1 ;; ARM Cortex-A53 pipeline description
2 ;; Copyright (C) 2013-2014 Free Software Foundation, Inc.
4 ;; Contributed by ARM Ltd.
6 ;; This file is part of GCC.
8 ;; GCC is free software; you can redistribute it and/or modify it
9 ;; under the terms of the GNU General Public License as published by
10 ;; the Free Software Foundation; either version 3, or (at your option)
13 ;; GCC is distributed in the hope that it will be useful, but
14 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 ;; General Public License for more details.
18 ;; You should have received a copy of the GNU General Public License
19 ;; along with GCC; see the file COPYING3. If not see
20 ;; <http://www.gnu.org/licenses/>.
22 (define_automaton "cortex_a53")
24 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
26 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
28 ;; There are two main integer execution pipelines, described as
29 ;; slot 0 and issue slot 1.
31 (define_cpu_unit "cortex_a53_slot0" "cortex_a53")
32 (define_cpu_unit "cortex_a53_slot1" "cortex_a53")
34 (define_reservation "cortex_a53_slot_any" "cortex_a53_slot0|cortex_a53_slot1")
35 (define_reservation "cortex_a53_single_issue" "cortex_a53_slot0+cortex_a53_slot1")
37 ;; The load/store pipeline. Load/store instructions can dual-issue from
38 ;; either pipeline, but two load/stores cannot simultaneously issue.
40 (define_cpu_unit "cortex_a53_ls" "cortex_a53")
42 ;; The store pipeline. Shared between both execution pipelines.
44 (define_cpu_unit "cortex_a53_store" "cortex_a53")
46 ;; The branch pipeline. Branches can dual-issue with other instructions
47 ;; (except when those instructions take multiple cycles to issue).
49 (define_cpu_unit "cortex_a53_branch" "cortex_a53")
51 ;; The integer divider.
53 (define_cpu_unit "cortex_a53_idiv" "cortex_a53")
55 ;; The floating-point add pipeline used to model the usage
56 ;; of the add pipeline by fmac instructions.
58 (define_cpu_unit "cortex_a53_fpadd_pipe" "cortex_a53")
60 ;; Floating-point div/sqrt (long latency, out-of-order completion).
62 (define_cpu_unit "cortex_a53_fp_div_sqrt" "cortex_a53")
64 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
66 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
68 (define_insn_reservation "cortex_a53_alu" 2
69 (and (eq_attr "tune" "cortexa53")
70 (eq_attr "type" "alu_imm,alus_imm,logic_imm,logics_imm,\
71 alu_reg,alus_reg,logic_reg,logics_reg,\
72 adc_imm,adcs_imm,adc_reg,adcs_reg,\
75 mov_imm,mov_reg,mvn_imm,mvn_reg,\
76 mrs,multiple,no_insn"))
77 "cortex_a53_slot_any")
79 (define_insn_reservation "cortex_a53_alu_shift" 2
80 (and (eq_attr "tune" "cortexa53")
81 (eq_attr "type" "alu_shift_imm,alus_shift_imm,\
82 logic_shift_imm,logics_shift_imm,\
83 alu_shift_reg,alus_shift_reg,\
84 logic_shift_reg,logics_shift_reg,\
85 extend,mov_shift,mov_shift_reg,\
86 mvn_shift,mvn_shift_reg"))
87 "cortex_a53_slot_any")
89 ;; Forwarding path for unshifted operands.
91 (define_bypass 1 "cortex_a53_alu,cortex_a53_alu_shift"
94 (define_bypass 1 "cortex_a53_alu,cortex_a53_alu_shift"
95 "cortex_a53_alu_shift"
96 "arm_no_early_alu_shift_dep")
98 ;; The multiplier pipeline can forward results so there's no need to specify
99 ;; bypasses. Multiplies can only single-issue currently.
101 (define_insn_reservation "cortex_a53_mul" 3
102 (and (eq_attr "tune" "cortexa53")
103 (ior (eq_attr "mul32" "yes")
104 (eq_attr "mul64" "yes")))
105 "cortex_a53_single_issue")
107 ;; A multiply with a single-register result or an MLA, followed by an
108 ;; MLA with an accumulator dependency, has its result forwarded so two
109 ;; such instructions can issue back-to-back.
