0
|
1 ;; AMD K6/K6-2 Scheduling
|
|
2 ;; Copyright (C) 2002, 2004, 2007
|
|
3 ;; Free Software Foundation, Inc.
|
|
4 ;;
|
|
5 ;; This file is part of GCC.
|
|
6 ;;
|
|
7 ;; GCC is free software; you can redistribute it and/or modify
|
|
8 ;; it under the terms of the GNU General Public License as published by
|
|
9 ;; the Free Software Foundation; either version 3, or (at your option)
|
|
10 ;; any later version.
|
|
11 ;;
|
|
12 ;; GCC is distributed in the hope that it will be useful,
|
|
13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
15 ;; GNU General Public License for more details.
|
|
16 ;;
|
|
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/>.
|
|
20 ;;
|
|
21 ;; The K6 architecture is quite similar to PPro. Important difference is
|
|
22 ;; that there are only two decoders and they seems to be much slower than
|
|
23 ;; any of the execution units. So we have to pay much more attention to
|
|
24 ;; proper scheduling for the decoders.
|
|
25 ;; FIXME: We don't do that right now. A good start would be to sort the
|
|
26 ;; instructions based on length.
|
|
27 ;;
|
|
28 ;; This description is based on data from the following documents:
|
|
29 ;;
|
|
30 ;; "AMD-K6 Processor Data Sheet (Preliminary information)"
|
|
31 ;; Advanced Micro Devices, Inc., 1998.
|
|
32 ;;
|
|
33 ;; "AMD-K6 Processor Code Optimization Application Note"
|
|
34 ;; Advanced Micro Devices, Inc., 2000.
|
|
35 ;;
|
|
36 ;; CPU execution units of the K6:
|
|
37 ;;
|
|
38 ;; store describes the Store unit. This unit is not modelled
|
|
39 ;; completely and it is only used to model lea operation.
|
|
40 ;; Otherwise it lies outside of any critical path.
|
|
41 ;; load describes the Load unit
|
|
42 ;; alux describes the Integer X unit
|
|
43 ;; mm describes the Multimedia unit, which shares a pipe
|
|
44 ;; with the Integer X unit. This unit is used for MMX,
|
|
45 ;; which is not implemented for K6.
|
|
46 ;; aluy describes the Integer Y unit
|
|
47 ;; fpu describes the FPU unit
|
|
48 ;; branch describes the Branch unit
|
|
49 ;;
|
|
50 ;; The fp unit is not pipelined, and it can only do one operation per two
|
|
51 ;; cycles, including fxcg.
|
|
52 ;;
|
|
53 ;; Generally this is a very poor description, but at least no worse than
|
|
54 ;; the old description, and a lot easier to extend to something more
|
|
55 ;; reasonable if anyone still cares enough about this architecture in 2004.
|
|
56 ;;
|
|
57 ;; ??? fxch isn't handled; not an issue until sched3 after reg-stack is real.
|
|
58
|
|
59 (define_automaton "k6_decoder,k6_load_unit,k6_store_unit,k6_integer_units,k6_fpu_unit,k6_branch_unit")
|
|
60
|
|
61 ;; The K6 instruction decoding begins before the on-chip instruction cache is
|
|
62 ;; filled. Depending on the length of the instruction, two simple instructions
|
|
63 ;; can be decoded in two parallel short decoders, or one complex instruction can
|
|
64 ;; be decoded in either the long or the vector decoder. For all practical
|
|
65 ;; purposes, the long and vector decoder can be modelled as one decoder.
