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;; DFA-based pipeline descriptions for MIPS Technologies 24K core.

;; Contributed by Chao-ying Fu (fu@mips.com), Nigel Stephens (nigel@mips.com)

;;   and David Ung (davidu@mips.com)

;;

;; The 24K is a single-issue processor with a half-clocked fpu.

;; The 24Kx is 24k with 1:1 clocked fpu.

;;

;; References:

;;   "MIPS32 24K Processor Core Family Software User's Manual, Rev 3.04."

;;

;; Copyright (C) 2005 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 2, 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 COPYING.  If not, write to the

;; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,

;; MA 02110-1301, USA.

(define_automaton "r24k_cpu, r24k_mdu, r24k_fpu")

;; Integer execution unit.

(define_cpu_unit "r24k_iss"             "r24k_cpu")

(define_cpu_unit "r24k_ixu_arith"       "r24k_cpu")

(define_cpu_unit "r24k_mul3a"           "r24k_mdu")

(define_cpu_unit "r24k_mul3b"           "r24k_mdu")

(define_cpu_unit "r24k_mul3c"           "r24k_mdu")

;; --------------------------------------------------------------

;; Producers

;; --------------------------------------------------------------

;; 1. Loads: lb, lbu, lh, lhu, ll, lw, lwl, lwr, lwpc, lwxs

(define_insn_reservation "r24k_int_load" 2

  (and (eq_attr "cpu" "24k,24kx")

       (eq_attr "type" "load"))

  "r24k_iss+r24k_ixu_arith")

;; 2. Arithmetic: add, addi, addiu, addiupc, addu, and, andi, clo, clz,

;;    ext, ins, lui, movn, movz, nor, or, ori, rotr, rotrv, seb, seh, sll,

;;    sllv, slt, slti, sltiu, sltu, sra, srav, srl, srlv, sub, subu, wsbh,

;;    xor, xori

;; (movn/movz is not matched, we'll need to split condmov to

;;  differentiate between integer/float moves)

(define_insn_reservation "r24k_int_arith" 1

  (and (eq_attr "cpu" "24k,24kx")

       (eq_attr "type" "arith,const,nop,shift,slt"))

  "r24k_iss+r24k_ixu_arith")

;; 3. Links: bgezal, bgezall, bltzal, bltzall, jal, jalr, jalx

;; 3a. jr/jalr consumer

(define_insn_reservation "r24k_int_jump" 1

  (and (eq_attr "cpu" "24k,24kx")

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

  "r24k_iss+r24k_ixu_arith")

;; 3b. branch consumer

(define_insn_reservation "r24k_int_branch" 1

  (and (eq_attr "cpu" "24k,24kx")

       (eq_attr "type" "branch"))

  "r24k_iss+r24k_ixu_arith")

;; 4. MDU: fully pipelined multiplier

;; mult - delivers result to hi/lo in 1 cycle (pipelined)

(define_insn_reservation "r24k_int_mult" 1

  (and (eq_attr "cpu" "24k,24kx")

       (eq_attr "type" "imul"))

  "r24k_iss+(r24k_mul3a|r24k_mul3b|r24k_mul3c)")

;; madd, msub - delivers result to hi/lo in 1 cycle (pipelined)

(define_insn_reservation "r24k_int_madd" 1

  (and (eq_attr "cpu" "24k,24kx")

       (eq_attr "type" "imadd"))

  "r24k_iss+(r24k_mul3a|r24k_mul3b|r24k_mul3c)")

;; mul - delivers result to gpr in 5 cycles

(define_insn_reservation "r24k_int_mul3" 5

  (and (eq_attr "cpu" "24k,24kx")

       (eq_attr "type" "imul3"))

  "r24k_iss+(r24k_mul3a|r24k_mul3b|r24k_mul3c)*5")

;; mfhi, mflo, mflhxu - deliver result to gpr in 5 cycles

(define_insn_reservation "r24k_int_mfhilo" 5

  (and (eq_attr "cpu" "24k,24kx")

       (eq_attr "type" "mfhilo"))

