(define_reservation "rm7_iss" "rm7_iss0|rm7_iss1")
(define_reservation "rm7_single_dispatch" "rm7_iss0+rm7_iss1")

(define_reservation "rm7_iaddsub" "rm7_iss+(ixum_addsub_agen|ixuf_addsub)")
(define_reservation "rm7_imem" "rm7_iss+ixum_addsub_agen")
(define_reservation "rm7_impydiv" "rm7_iss+ixuf_mpydiv")
(define_reservation "rm7_impydiv_iter" "ixuf_mpydiv_iter")
(define_reservation "rm7_branch" "rm7_iss+ixuf_branch")

(define_reservation "rm7_fpadd"	"rm7_iss+fxuf_add")
(define_reservation "rm7_fpmpy"	"rm7_iss+fxuf_mpy")
(define_reservation "rm7_fpmpy_iter" "fxuf_mpy_iter")
(define_reservation "rm7_fpdivsqr" "rm7_iss+fxuf_divsqrt")
(define_reservation "rm7_fpdivsqr_iter" "fxuf_divsqrt_iter")

;;
;; Describe instruction reservations for integer operations.
;;

(define_insn_reservation "rm7_int_other" 1
  (and (eq_attr "cpu" "r7000")
       (eq_attr "type" "arith,shift,signext,slt,clz,const,condmove,logical,move,nop,trap"))
  "rm7_iaddsub")

(define_insn_reservation "rm7_ld" 2
  (and (eq_attr "cpu" "r7000")
       (eq_attr "type" "load,fpload,fpidxload"))
  "rm7_imem")

(define_insn_reservation "rm7_st" 1
  (and (eq_attr "cpu" "r7000")
       (eq_attr "type" "store,fpstore,fpidxstore"))
  "rm7_imem")

(define_insn_reservation "rm7_idiv_si" 36
  (and (eq_attr "cpu" "r7000")
       (and (eq_attr "type" "idiv")
	    (eq_attr "mode" "SI")))
  "rm7_impydiv+(rm7_impydiv_iter*36)")

(define_insn_reservation "rm7_idiv_di" 68
  (and (eq_attr "cpu" "r7000")
       (and (eq_attr "type" "idiv")
	    (eq_attr "mode" "DI")))
  "rm7_impydiv+(rm7_impydiv_iter*68)")

(define_insn_reservation "rm7_impy_si_mult" 5
  (and (eq_attr "cpu" "r7000")
       (and (eq_attr "type" "imul,imadd")
	    (eq_attr "mode" "SI")))
  "rm7_impydiv+(rm7_impydiv_iter*3)")

;; There are an additional 2 stall cycles.
(define_insn_reservation "rm7_impy_si_mul" 2
  (and (eq_attr "cpu" "r7000")
       (and (eq_attr "type" "imul3")
	    (eq_attr "mode" "SI")))
  "rm7_impydiv")

(define_insn_reservation "rm7_impy_di" 9
  (and (eq_attr "cpu" "r7000")
       (and (eq_attr "type" "imul,imul3")
	    (eq_attr "mode" "DI")))
  "rm7_impydiv+(rm7_impydiv_iter*8)")

;; Move to/from HI/LO.
(define_insn_reservation "rm7_mthilo" 3
  (and (eq_attr "cpu" "r7000")
       (eq_attr "type" "mthi,mtlo"))
  "rm7_impydiv")

(define_insn_reservation "rm7_mfhilo" 1
  (and (eq_attr "cpu" "r7000")
       (eq_attr "type" "mfhi,mflo"))
  "rm7_impydiv")

;; Move to/from fp coprocessor.
(define_insn_reservation "rm7_ixfer" 2
  (and (eq_attr "cpu" "r7000")
       (eq_attr "type" "mfc,mtc"))
  "rm7_iaddsub")

(define_insn_reservation "rm7_ibr" 3
  (and (eq_attr "cpu" "r7000")
       (eq_attr "type" "branch,jump,call"))
  "rm7_branch")

;;
;; Describe instruction reservations for the floating-point operations.
;;
(define_insn_reservation "rm7_fp_quick" 4
  (and (eq_attr "cpu" "r7000")
       (eq_attr "type" "fneg,fcmp,fabs,fmove"))
  "rm7_fpadd")

(define_insn_reservation "rm7_fp_other" 4
  (and (eq_attr "cpu" "r7000")
       (eq_attr "type" "fadd"))
  "rm7_fpadd")

(define_insn_reservation "rm7_fp_cvt" 4
  (and (eq_attr "cpu" "r7000")
       (eq_attr "type" "fcvt"))
  "rm7_fpadd")

(define_insn_reservation "rm7_fp_divsqrt_df" 36
  (and (eq_attr "cpu" "r7000")
       (and (eq_attr "type" "fdiv,frdiv,fsqrt")
	    (eq_attr "mode" "DF")))
  "rm7_fpdivsqr+(rm7_fpdivsqr_iter*36)")

(define_insn_reservation "rm7_fp_divsqrt_sf" 21
  (and (eq_attr "cpu" "r7000")
       (and (eq_attr "type" "fdiv,frdiv,fsqrt")
	    (eq_attr "mode" "SF")))
  "rm7_fpdivsqr+(rm7_fpdivsqr_iter*21)")

(define_insn_reservation "rm7_fp_rsqrt_df" 68
  (and (eq_attr "cpu" "r7000")
       (and (eq_attr "type" "frsqrt")
	    (eq_attr "mode" "DF")))
  "rm7_fpdivsqr+(rm7_fpdivsqr_iter*68)")

(define_insn_reservation "rm7_fp_rsqrt_sf" 38
  (and (eq_attr "cpu" "r7000")
       (and (eq_attr "type" "frsqrt")
	    (eq_attr "mode" "SF")))
  "rm7_fpdivsqr+(rm7_fpdivsqr_iter*38)")

(define_insn_reservation "rm7_fp_mpy_sf" 4
  (and (eq_attr "cpu" "r7000")
       (and (eq_attr "type" "fmul,fmadd")
	    (eq_attr "mode" "SF")))
  "rm7_fpmpy+rm7_fpmpy_iter")

(define_insn_reservation "rm7_fp_mpy_df" 5
  (and (eq_attr "cpu" "r7000")
       (and (eq_attr "type" "fmul,fmadd")
	    (eq_attr "mode" "DF")))
  "rm7_fpmpy+(rm7_fpmpy_iter*2)")

;; Force single-dispatch for unknown or multi.
(define_insn_reservation "rm7_unknown" 1
  (and (eq_attr "cpu" "r7000")
       (eq_attr "type" "unknown,multi,atomic,syncloop"))
  "rm7_single_dispatch")