|
|
66 (define_cpu_unit "k6_decode_short0" "k6_decoder")
|
|
67 (define_cpu_unit "k6_decode_short1" "k6_decoder")
|
|
68 (define_cpu_unit "k6_decode_long" "k6_decoder")
|
|
69 (exclusion_set "k6_decode_long" "k6_decode_short0,k6_decode_short1")
|
|
70 (define_reservation "k6_decode_short" "k6_decode_short0|k6_decode_short1")
|
|
71 (define_reservation "k6_decode_vector" "k6_decode_long")
|
|
72
|
|
73 (define_cpu_unit "k6_store" "k6_store_unit")
|
|
74 (define_cpu_unit "k6_load" "k6_load_unit")
|
|
75 (define_cpu_unit "k6_alux,k6_aluy" "k6_integer_units")
|
|
76 (define_cpu_unit "k6_fpu" "k6_fpu_unit")
|
|
77 (define_cpu_unit "k6_branch" "k6_branch_unit")
|
|
78
|
|
79 ;; Shift instructions and certain arithmetic are issued only on Integer X.
|
|
80 (define_insn_reservation "k6_alux_only" 1
|
|
81 (and (eq_attr "cpu" "k6")
|
|
82 (and (eq_attr "type" "ishift,ishift1,rotate,rotate1,alu1,negnot")
|
|
83 (eq_attr "memory" "none")))
|
|
84 "k6_decode_short,k6_alux")
|
|
85
|
|
86 (define_insn_reservation "k6_alux_only_load" 3
|
|
87 (and (eq_attr "cpu" "k6")
|
|
88 (and (eq_attr "type" "ishift,ishift1,rotate,rotate1,alu1,negnot")
|
|
89 (eq_attr "memory" "load")))
|
|
90 "k6_decode_short,k6_load,k6_alux")
|
|
91
|
|
92 (define_insn_reservation "k6_alux_only_store" 3
|
|
93 (and (eq_attr "cpu" "k6")
|
|
94 (and (eq_attr "type" "ishift,ishift1,rotate,rotate1,alu1,negnot")
|
|
95 (eq_attr "memory" "store,both,unknown")))
|
|
96 "k6_decode_long,k6_load,k6_alux,k6_store")
|
|
97
|
|
98 ;; Integer divide and multiply can only be issued on Integer X, too.
|
|
99 (define_insn_reservation "k6_alu_imul" 2
|
|
100 (and (eq_attr "cpu" "k6")
|
|
101 (eq_attr "type" "imul"))
|
|
102 "k6_decode_vector,k6_alux*3")
|
|
103
|
|
104 (define_insn_reservation "k6_alu_imul_load" 4
|
|
105 (and (eq_attr "cpu" "k6")
|
|
106 (and (eq_attr "type" "imul")
|
|
107 (eq_attr "memory" "load")))
|
|
108 "k6_decode_vector,k6_load,k6_alux*3")
|
|
109
|
|
110 (define_insn_reservation "k6_alu_imul_store" 4
|
|
111 (and (eq_attr "cpu" "k6")
|
|
112 (and (eq_attr "type" "imul")
|
|
113 (eq_attr "memory" "store,both,unknown")))
|
|
114 "k6_decode_vector,k6_load,k6_alux*3,k6_store")
|
|
115
|
|
116 ;; ??? Guessed latencies based on the old pipeline description.
|
|
117 (define_insn_reservation "k6_alu_idiv" 17
|
|
118 (and (eq_attr "cpu" "k6")
|
|
119 (and (eq_attr "type" "idiv")
|
|
120 (eq_attr "memory" "none")))
|
|
121 "k6_decode_vector,k6_alux*17")
|
|
122
|
|
123 (define_insn_reservation "k6_alu_idiv_mem" 19
|
|
124 (and (eq_attr "cpu" "k6")
|
|
125 (and (eq_attr "type" "idiv")
|
|
126 (eq_attr "memory" "!none")))
|
|
127 "k6_decode_vector,k6_load,k6_alux*17")
|
|
128
|
|
129 ;; Basic word and doubleword ALU ops can be issued on both Integer units.