  "r24k_iss+(r24k_mul3a|r24k_mul3b|r24k_mul3c)")

;; mthi, mtlo, mtlhx - deliver result to hi/lo, thence madd, handled as bypass

(define_insn_reservation "r24k_int_mthilo" 1

  (and (eq_attr "cpu" "24k,24kx")

       (eq_attr "type" "mthilo"))

  "r24k_iss+(r24k_mul3a|r24k_mul3b|r24k_mul3c)")

;; div - default to 36 cycles for 32bit operands.  Faster for 24bit, 16bit and

;; 8bit, but is tricky to identify.

(define_insn_reservation "r24k_int_div" 36

  (and (eq_attr "cpu" "24k,24kx")

       (eq_attr "type" "idiv"))

  "r24k_iss+(r24k_mul3a+r24k_mul3b+r24k_mul3c)*36")

;; 5. Cop: cfc1, di, ei, mfc0, mtc0

;; (Disabled until we add proper cop0 support)

;;(define_insn_reservation "r24k_int_cop" 3

;;  (and (eq_attr "cpu" "24k,24kx")

;;       (eq_attr "type" "cop0"))

;;  "r24k_iss+r24k_ixu_arith")

;; 6. Store

(define_insn_reservation "r24k_int_store" 1

  (and (eq_attr "cpu" "24k,24kx")

       (and (eq_attr "type" "store")

            (eq_attr "mode" "!unknown")))

  "r24k_iss+r24k_ixu_arith")

;; 6.1 Special case - matches the cprestore pattern which don't set the mode

;;     attrib. This avoids being set as r24k_int_store and have it checked

;;     against store_data_bypass_p, which would then fail because cprestore

;;     does not have a normal SET pattern.

(define_insn_reservation "r24k_unknown_store" 1

  (and (eq_attr "cpu" "24k,24kx")

       (and (eq_attr "type" "store")

            (eq_attr "mode" "unknown")))

  "r24k_iss+r24k_ixu_arith")

;; 7. Multiple instructions

(define_insn_reservation "r24k_int_multi" 1

  (and (eq_attr "cpu" "24k,24kx")

       (eq_attr "type" "multi"))

  "r24k_iss+r24k_ixu_arith+r24k_fpu_arith+(r24k_mul3a+r24k_mul3b+r24k_mul3c)")

;; 8. Unknowns - Currently these include blockage, consttable and alignment

;;    rtls. They do not really affect scheduling latency, (blockage affects

;;    scheduling via log links, but not used here).

(define_insn_reservation "r24k_int_unknown" 0

  (and (eq_attr "cpu" "24k,24kx")

       (eq_attr "type" "unknown"))

  "r24k_iss")

;; 9. Prefetch

(define_insn_reservation "r24k_int_prefetch" 1

  (and (eq_attr "cpu" "24k,24kx")

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

  "r24k_iss+r24k_ixu_arith")

;; --------------------------------------------------------------

;; Bypass to Consumer

;; --------------------------------------------------------------

;; load->next use :  2 cycles (Default)

;; load->load base:  3 cycles

;; load->store base: 3 cycles

;; load->prefetch:   3 cycles

(define_bypass 3 "r24k_int_load" "r24k_int_load")

(define_bypass 3 "r24k_int_load" "r24k_int_store" "!store_data_bypass_p")

(define_bypass 3 "r24k_int_load" "r24k_int_prefetch")

;; arith->next use :  1 cycles (Default)

;; arith->load base:  2 cycles

;; arith->store base: 2 cycles

;; arith->prefetch:   2 cycles

(define_bypass 2 "r24k_int_arith" "r24k_int_load")

(define_bypass 2 "r24k_int_arith" "r24k_int_store" "!store_data_bypass_p")

(define_bypass 2 "r24k_int_arith" "r24k_int_prefetch")

;; mul3->next use : 5 cycles (default)

;; mul3->l/s base : 6 cycles

;; mul3->prefetch : 6 cycles

(define_bypass 6 "r24k_int_mul3" "r24k_int_load")