111 (define_bypass 1 "cortex_a53_mul"
113 "arm_mac_accumulator_is_mul_result")
115 ;; Punt with a high enough latency for divides.
116 (define_insn_reservation "cortex_a53_udiv" 8
117 (and (eq_attr "tune" "cortexa53")
118 (eq_attr "type" "udiv"))
119 "(cortex_a53_slot0+cortex_a53_idiv),cortex_a53_idiv*7")
121 (define_insn_reservation "cortex_a53_sdiv" 9
122 (and (eq_attr "tune" "cortexa53")
123 (eq_attr "type" "sdiv"))
124 "(cortex_a53_slot0+cortex_a53_idiv),cortex_a53_idiv*8")
127 (define_bypass 2 "cortex_a53_mul,cortex_a53_udiv,cortex_a53_sdiv"
129 (define_bypass 2 "cortex_a53_mul,cortex_a53_udiv,cortex_a53_sdiv"
130 "cortex_a53_alu_shift"
131 "arm_no_early_alu_shift_dep")
133 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
134 ;; Load/store instructions.
135 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
137 ;; Address-generation happens in the issue stage.
139 (define_insn_reservation "cortex_a53_load1" 3
140 (and (eq_attr "tune" "cortexa53")
141 (eq_attr "type" "load_byte,load1,load_acq"))
142 "cortex_a53_slot_any+cortex_a53_ls")
144 (define_insn_reservation "cortex_a53_store1" 2
145 (and (eq_attr "tune" "cortexa53")
146 (eq_attr "type" "store1,store_rel"))
147 "cortex_a53_slot_any+cortex_a53_ls+cortex_a53_store")
149 (define_insn_reservation "cortex_a53_load2" 3
150 (and (eq_attr "tune" "cortexa53")
151 (eq_attr "type" "load2"))
152 "cortex_a53_single_issue+cortex_a53_ls")
154 (define_insn_reservation "cortex_a53_store2" 2
155 (and (eq_attr "tune" "cortexa53")
156 (eq_attr "type" "store2"))
157 "cortex_a53_single_issue+cortex_a53_ls+cortex_a53_store")
159 (define_insn_reservation "cortex_a53_load3plus" 4
160 (and (eq_attr "tune" "cortexa53")
161 (eq_attr "type" "load3,load4"))
162 "(cortex_a53_single_issue+cortex_a53_ls)*2")
164 (define_insn_reservation "cortex_a53_store3plus" 3
165 (and (eq_attr "tune" "cortexa53")
166 (eq_attr "type" "store3,store4"))
167 "(cortex_a53_single_issue+cortex_a53_ls+cortex_a53_store)*2")
169 ;; Load/store addresses are required early in Issue.
170 (define_bypass 3 "cortex_a53_load1,cortex_a53_load2,cortex_a53_load3plus,cortex_a53_alu,cortex_a53_alu_shift"
172 "arm_early_load_addr_dep")
173 (define_bypass 3 "cortex_a53_load1,cortex_a53_load2,cortex_a53_load3plus,cortex_a53_alu,cortex_a53_alu_shift"
175 "arm_early_store_addr_dep")
177 ;; Load data can forward in the ALU pipeline
178 (define_bypass 2 "cortex_a53_load1,cortex_a53_load2"
180 (define_bypass 2 "cortex_a53_load1,cortex_a53_load2"
181 "cortex_a53_alu_shift"
182 "arm_no_early_alu_shift_dep")
184 ;; ALU ops can forward to stores.
185 (define_bypass 0 "cortex_a53_alu,cortex_a53_alu_shift"
186 "cortex_a53_store1,cortex_a53_store2,cortex_a53_store3plus"
187 "arm_no_early_store_addr_dep")
189 (define_bypass 1 "cortex_a53_mul,cortex_a53_udiv,cortex_a53_sdiv,cortex_a53_load1,cortex_a53_load2,cortex_a53_load3plus"
190 "cortex_a53_store1,cortex_a53_store2,cortex_a53_store3plus"
191 "arm_no_early_store_addr_dep")
193 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
195 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
197 ;; Currently models all branches as dual-issuable from either execution
198 ;; slot, which isn't true for all cases. We still need to model indirect
201 (define_insn_reservation "cortex_a53_branch" 0
202 (and (eq_attr "tune" "cortexa53")
203 (eq_attr "type" "branch,call"))
204 "cortex_a53_slot_any+cortex_a53_branch")
206 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
207 ;; Floating-point arithmetic.