|
|
130 (define_insn_reservation "k6_alu" 1
|
|
131 (and (eq_attr "cpu" "k6")
|
|
132 (and (eq_attr "type" "alu,alu1,negnot,icmp,test,imovx,incdec,setcc")
|
|
133 (eq_attr "memory" "none")))
|
|
134 "k6_decode_short,k6_alux|k6_aluy")
|
|
135
|
|
136 (define_insn_reservation "k6_alu_load" 3
|
|
137 (and (eq_attr "cpu" "k6")
|
|
138 (and (eq_attr "type" "alu,alu1,negnot,icmp,test,imovx,incdec,setcc")
|
|
139 (eq_attr "memory" "load")))
|
|
140 "k6_decode_short,k6_load,k6_alux|k6_aluy")
|
|
141
|
|
142 (define_insn_reservation "k6_alu_store" 3
|
|
143 (and (eq_attr "cpu" "k6")
|
|
144 (and (eq_attr "type" "alu,alu1,negnot,icmp,test,imovx,incdec,setcc")
|
|
145 (eq_attr "memory" "store,both,unknown")))
|
|
146 "k6_decode_long,k6_load,k6_alux|k6_aluy,k6_store")
|
|
147
|
|
148 ;; A "load immediate" operation does not require execution at all,
|
|
149 ;; it is available immediately after decoding. Special-case this.
|
|
150 (define_insn_reservation "k6_alu_imov" 1
|
|
151 (and (eq_attr "cpu" "k6")
|
|
152 (and (eq_attr "type" "imov")
|
|
153 (and (eq_attr "memory" "none")
|
|
154 (match_operand 1 "nonimmediate_operand"))))
|
|
155 "k6_decode_short,k6_alux|k6_aluy")
|
|
156
|
|
157 (define_insn_reservation "k6_alu_imov_imm" 0
|
|
158 (and (eq_attr "cpu" "k6")
|
|
159 (and (eq_attr "type" "imov")
|
|
160 (and (eq_attr "memory" "none")
|
|
161 (match_operand 1 "immediate_operand"))))
|
|
162 "k6_decode_short")
|
|
163
|
|
164 (define_insn_reservation "k6_alu_imov_load" 2
|
|
165 (and (eq_attr "cpu" "k6")
|
|
166 (and (eq_attr "type" "imov")
|
|
167 (eq_attr "memory" "load")))
|
|
168 "k6_decode_short,k6_load")
|
|
169
|
|
170 (define_insn_reservation "k6_alu_imov_store" 1
|
|
171 (and (eq_attr "cpu" "k6")
|
|
172 (and (eq_attr "type" "imov")
|
|
173 (eq_attr "memory" "store")))
|
|
174 "k6_decode_short,k6_store")
|
|
175
|
|
176 (define_insn_reservation "k6_alu_imov_both" 2
|
|
177 (and (eq_attr "cpu" "k6")
|
|
178 (and (eq_attr "type" "imov")
|
|
179 (eq_attr "memory" "both,unknown")))
|
|
180 "k6_decode_long,k6_load,k6_alux|k6_aluy")
|
|
181
|
|
182 ;; The branch unit.
|
|
183 (define_insn_reservation "k6_branch_call" 1
|
|
184 (and (eq_attr "cpu" "k6")
|
|
185 (eq_attr "type" "call,callv"))
|
|
186 "k6_decode_vector,k6_branch")
|
|
187
|
|
188 (define_insn_reservation "k6_branch_branch" 1
|
|
189 (and (eq_attr "cpu" "k6")
|
|
190 (eq_attr "type" "ibr"))
|
|
191 "k6_decode_short,k6_branch")
|
|
192
|
|
193 ;; The load and units have two pipeline stages. The load latency is
|
|
194 ;; two cycles.