(define_bypass 6 "r24k_int_mul3" "r24k_int_store" "!store_data_bypass_p")

(define_bypass 6 "r24k_int_mul3" "r24k_int_prefetch")

;; mfhilo->next use  : 5 cycles (default)

;; mfhilo->l/s base  : 6 cycles

;; mfhilo->prefetch  : 6 cycles

;; mthilo->madd/msub : 2 cycle (only for mthi/lo not mfhi/lo)

(define_bypass 6 "r24k_int_mfhilo" "r24k_int_load")

(define_bypass 6 "r24k_int_mfhilo" "r24k_int_store" "!store_data_bypass_p")

(define_bypass 6 "r24k_int_mfhilo" "r24k_int_prefetch")

(define_bypass 2 "r24k_int_mthilo" "r24k_int_madd")

;; cop->next use : 3 cycles (Default)

;; cop->l/s base : 4 cycles

;; (define_bypass 4 "r24k_int_cop" "r24k_int_load")

;; (define_bypass 4 "r24k_int_cop" "r24k_int_store" "!store_data_bypass_p")

;; multi->next use : 1 cycles (Default)

;; multi->l/s base : 2 cycles

;; multi->prefetch : 2 cycles

(define_bypass 2 "r24k_int_multi" "r24k_int_load")

(define_bypass 2 "r24k_int_multi" "r24k_int_store" "!store_data_bypass_p")

(define_bypass 2 "r24k_int_multi" "r24k_int_prefetch")

;; --------------------------------------------------------------

;; Floating Point Instructions

;; --------------------------------------------------------------

(define_cpu_unit "r24k_fpu_arith" "r24k_fpu")

;; The 24k is a single issue cpu, and the fpu runs at half clock speed,

;; so each fpu instruction ties up the shared instruction scheduler for

;; 1 cycle, and the fpu scheduler for 2 cycles.

;;

;; These timings are therefore twice the values in the 24K manual,

;; which are quoted in fpu clocks.

;;

;; The 24kx is a 24k configured with 1:1 cpu and fpu, so use

;; the unscaled timings

(define_reservation "r24k_fpu_iss"      "r24k_iss+(r24k_fpu_arith*2)")

;; fadd, fabs, fneg

(define_insn_reservation "r24k_fadd" 8

  (and (eq_attr "cpu" "24k")

       (eq_attr "type" "fadd,fabs,fneg"))

  "r24k_fpu_iss")

;; fmove, fcmove

(define_insn_reservation "r24k_fmove" 8

  (and (eq_attr "cpu" "24k")

       (eq_attr "type" "fmove,condmove"))

  "r24k_fpu_iss")

;; fload

(define_insn_reservation "r24k_fload" 6

  (and (eq_attr "cpu" "24k")

       (eq_attr "type" "fpload,fpidxload"))

  "r24k_fpu_iss")

;; fstore

(define_insn_reservation "r24k_fstore" 2

  (and (eq_attr "cpu" "24k")

       (eq_attr "type" "fpstore"))

  "r24k_fpu_iss")

;; fmul, fmadd

(define_insn_reservation "r24k_fmul_sf" 8

  (and (eq_attr "cpu" "24k")

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

            (eq_attr "mode" "SF")))

  "r24k_fpu_iss")

(define_insn_reservation "r24k_fmul_df" 10

  (and (eq_attr "cpu" "24k")

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

            (eq_attr "mode" "DF")))

  "r24k_fpu_iss,(r24k_fpu_arith*2)")

;; fdiv, fsqrt, frsqrt

(define_insn_reservation "r24k_fdiv_sf" 34

  (and (eq_attr "cpu" "24k")

       (and (eq_attr "type" "fdiv,fsqrt,frsqrt")

            (eq_attr "mode" "SF")))

  "r24k_fpu_iss,(r24k_fpu_arith*26)")

(define_insn_reservation "r24k_fdiv_df" 64

  (and (eq_attr "cpu" "24k")

       (and (eq_attr "type" "fdiv,fsqrt")

