1 ;; ARM Cortex-A9 pipeline description
2 ;; Copyright (C) 2008-2013 Free Software Foundation, Inc.
3 ;; Originally written by CodeSourcery for VFP.
5 ;; Rewritten by Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
6 ;; Integer Pipeline description contributed by ARM Ltd.
7 ;; VFP Pipeline description rewritten and contributed by ARM Ltd.
9 ;; This file is part of GCC.
11 ;; GCC is free software; you can redistribute it and/or modify it
12 ;; under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 3, or (at your option)
16 ;; GCC is distributed in the hope that it will be useful, but
17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 ;; General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GCC; see the file COPYING3. If not see
23 ;; <http://www.gnu.org/licenses/>.
25 (define_automaton "cortex_a9")
27 ;; The Cortex-A9 core is modelled as a dual issue pipeline that has
28 ;; the following components.
29 ;; 1. 1 Load Store Pipeline.
30 ;; 2. P0 / main pipeline for data processing instructions.
31 ;; 3. P1 / Dual pipeline for Data processing instructions.
32 ;; 4. MAC pipeline for multiply as well as multiply
33 ;; and accumulate instructions.
34 ;; 5. 1 VFP and an optional Neon unit.
35 ;; The Load/Store, VFP and Neon issue pipeline are multiplexed.
36 ;; The P0 / main pipeline and M1 stage of the MAC pipeline are
38 ;; The P1 / dual pipeline and M2 stage of the MAC pipeline are
40 ;; There are only 4 integer register read ports and hence at any point of
41 ;; time we can't have issue down the E1 and the E2 ports unless
42 ;; of course there are bypass paths that get exercised.
43 ;; Both P0 and P1 have 2 stages E1 and E2.
44 ;; Data processing instructions issue to E1 or E2 depending on
45 ;; whether they have an early shift or not.
47 (define_cpu_unit "ca9_issue_vfp_neon, cortex_a9_ls" "cortex_a9")
48 (define_cpu_unit "cortex_a9_p0_e1, cortex_a9_p0_e2" "cortex_a9")
49 (define_cpu_unit "cortex_a9_p1_e1, cortex_a9_p1_e2" "cortex_a9")
50 (define_cpu_unit "cortex_a9_p0_wb, cortex_a9_p1_wb" "cortex_a9")
51 (define_cpu_unit "cortex_a9_mac_m1, cortex_a9_mac_m2" "cortex_a9")
52 (define_cpu_unit "cortex_a9_branch, cortex_a9_issue_branch" "cortex_a9")
54 (define_reservation "cortex_a9_p0_default" "cortex_a9_p0_e2, cortex_a9_p0_wb")
55 (define_reservation "cortex_a9_p1_default" "cortex_a9_p1_e2, cortex_a9_p1_wb")
56 (define_reservation "cortex_a9_p0_shift" "cortex_a9_p0_e1, cortex_a9_p0_default")
57 (define_reservation "cortex_a9_p1_shift" "cortex_a9_p1_e1, cortex_a9_p1_default")
59 (define_reservation "cortex_a9_multcycle1"
60 "cortex_a9_p0_e2 + cortex_a9_mac_m1 + cortex_a9_mac_m2 + \
61 cortex_a9_p1_e2 + cortex_a9_p0_e1 + cortex_a9_p1_e1")
63 (define_reservation "cortex_a9_mult16"
64 "cortex_a9_mac_m1, cortex_a9_mac_m2, cortex_a9_p0_wb")
65 (define_reservation "cortex_a9_mac16"
66 "cortex_a9_multcycle1, cortex_a9_mac_m2, cortex_a9_p0_wb")
67 (define_reservation "cortex_a9_mult"
68 "cortex_a9_mac_m1*2, cortex_a9_mac_m2, cortex_a9_p0_wb")
69 (define_reservation "cortex_a9_mac"
70 "cortex_a9_multcycle1*2 ,cortex_a9_mac_m2, cortex_a9_p0_wb")
71 (define_reservation "cortex_a9_mult_long"
72 "cortex_a9_mac_m1*3, cortex_a9_mac_m2, cortex_a9_p0_wb")
74 ;; Issue at the same time along the load store pipeline and
75 ;; the VFP / Neon pipeline is not possible.
76 (exclusion_set "cortex_a9_ls" "ca9_issue_vfp_neon")
78 ;; Default data processing instruction without any shift
79 ;; The only exception to this is the mov instruction
80 ;; which can go down E2 without any problem.
81 (define_insn_reservation "cortex_a9_dp" 2
82 (and (eq_attr "tune" "cortexa9")
83 (eq_attr "type" "alu_imm,alus_imm,logic_imm,logics_imm,\
84 alu_reg,alus_reg,logic_reg,logics_reg,\
85 adc_imm,adcs_imm,adc_reg,adcs_reg,\
88 mov_imm,mov_reg,mvn_imm,mvn_reg,\
89 mov_shift_reg,mov_shift,\
90 mrs,multiple,no_insn"))
91 "cortex_a9_p0_default|cortex_a9_p1_default")
93 ;; An instruction using the shifter will go down E1.