|
|
195 (define_insn_reservation "k6_load_pop" 3
|
|
196 (and (eq_attr "cpu" "k6")
|
|
197 (ior (eq_attr "type" "pop")
|
|
198 (eq_attr "memory" "load,both")))
|
|
199 "k6_decode_short,k6_load")
|
|
200
|
|
201 (define_insn_reservation "k6_load_leave" 5
|
|
202 (and (eq_attr "cpu" "k6")
|
|
203 (eq_attr "type" "leave"))
|
|
204 "k6_decode_long,k6_load,(k6_alux|k6_aluy)*2")
|
|
205
|
|
206 ;; ??? From the old pipeline description. Egad!
|
|
207 ;; ??? Apparently we take care of this reservation in adjust_cost.
|
|
208 (define_insn_reservation "k6_load_str" 10
|
|
209 (and (eq_attr "cpu" "k6")
|
|
210 (and (eq_attr "type" "str")
|
|
211 (eq_attr "memory" "load,both")))
|
|
212 "k6_decode_vector,k6_load*10")
|
|
213
|
|
214 ;; The store unit handles lea and push. It is otherwise unmodelled.
|
|
215 (define_insn_reservation "k6_store_lea" 2
|
|
216 (and (eq_attr "cpu" "k6")
|
|
217 (eq_attr "type" "lea"))
|
|
218 "k6_decode_short,k6_store,k6_alux|k6_aluy")
|
|
219
|
|
220 (define_insn_reservation "k6_store_push" 2
|
|
221 (and (eq_attr "cpu" "k6")
|
|
222 (ior (eq_attr "type" "push")
|
|
223 (eq_attr "memory" "store,both")))
|
|
224 "k6_decode_short,k6_store")
|
|
225
|
|
226 (define_insn_reservation "k6_store_str" 10
|
|
227 (and (eq_attr "cpu" "k6")
|
|
228 (eq_attr "type" "str"))
|
|
229 "k6_store*10")
|
|
230
|
|
231 ;; Most FPU instructions have latency 2 and throughput 2.
|
|
232 (define_insn_reservation "k6_fpu" 2
|
|
233 (and (eq_attr "cpu" "k6")
|
|
234 (and (eq_attr "type" "fop,fmov,fcmp,fistp")
|
|
235 (eq_attr "memory" "none")))
|
|
236 "k6_decode_vector,k6_fpu*2")
|
|
237
|
|
238 (define_insn_reservation "k6_fpu_load" 6
|
|
239 (and (eq_attr "cpu" "k6")
|
|
240 (and (eq_attr "type" "fop,fmov,fcmp,fistp")
|
|
241 (eq_attr "memory" "load,both")))
|
|
242 "k6_decode_short,k6_load,k6_fpu*2")
|
|
243
|
|
244 (define_insn_reservation "k6_fpu_store" 6
|
|
245 (and (eq_attr "cpu" "k6")
|
|
246 (and (eq_attr "type" "fop,fmov,fcmp,fistp")
|
|
247 (eq_attr "memory" "store")))
|
|
248 "k6_decode_short,k6_store,k6_fpu*2")
|
|
249
|
|
250 (define_insn_reservation "k6_fpu_fmul" 2
|
|
251 (and (eq_attr "cpu" "k6")
|
|
252 (and (eq_attr "type" "fmul")
|
|
253 (eq_attr "memory" "none")))
|
|
254 "k6_decode_short,k6_fpu*2")
|
|
255
|
|
256 (define_insn_reservation "k6_fpu_fmul_load" 2
|
|
257 (and (eq_attr "cpu" "k6")
|
|
258 (and (eq_attr "type" "fmul")
|
|
259 (eq_attr "memory" "load,both")))
|
|
260 "k6_decode_short,k6_load,k6_fpu*2")
|
|
261
|
|
262 ;; ??? Guessed latencies from the old pipeline description.
|
|
263 (define_insn_reservation "k6_fpu_expensive" 56
|
|
264 (and (eq_attr "cpu" "k6")
|
|
265 (eq_attr "type" "fdiv,fpspc"))
|
|
266 "k6_decode_short,k6_fpu*56")
|
|
267
|