            (eq_attr "mode" "DF")))

  "r24k_fpu_iss,(r24k_fpu_arith*56)")

;; frsqrt

(define_insn_reservation "r24k_frsqrt_df" 70

  (and (eq_attr "cpu" "24k")

       (and (eq_attr "type" "frsqrt")

            (eq_attr "mode" "DF")))

  "r24k_fpu_iss,(r24k_fpu_arith*60)")

;; fcmp

(define_insn_reservation "r24k_fcmp" 4

  (and (eq_attr "cpu" "24k")

       (eq_attr "type" "fcmp"))

  "r24k_fpu_iss")

;; fcmp -> movf.fmt & movt.fmt bypass (dependency must be on the condition)

(define_bypass 2 "r24k_fcmp" "r24k_fmove")

;; fcvt (cvt.d.s, cvt.[sd].[wl])

(define_insn_reservation "r24k_fcvt_i2f_s2d" 8

  (and (eq_attr "cpu" "24k")

       (and (eq_attr "type" "fcvt")

            (eq_attr "cnv_mode" "I2S,I2D,S2D")))

  "r24k_fpu_iss")

;; fcvt (cvt.s.d)

(define_insn_reservation "r24k_fcvt_s2d" 12

  (and (eq_attr "cpu" "24k")

       (and (eq_attr "type" "fcvt")

            (eq_attr "cnv_mode" "D2S")))

  "r24k_fpu_iss")

;; fcvt (cvt.[wl].[sd], etc)

(define_insn_reservation "r24k_fcvt_f2i" 10

  (and (eq_attr "cpu" "24k")

       (and (eq_attr "type" "fcvt")

            (eq_attr "cnv_mode" "S2I,D2I")))

  "r24k_fpu_iss")

;; fxfer (mfc1, mfhc1, mtc1, mthc1)

(define_insn_reservation "r24k_fxfer" 4

  (and (eq_attr "cpu" "24k")

       (eq_attr "type" "xfer"))

  "r24k_fpu_iss")

;; --------------------------------------------------------------

;; Bypass to Consumer

;; --------------------------------------------------------------

;; r24k_fcvt_f2i->l/s base : 11 cycles

;; r24k_fcvt_f2i->prefetch : 11 cycles

(define_bypass 11 "r24k_fcvt_f2i" "r24k_int_load")

(define_bypass 11 "r24k_fcvt_f2i" "r24k_int_store" "!store_data_bypass_p")

(define_bypass 11 "r24k_fcvt_f2i" "r24k_int_prefetch")

;; r24k_fxfer->l/s base : 5 cycles

;; r24k_fxfer->prefetch : 5 cycles

(define_bypass 5 "r24k_fxfer" "r24k_int_load")

(define_bypass 5 "r24k_fxfer" "r24k_int_store" "!store_data_bypass_p")

(define_bypass 5 "r24k_fxfer" "r24k_int_prefetch")

;; --------------------------------------------------------------

;; The 24kx is a 24k configured with 1:1 cpu and fpu, so use

;; the unscaled timings

;; --------------------------------------------------------------

(define_reservation "r24kx_fpu_iss"     "r24k_iss+r24k_fpu_arith")

;; fadd, fabs, fneg

(define_insn_reservation "r24kx_fadd" 4

  (and (eq_attr "cpu" "24kx")

       (eq_attr "type" "fadd,fabs,fneg"))

  "r24kx_fpu_iss")

;; fmove, fcmove

(define_insn_reservation "r24kx_fmove" 4

  (and (eq_attr "cpu" "24kx")

       (eq_attr "type" "fmove,condmove"))

  "r24kx_fpu_iss")

;; fload

(define_insn_reservation "r24kx_fload" 3

  (and (eq_attr "cpu" "24kx")

       (eq_attr "type" "fpload,fpidxload"))

  "r24kx_fpu_iss")

;; fstore

(define_insn_reservation "r24kx_fstore" 1

  (and (eq_attr "cpu" "24kx")

       (eq_attr "type" "fpstore"))

