1 ;; Scheduling description for GR5.
2 ;; Copyright (C) 2013-2018 Free Software Foundation, Inc.
4 ;; This file is part of GCC.
6 ;; GCC is free software; you can redistribute it and/or modify
7 ;; it under the terms of the GNU General Public License as published by
8 ;; the Free Software Foundation; either version 3, or (at your option)
11 ;; GCC is distributed in the hope that it will be useful,
12 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ;; GNU General Public License for more details.
16 ;; You should have received a copy of the GNU General Public License
17 ;; along with GCC; see the file COPYING3. If not see
18 ;; <http://www.gnu.org/licenses/>.
20 ;; GR5 is a single-issue processor.
22 ;; CPU execution units:
24 ;; issue Only one instruction can be issued on a given cycle.
25 ;; There is no need to model the CPU pipeline in any
26 ;; more detail than this.
28 ;; mem Memory Unit: all accesses to memory.
30 ;; eam Extended Arithmetic Module: multiply, divide and
33 ;; fp_slot[0|1|2|3] The 4 FIFO slots of the floating-point unit. Only
34 ;; the instruction at slot 0 can execute, but an FP
35 ;; instruction can issue if any of the slots is free.
37 (define_automaton "gr5,gr5_fpu")
39 (define_cpu_unit "gr5_issue" "gr5")
40 (define_cpu_unit "gr5_mem" "gr5")
41 (define_cpu_unit "gr5_eam" "gr5")
42 (define_cpu_unit "gr5_fp_slot0,gr5_fp_slot1,gr5_fp_slot2,gr5_fp_slot3" "gr5_fpu")
44 ;; The CPU instructions which write to general registers and so do not totally
45 ;; complete until they reach the store stage of the pipeline. This is not the
46 ;; complete storage register class: mem_reg, eam_reg and fpu_reg are excluded
47 ;; since we must keep the reservation sets non-overlapping.
48 (define_insn_reservation "gr5_storage_register" 1
49 (and (eq_attr "cpu" "gr5")
50 (eq_attr "type" "imm_reg,arith,arith2,logic,call"))
53 (define_insn_reservation "gr5_read_mem" 1
54 (and (eq_attr "cpu" "gr5")
55 (eq_attr "type" "mem_reg"))
56 "gr5_issue + gr5_mem")
58 ;; The latency of 2 and the reservation of gr5_mem on the second cycle ensures
59 ;; that no reads will be scheduled on the second cycle, which would otherwise
60 ;; stall the pipeline for 1 cycle.
61 (define_insn_reservation "gr5_write_mem" 2
62 (and (eq_attr "cpu" "gr5")
63 (eq_attr "type" "reg_mem"))
66 ;; Try to avoid the pipeline hazard of addressing off a register that has
67 ;; not yet been stored.
68 (define_bypass 2 "gr5_storage_register" "gr5_read_mem" "gr5_hazard_bypass_p")
69 (define_bypass 2 "gr5_storage_register" "gr5_write_mem" "gr5_hazard_bypass_p")
70 (define_bypass 2 "gr5_read_mem" "gr5_read_mem" "gr5_hazard_bypass_p")
71 (define_bypass 2 "gr5_read_mem" "gr5_write_mem" "gr5_hazard_bypass_p")
73 ;; Other CPU instructions complete by the process stage.
74 (define_insn_reservation "gr5_cpu_other" 1
75 (and (eq_attr "cpu" "gr5")
76 (eq_attr "type" "abs_branch,branch,cmp,ret,rfi,dsi,nop"))
81 (define_insn_reservation "gr5_write_eam" 1
82 (and (eq_attr "cpu" "gr5")
83 (eq_attr "type" "reg_eam"))
86 (define_reservation "gr5_issue_eam" "(gr5_issue + gr5_eam)")
88 (define_insn_reservation "gr5_read_eam" 1
89 (and (eq_attr "cpu" "gr5")
90 (eq_attr "type" "eam_reg"))
93 ;; Try to avoid the pipeline hazard of addressing off a register that has
94 ;; not yet been stored.
95 (define_bypass 2 "gr5_read_eam" "gr5_read_mem" "gr5_hazard_bypass_p")
96 (define_bypass 2 "gr5_read_eam" "gr5_write_mem" "gr5_hazard_bypass_p")
98 (define_insn_reservation "gr5_shiftdi" 1
99 (and (eq_attr "cpu" "gr5")
100 (eq_attr "type" "shiftdi"))
103 (define_insn_reservation "gr5_mul" 3
104 (and (eq_attr "cpu" "gr5")
105 (eq_attr "type" "mul"))
106 "gr5_issue_eam, gr5_eam*2")
108 (define_insn_reservation "gr5_div" 34
109 (and (eq_attr "cpu" "gr5")
110 (eq_attr "type" "div"))
111 "gr5_issue_eam, gr5_eam*33")
113 (define_insn_reservation "gr5_divd" 66
114 (and (eq_attr "cpu" "gr5")
115 (eq_attr "type" "divd"))
116 "gr5_issue_eam, gr5_eam*65")
120 (define_reservation "gr5_fp_slotany" "(gr5_fp_slot0 | gr5_fp_slot1 | gr5_fp_slot2 | gr5_fp_slot3)")
122 (define_insn_reservation "gr5_fp_other" 1
123 (and (eq_attr "cpu" "gr5")
124 (eq_attr "type" "fp_reg,reg_fp,fcmp"))
127 (define_insn_reservation "gr5_fp_1cycle" 2
128 (and (eq_attr "cpu" "gr5")
129 (eq_attr "type" "fmove,ftoi"))
130 "gr5_issue + gr5_fp_slotany, gr5_fp_slot0")
132 (define_insn_reservation "gr5_fp_2cycle" 3
133 (and (eq_attr "cpu" "gr5")
134 (eq_attr "type" "itof"))
135 "gr5_issue + gr5_fp_slotany, gr5_fp_slot0*2")
137 (define_insn_reservation "gr5_fp_3cycle" 4
138 (and (eq_attr "cpu" "gr5")
139 (eq_attr "type" "fp"))
140 "gr5_issue + gr5_fp_slotany, gr5_fp_slot0*3")
142 (define_insn_reservation "gr5_fp_30cycle" 31
143 (and (eq_attr "cpu" "gr5")
144 (eq_attr "type" "fdiv,fsqrt"))
145 "gr5_issue + gr5_fp_slotany, gr5_fp_slot0*30")