94 (define_insn_reservation "cortex_a9_dp_shift" 3
95 (and (eq_attr "tune" "cortexa9")
96 (eq_attr "type" "alu_shift_imm,alus_shift_imm,\
97 logic_shift_imm,logics_shift_imm,\
98 alu_shift_reg,alus_shift_reg,\
99 logic_shift_reg,logics_shift_reg,\
100 extend,mvn_shift,mvn_shift_reg"))
101 "cortex_a9_p0_shift | cortex_a9_p1_shift")
103 ;; Loads have a latency of 4 cycles.
104 ;; We don't model autoincrement instructions. These
105 ;; instructions use the load store pipeline and 1 of
106 ;; the E2 units to write back the result of the increment.
108 (define_insn_reservation "cortex_a9_load1_2" 4
109 (and (eq_attr "tune" "cortexa9")
110 (eq_attr "type" "load1, load2, load_byte, f_loads, f_loadd"))
113 ;; Loads multiples and store multiples can't be issued for 2 cycles in a
114 ;; row. The description below assumes that addresses are 64 bit aligned.
115 ;; If not, there is an extra cycle latency which is not modelled.
117 (define_insn_reservation "cortex_a9_load3_4" 5
118 (and (eq_attr "tune" "cortexa9")
119 (eq_attr "type" "load3, load4"))
120 "cortex_a9_ls, cortex_a9_ls")
122 (define_insn_reservation "cortex_a9_store1_2" 0
123 (and (eq_attr "tune" "cortexa9")
124 (eq_attr "type" "store1, store2, f_stores, f_stored"))
127 ;; Almost all our store multiples use an auto-increment
128 ;; form. Don't issue back to back load and store multiples
129 ;; because the load store unit will stall.
131 (define_insn_reservation "cortex_a9_store3_4" 0
132 (and (eq_attr "tune" "cortexa9")
133 (eq_attr "type" "store3, store4"))
134 "cortex_a9_ls+(cortex_a9_p0_default | cortex_a9_p1_default), cortex_a9_ls")
136 ;; We get 16*16 multiply / mac results in 3 cycles.
137 (define_insn_reservation "cortex_a9_mult16" 3
138 (and (eq_attr "tune" "cortexa9")
139 (eq_attr "type" "smulxy"))
142 ;; The 16*16 mac is slightly different that it
143 ;; reserves M1 and M2 in the same cycle.
144 (define_insn_reservation "cortex_a9_mac16" 3
145 (and (eq_attr "tune" "cortexa9")
146 (eq_attr "type" "smlaxy"))
149 (define_insn_reservation "cortex_a9_multiply" 4
150 (and (eq_attr "tune" "cortexa9")
151 (eq_attr "type" "mul,smmul,smmulr"))
154 (define_insn_reservation "cortex_a9_mac" 4
155 (and (eq_attr "tune" "cortexa9")
156 (eq_attr "type" "mla,smmla"))
159 (define_insn_reservation "cortex_a9_multiply_long" 5
160 (and (eq_attr "tune" "cortexa9")
161 (eq_attr "type" "smull,umull,smulls,umulls,smlal,smlals,umlal,umlals"))
162 "cortex_a9_mult_long")
164 ;; An instruction with a result in E2 can be forwarded
165 ;; to E2 or E1 or M1 or the load store unit in the next cycle.
167 (define_bypass 1 "cortex_a9_dp"
168 "cortex_a9_dp_shift, cortex_a9_multiply,
169 cortex_a9_load1_2, cortex_a9_dp, cortex_a9_store1_2,
170 cortex_a9_mult16, cortex_a9_mac16, cortex_a9_mac, cortex_a9_store3_4, cortex_a9_load3_4,
171 cortex_a9_multiply_long")
173 (define_bypass 2 "cortex_a9_dp_shift"
174 "cortex_a9_dp_shift, cortex_a9_multiply,
175 cortex_a9_load1_2, cortex_a9_dp, cortex_a9_store1_2,
176 cortex_a9_mult16, cortex_a9_mac16, cortex_a9_mac, cortex_a9_store3_4, cortex_a9_load3_4,
177 cortex_a9_multiply_long")
179 ;; An instruction in the load store pipeline can provide
180 ;; read access to a DP instruction in the P0 default pipeline
181 ;; before the writeback stage.
183 (define_bypass 3 "cortex_a9_load1_2" "cortex_a9_dp, cortex_a9_load1_2,
184 cortex_a9_store3_4, cortex_a9_store1_2")
186 (define_bypass 4 "cortex_a9_load3_4" "cortex_a9_dp, cortex_a9_load1_2,
187 cortex_a9_store3_4, cortex_a9_store1_2, cortex_a9_load3_4")
189 ;; Calls and branches.