  "r24kx_fpu_iss")

;; fmul, fmadd

(define_insn_reservation "r24kx_fmul_sf" 4

  (and (eq_attr "cpu" "24kx")

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

            (eq_attr "mode" "SF")))

  "r24kx_fpu_iss")

(define_insn_reservation "r24kx_fmul_df" 5

  (and (eq_attr "cpu" "24kx")

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

            (eq_attr "mode" "DF")))

  "r24kx_fpu_iss,r24k_fpu_arith")

;; fdiv, fsqrt, frsqrt

(define_insn_reservation "r24kx_fdiv_sf" 17

  (and (eq_attr "cpu" "24kx")

       (and (eq_attr "type" "fdiv,fsqrt,frsqrt")

            (eq_attr "mode" "SF")))

  "r24kx_fpu_iss,(r24k_fpu_arith*13)")

(define_insn_reservation "r24kx_fdiv_df" 32

  (and (eq_attr "cpu" "24kx")

       (and (eq_attr "type" "fdiv,fsqrt")

            (eq_attr "mode" "DF")))

  "r24kx_fpu_iss,(r24k_fpu_arith*28)")

;; frsqrt

(define_insn_reservation "r24kx_frsqrt_df" 35

  (and (eq_attr "cpu" "24kx")

       (and (eq_attr "type" "frsqrt")

            (eq_attr "mode" "DF")))

  "r24kx_fpu_iss,(r24k_fpu_arith*30)")

;; fcmp

(define_insn_reservation "r24kx_fcmp" 2

  (and (eq_attr "cpu" "24kx")

       (eq_attr "type" "fcmp"))

  "r24kx_fpu_iss")

;; fcmp -> movf.fmt & movt.fmt bypass (dependency must be on the condition)

(define_bypass 1 "r24kx_fcmp" "r24kx_fmove")

;; fcvt (cvt.d.s, cvt.[sd].[wl])

(define_insn_reservation "r24kx_fcvt_i2f_s2d" 4

  (and (eq_attr "cpu" "24kx")

       (and (eq_attr "type" "fcvt")

            (eq_attr "cnv_mode" "I2S,I2D,S2D")))

  "r24kx_fpu_iss")

;; fcvt (cvt.s.d)

(define_insn_reservation "r24kx_fcvt_s2d" 6

  (and (eq_attr "cpu" "24kx")

       (and (eq_attr "type" "fcvt")

            (eq_attr "cnv_mode" "D2S")))

  "r24kx_fpu_iss")

;; fcvt (cvt.[wl].[sd], etc)

(define_insn_reservation "r24kx_fcvt_f2i" 5

  (and (eq_attr "cpu" "24kx")

       (and (eq_attr "type" "fcvt")

            (eq_attr "cnv_mode" "S2I,D2I")))

  "r24kx_fpu_iss")

;; fxfer (mfc1, mfhc1, mtc1, mthc1)

(define_insn_reservation "r24kx_fxfer" 2

  (and (eq_attr "cpu" "24kx")

       (eq_attr "type" "xfer"))

  "r24kx_fpu_iss")

;; --------------------------------------------------------------

;; Bypass to Consumer

;; --------------------------------------------------------------

;; r24kx_fcvt_f2i->l/s base : 6 cycles

;; r24kx_fcvt_f2i->prefetch : 6 cycles

(define_bypass 6 "r24kx_fcvt_f2i" "r24k_int_load")

(define_bypass 6 "r24kx_fcvt_f2i" "r24k_int_store" "!store_data_bypass_p")

(define_bypass 6 "r24kx_fcvt_f2i" "r24k_int_prefetch")

;; r24kx_fxfer->l/s base : 3 cycles

;; r24kx_fxfer->prefetch : 3 cycles

(define_bypass 3 "r24kx_fxfer" "r24k_int_load")

(define_bypass 3 "r24kx_fxfer" "r24k_int_store" "!store_data_bypass_p")

(define_bypass 3 "r24kx_fxfer" "r24k_int_prefetch")