1 ;; Pipeline description for the AppliedMicro Titan core.
2 ;; Copyright (C) 2010-2018 Free Software Foundation, Inc.
3 ;; Contributed by Theobroma Systems Design und Consulting GmbH
5 ;; This file is part of GCC.
7 ;; GCC is free software; you can redistribute it and/or modify it
8 ;; under the terms of the GNU General Public License as published
9 ;; by the Free Software Foundation; either version 3, or (at your
10 ;; option) any later version.
12 ;; GCC is distributed in the hope that it will be useful, but WITHOUT
13 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 ;; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 ;; License for more details.
17 ;; You should have received a copy of the GNU General Public License
18 ;; along with GCC; see the file COPYING3. If not see
19 ;; <http://www.gnu.org/licenses/>.
21 ;; AppliedMicro Titan core complex
23 (define_automaton "titan_core,titan_fpu,titan_fxu,titan_bpu,titan_lsu")
24 (define_cpu_unit "titan_issue_0,titan_issue_1" "titan_core")
26 ;; Some useful abbreviations.
27 (define_reservation "titan_issue" "titan_issue_0|titan_issue_1")
29 ;; === FXU scheduling ===
31 (define_cpu_unit "titan_fxu_sh,titan_fxu_wb" "titan_fxu")
33 ;; The 1-cycle adder executes add, addi, subf, neg, compare and trap
34 ;; instructions. It provides its own, dedicated result-bus, so we
35 ;; don't need the titan_fxu_wb reservation to complete.
36 (define_insn_reservation "titan_fxu_adder" 1
37 (and (ior (eq_attr "type" "cmp,trap")
38 (and (eq_attr "type" "add,logical")
39 (eq_attr "dot" "yes")))
40 (eq_attr "cpu" "titan"))
41 "titan_issue,titan_fxu_sh")
43 (define_insn_reservation "titan_imul" 5
44 (and (eq_attr "type" "mul")
45 (eq_attr "cpu" "titan"))
46 "titan_issue,titan_fxu_sh,nothing*5,titan_fxu_wb")
48 (define_insn_reservation "titan_mulhw" 4
49 (and (eq_attr "type" "halfmul")
50 (eq_attr "cpu" "titan"))
51 "titan_issue,titan_fxu_sh,nothing*4,titan_fxu_wb")
53 (define_bypass 2 "titan_mulhw" "titan_mulhw")
55 (define_insn_reservation "titan_fxu_shift_and_rotate" 2
56 (and (eq_attr "type" "insert,shift,cntlz")
57 (eq_attr "cpu" "titan"))
58 "titan_issue,titan_fxu_sh,nothing*2,titan_fxu_wb")
60 ;; We model the divider for the worst-case (i.e. a full 32-bit
61 ;; divide). To model the bypass for byte-wise completion, a
62 ;; define_bypass with a guard-function could be used... however, this
63 ;; would be an optimization of doubtful value, as a large number of
64 ;; divides will operate on 32-bit variables.