191 ;; Branch instructions
193 (define_insn_reservation "cortex_a9_branch" 0
194 (and (eq_attr "tune" "cortexa9")
195 (eq_attr "type" "branch"))
198 ;; Call latencies are essentially 0 but make sure
199 ;; dual issue doesn't happen i.e the next instruction
200 ;; starts at the next cycle.
201 (define_insn_reservation "cortex_a9_call" 0
202 (and (eq_attr "tune" "cortexa9")
203 (eq_attr "type" "call"))
204 "cortex_a9_issue_branch + cortex_a9_multcycle1 + cortex_a9_ls + ca9_issue_vfp_neon")
207 ;; Pipelining for VFP instructions.
208 ;; Issue happens either along load store unit or the VFP / Neon unit.
209 ;; Pipeline Instruction Classification.
210 ;; FPS - fmov, ffariths, ffarithd,f_mcr,f_mcrr,f_mrc,f_mrrc
211 ;; FP_ADD - fadds, faddd, fcmps (1)
212 ;; FPMUL - fmul{s,d}, fmac{s,d}, ffma{s,d}
214 (define_cpu_unit "ca9fps" "cortex_a9")
215 (define_cpu_unit "ca9fp_add1, ca9fp_add2, ca9fp_add3, ca9fp_add4" "cortex_a9")
216 (define_cpu_unit "ca9fp_mul1, ca9fp_mul2 , ca9fp_mul3, ca9fp_mul4" "cortex_a9")
217 (define_cpu_unit "ca9fp_ds1" "cortex_a9")
220 ;; fmrs, fmrrd, fmstat and fmrx - The data is available after 1 cycle.
221 (define_insn_reservation "cortex_a9_fps" 2
222 (and (eq_attr "tune" "cortexa9")
223 (eq_attr "type" "fmov, fconsts, fconstd, ffariths, ffarithd,\
224 f_mcr, f_mcrr, f_mrc, f_mrrc, f_flag"))
225 "ca9_issue_vfp_neon + ca9fps")
229 "cortex_a9_fadd, cortex_a9_fps, cortex_a9_fcmp, cortex_a9_dp, cortex_a9_dp_shift, cortex_a9_multiply, cortex_a9_multiply_long")
231 ;; Scheduling on the FP_ADD pipeline.
232 (define_reservation "ca9fp_add" "ca9_issue_vfp_neon + ca9fp_add1, ca9fp_add2, ca9fp_add3, ca9fp_add4")
234 (define_insn_reservation "cortex_a9_fadd" 4
235 (and (eq_attr "tune" "cortexa9")
236 (eq_attr "type" "fadds, faddd, f_cvt, f_cvtf2i, f_cvti2f"))
239 (define_insn_reservation "cortex_a9_fcmp" 1
240 (and (eq_attr "tune" "cortexa9")
241 (eq_attr "type" "fcmps, fcmpd"))
242 "ca9_issue_vfp_neon + ca9fp_add1")
244 ;; Scheduling for the Multiply and MAC instructions.
245 (define_reservation "ca9fmuls"
246 "ca9fp_mul1 + ca9_issue_vfp_neon, ca9fp_mul2, ca9fp_mul3, ca9fp_mul4")
248 (define_reservation "ca9fmuld"
249 "ca9fp_mul1 + ca9_issue_vfp_neon, (ca9fp_mul1 + ca9fp_mul2), ca9fp_mul2, ca9fp_mul3, ca9fp_mul4")
251 (define_insn_reservation "cortex_a9_fmuls" 4
252 (and (eq_attr "tune" "cortexa9")
253 (eq_attr "type" "fmuls"))
256 (define_insn_reservation "cortex_a9_fmuld" 5
257 (and (eq_attr "tune" "cortexa9")
258 (eq_attr "type" "fmuld"))
261 (define_insn_reservation "cortex_a9_fmacs" 8
262 (and (eq_attr "tune" "cortexa9")
263 (eq_attr "type" "fmacs,ffmas"))
264 "ca9fmuls, ca9fp_add")
266 (define_insn_reservation "cortex_a9_fmacd" 9
267 (and (eq_attr "tune" "cortexa9")
268 (eq_attr "type" "fmacd,ffmad"))
269 "ca9fmuld, ca9fp_add")
271 ;; Division pipeline description.
272 (define_insn_reservation "cortex_a9_fdivs" 15
273 (and (eq_attr "tune" "cortexa9")
274 (eq_attr "type" "fdivs, fsqrts"))
275 "ca9fp_ds1 + ca9_issue_vfp_neon, nothing*14")
277 (define_insn_reservation "cortex_a9_fdivd" 25
278 (and (eq_attr "tune" "cortexa9")
279 (eq_attr "type" "fdivd, fsqrtd"))
280 "ca9fp_ds1 + ca9_issue_vfp_neon, nothing*24")
282 ;; Include Neon pipeline description
283 (include "cortex-a9-neon.md")