208 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
210 (define_insn_reservation "cortex_a53_fpalu" 4
211 (and (eq_attr "tune" "cortexa53")
212 (eq_attr "type" "ffariths, fadds, ffarithd, faddd, fmov, fmuls,\
213 f_cvt,f_cvtf2i,f_cvti2f,\
214 fcmps, fcmpd, fcsel"))
215 "cortex_a53_slot0+cortex_a53_fpadd_pipe")
217 (define_insn_reservation "cortex_a53_fconst" 2
218 (and (eq_attr "tune" "cortexa53")
219 (eq_attr "type" "fconsts,fconstd"))
220 "cortex_a53_slot0+cortex_a53_fpadd_pipe")
222 (define_insn_reservation "cortex_a53_fpmul" 4
223 (and (eq_attr "tune" "cortexa53")
224 (eq_attr "type" "fmuls,fmuld"))
227 ;; For single-precision multiply-accumulate, the add (accumulate) is issued after
228 ;; the multiply completes. Model that accordingly.
230 (define_insn_reservation "cortex_a53_fpmac" 8
231 (and (eq_attr "tune" "cortexa53")
232 (eq_attr "type" "fmacs,fmacd,ffmas,ffmad"))
233 "cortex_a53_slot0, nothing*3, cortex_a53_fpadd_pipe")
235 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
236 ;; Floating-point divide/square root instructions.
237 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
238 ;; fsqrt really takes one cycle less, but that is not modelled.
240 (define_insn_reservation "cortex_a53_fdivs" 14
241 (and (eq_attr "tune" "cortexa53")
242 (eq_attr "type" "fdivs, fsqrts"))
243 "cortex_a53_slot0, cortex_a53_fp_div_sqrt * 13")
245 (define_insn_reservation "cortex_a53_fdivd" 29
246 (and (eq_attr "tune" "cortexa53")
247 (eq_attr "type" "fdivd, fsqrtd"))
248 "cortex_a53_slot0, cortex_a53_fp_div_sqrt * 28")
250 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
251 ;; VFP to/from core transfers.
252 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
254 (define_insn_reservation "cortex_a53_r2f" 4
255 (and (eq_attr "tune" "cortexa53")
256 (eq_attr "type" "f_mcr,f_mcrr"))
259 (define_insn_reservation "cortex_a53_f2r" 2
260 (and (eq_attr "tune" "cortexa53")
261 (eq_attr "type" "f_mrc,f_mrrc"))
264 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
265 ;; VFP flag transfer.
266 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
268 (define_insn_reservation "cortex_a53_f_flags" 4
269 (and (eq_attr "tune" "cortexa53")
270 (eq_attr "type" "f_flag"))
273 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
275 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
277 (define_insn_reservation "cortex_a53_f_loads" 4
278 (and (eq_attr "tune" "cortexa53")
279 (eq_attr "type" "f_loads"))
282 (define_insn_reservation "cortex_a53_f_loadd" 5
283 (and (eq_attr "tune" "cortexa53")
284 (eq_attr "type" "f_loadd"))
287 (define_insn_reservation "cortex_a53_f_stores" 0
288 (and (eq_attr "tune" "cortexa53")
289 (eq_attr "type" "f_stores"))
292 (define_insn_reservation "cortex_a53_f_stored" 0
293 (and (eq_attr "tune" "cortexa53")
294 (eq_attr "type" "f_stored"))
297 ;; Load-to-use for floating-point values has a penalty of one cycle,
298 ;; i.e. a latency of two.
300 (define_bypass 2 "cortex_a53_f_loads"
301 "cortex_a53_fpalu, cortex_a53_fpmac, cortex_a53_fpmul,\
302 cortex_a53_fdivs, cortex_a53_fdivd,\
305 (define_bypass 2 "cortex_a53_f_loadd"
306 "cortex_a53_fpalu, cortex_a53_fpmac, cortex_a53_fpmul,\
307 cortex_a53_fdivs, cortex_a53_fdivd,\