66 ;; To avoid an unmanagably large automata (generating the automata
67 ;; would require well over 2GB in memory), we don't model the shared
68 ;; result bus on this one. The divider-pipeline is thus modeled
69 ;; through its latency and initial disptach bottlenecks (i.e. issue
70 ;; slots and fxu scheduler availability)
71 (define_insn_reservation "titan_fxu_div" 34
72 (and (eq_attr "type" "div")
73 (eq_attr "cpu" "titan"))
74 "titan_issue,titan_fxu_sh")
76 (define_insn_reservation "titan_fxu_alu" 1
77 (and (ior (eq_attr "type" "integer,exts")
78 (and (eq_attr "type" "add,logical")
79 (eq_attr "dot" "no")))
80 (eq_attr "cpu" "titan"))
81 "titan_issue,titan_fxu_sh,nothing,titan_fxu_wb")
83 ;; === BPU scheduling ===
85 (define_cpu_unit "titan_bpu_sh" "titan_bpu")
87 (define_insn_reservation "titan_bpu" 2
88 (and (eq_attr "type" "branch,jmpreg,cr_logical")
89 (eq_attr "cpu" "titan"))
90 "titan_issue,titan_bpu_sh")
92 ;; === LSU scheduling ===
94 (define_cpu_unit "titan_lsu_sh" "titan_lsu")
97 (define_insn_reservation "titan_lsu_load" 3
98 (and (eq_attr "type" "load,load_l,sync")
99 (eq_attr "cpu" "titan"))
100 "titan_issue,titan_lsu_sh")
102 (define_insn_reservation "titan_lsu_fpload" 12
103 (and (eq_attr "type" "fpload")
104 (eq_attr "cpu" "titan"))
105 "titan_issue,titan_lsu_sh")
107 ;; Note that the isync is not clearly placed within any execution
108 ;; unit. We've made the assumption that it will be running out of the
109 ;; LSU, as msync is also executed within the LSU.
110 (define_insn_reservation "titan_lsu_sync" 20
111 (and (eq_attr "type" "sync")
112 (eq_attr "cpu" "titan"))
113 "titan_issue,titan_lsu_sh*20")
116 (define_insn_reservation "titan_lsu_store" 12
117 (and (eq_attr "type" "store,store_c")
118 (eq_attr "cpu" "titan"))
119 "titan_issue,titan_lsu_sh")
121 (define_insn_reservation "titan_lsu_fpstore" 12
122 (and (eq_attr "type" "fpstore")
123 (eq_attr "cpu" "titan"))
124 "titan_issue,titan_lsu_sh")
126 ;; === FPU scheduling ===
128 ;; In order to keep the automaton for the Titan FPU efficient and
129 ;; maintainable, we've kept in as concise as possible and created a
130 ;; mapping for the main "choke points" only instead of modelling the
131 ;; overall flow of instructions through the FP-pipeline(s).
133 ;; The key elements modelled are:
134 ;; * each FP-instruction takes up one of the two issue slots
135 ;; * the FPU runs at half the core frequency
136 ;; * divides are not pipelined (but execute in a separate unit)
137 ;; * the FPU has a shared result bus for all its units
139 (define_cpu_unit "titan_fp0,titan_fpdiv,titan_fpwb" "titan_fpu")
141 (define_insn_reservation "titan_fp_div_double" 72
142 (and (eq_attr "type" "ddiv")
143 (eq_attr "cpu" "titan"))
144 "titan_issue,titan_fpdiv*72,titan_fpwb")
146 (define_insn_reservation "titan_fp_div_single" 46
147 (and (eq_attr "type" "sdiv")
148 (eq_attr "cpu" "titan"))
149 "titan_issue,titan_fpdiv*46,titan_fpwb")
151 (define_insn_reservation "titan_fp_single" 12
152 (and (eq_attr "fp_type" "fp_addsub_s,fp_mul_s,fp_maddsub_s")
153 (eq_attr "cpu" "titan"))
154 "titan_issue,titan_fp0*2,nothing*10,titan_fpwb")
156 ;; Make sure the "titan_fp" rule stays last, as it's a catch all for
157 ;; double-precision and unclassified (e.g. fsel) FP-instructions
158 (define_insn_reservation "titan_fp" 10
159 (and (eq_attr "type" "fpcompare,fp,fpsimple,dmul")
160 (eq_attr "cpu" "titan"))
161 "titan_issue,titan_fp0*2,nothing*8,titan_fpwb")
163 ;; Please note, that the non-pipelined FP-instructions "mcrfs",
164 ;; "mtfsb0[.]", "mtfsb1[.]", "mtfsf[.]", "mtfsfi[.]" are not
165 ;; accessible from regular language constructs (i.e. they are not used
166 ;; by the code generator, except for special purpose sequences defined
167 ;; in rs6000.md), no special provisions are made for these.