1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
|
;; Scheduling description for UltraSPARC-I/II.
;; Copyright (C) 2002-2019 Free Software Foundation, Inc.
;;
;; This file is part of GCC.
;;
;; GCC is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;;
;; GCC is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with GCC; see the file COPYING3. If not see
;; <http://www.gnu.org/licenses/>.
;; UltraSPARC-I and II are quad-issue processors. Interesting features
;; to note:
;;
;; - Buffered loads, they can queue waiting for the actual data until
;; an instruction actually tries to reference the destination register
;; as an input
;; - Two integer units. Only one of them can do shifts, and the other
;; is the only one which may do condition code setting instructions.
;; Complicating things further, a shift may go only into the first
;; slot in a dispatched group. And if you have a non-condition code
;; setting instruction and one that does set the condition codes. The
;; former must be issued first in order for both of them to issue.
;; - Stores can issue before the value being stored is available. As long
;; as the input data becomes ready before the store is to move out of the
;; store buffer, it will not cause a stall.
;; - Branches may issue in the same cycle as an instruction setting the
;; condition codes being tested by that branch. This does not apply
;; to floating point, only integer.
(define_automaton "ultrasparc_0,ultrasparc_1")
(define_cpu_unit "us1_fdivider,us1_fpm" "ultrasparc_0");
(define_cpu_unit "us1_fpa,us1_load_writeback" "ultrasparc_1")
(define_cpu_unit "us1_fps_0,us1_fps_1,us1_fpd_0,us1_fpd_1" "ultrasparc_1")
(define_cpu_unit "us1_slot0,us1_slot1,us1_slot2,us1_slot3" "ultrasparc_1")
(define_cpu_unit "us1_ieu0,us1_ieu1,us1_cti,us1_lsu" "ultrasparc_1")
(define_reservation "us1_slot012" "(us1_slot0 | us1_slot1 | us1_slot2)")
(define_reservation "us1_slotany" "(us1_slot0 | us1_slot1 | us1_slot2 | us1_slot3)")
(define_reservation "us1_single_issue" "us1_slot0 + us1_slot1 + us1_slot2 + us1_slot3")
(define_reservation "us1_fp_single" "(us1_fps_0 | us1_fps_1)")
(define_reservation "us1_fp_double" "(us1_fpd_0 | us1_fpd_1)")
;; This is a simplified representation of the issue at hand.
;; For most cases, going from one FP precision type insn to another
;; just breaks up the insn group. However for some cases, such
;; a situation causes the second insn to stall 2 more cycles.
(exclusion_set "us1_fps_0,us1_fps_1" "us1_fpd_0,us1_fpd_1")
;; If we have to schedule an ieu1 specific instruction and we want
;; to reserve the ieu0 unit as well, we must reserve it first. So for
;; example we could not schedule this sequence:
;; COMPARE IEU1
;; IALU IEU0
;; but we could schedule them together like this:
;; IALU IEU0
;; COMPARE IEU1
;; This basically requires that ieu0 is reserved before ieu1 when
;; it is required that both be reserved.
(absence_set "us1_ieu0" "us1_ieu1")
;; This defines the slotting order. Most IEU instructions can only
;; execute in the first three slots, FPU and branches can go into
;; any slot. We represent instructions which "break the group"
;; as requiring reservation of us1_slot0.
(absence_set "us1_slot0" "us1_slot1,us1_slot2,us1_slot3")
(absence_set "us1_slot1" "us1_slot2,us1_slot3")
(absence_set "us1_slot2" "us1_slot3")
(define_insn_reservation "us1_single" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "multi,savew,flushw,iflush,trap,gsr"))
"us1_single_issue")
(define_insn_reservation "us1_simple_ieuN" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "ialu"))
"(us1_ieu0 | us1_ieu1) + us1_slot012")
(define_insn_reservation "us1_simple_ieu0" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "shift"))
"us1_ieu0 + us1_slot012")
(define_insn_reservation "us1_simple_ieu1" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "compare,edge,edgen,array"))
"us1_ieu1 + us1_slot012")
(define_insn_reservation "us1_ialuX" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "ialuX"))
"us1_single_issue")
(define_insn_reservation "us1_cmove" 2
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "cmove"))
"us1_single_issue, nothing")
(define_insn_reservation "us1_imul" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "imul"))
"us1_single_issue")
(define_insn_reservation "us1_idiv" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "idiv"))
"us1_single_issue")
;; For loads, the "delayed return mode" behavior of the chip
;; is represented using the us1_load_writeback resource.
(define_insn_reservation "us1_load" 2
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "load,fpload"))
"us1_lsu + us1_slot012, us1_load_writeback")
(define_insn_reservation "us1_load_signed" 3
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "sload"))
"us1_lsu + us1_slot012, nothing, us1_load_writeback")
(define_insn_reservation "us1_store" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "store,fpstore"))
"us1_lsu + us1_slot012")
(define_insn_reservation "us1_branch" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "branch"))
"us1_cti + us1_slotany")
(define_insn_reservation "us1_call_jmpl" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "call,sibcall,call_no_delay_slot,uncond_branch"))
"us1_cti + us1_ieu1 + us1_slot0")
(define_insn_reservation "us1_fmov_single" 1
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpmove"))
(eq_attr "fptype" "single"))
"us1_fpa + us1_fp_single + us1_slotany")
(define_insn_reservation "us1_fmov_double" 1
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpmove"))
(eq_attr "fptype" "double"))
"us1_fpa + us1_fp_double + us1_slotany")
(define_insn_reservation "us1_fcmov_single" 2
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpcmove,fpcrmove"))
(eq_attr "fptype" "single"))
"us1_fpa + us1_fp_single + us1_slotany, nothing")
(define_insn_reservation "us1_fcmov_double" 2
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpcmove,fpcrmove"))
(eq_attr "fptype" "double"))
"us1_fpa + us1_fp_double + us1_slotany, nothing")
(define_insn_reservation "us1_faddsub_single" 4
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fp"))
(eq_attr "fptype" "single"))
"us1_fpa + us1_fp_single + us1_slotany, nothing*3")
(define_insn_reservation "us1_faddsub_double" 4
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fp"))
(eq_attr "fptype" "double"))
"us1_fpa + us1_fp_double + us1_slotany, nothing*3")
(define_insn_reservation "us1_fpcmp_single" 1
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpcmp"))
(eq_attr "fptype" "single"))
"us1_fpa + us1_fp_single + us1_slotany")
(define_insn_reservation "us1_fpcmp_double" 1
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpcmp"))
(eq_attr "fptype" "double"))
"us1_fpa + us1_fp_double + us1_slotany")
(define_insn_reservation "us1_fmult_single" 4
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpmul"))
(eq_attr "fptype" "single"))
"us1_fpm + us1_fp_single + us1_slotany, nothing*3")
(define_insn_reservation "us1_fmult_double" 4
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpmul"))
(eq_attr "fptype" "double"))
"us1_fpm + us1_fp_double + us1_slotany, nothing*3")
;; This is actually in theory dangerous, because it is possible
;; for the chip to prematurely dispatch the dependent instruction
;; in the G stage, resulting in a 9 cycle stall. However I have never
;; been able to trigger this case myself even with hand written code,
;; so it must require some rare complicated pipeline state.
(define_bypass 3
"us1_faddsub_single,us1_faddsub_double,us1_fmult_single,us1_fmult_double"
"us1_faddsub_single,us1_faddsub_double,us1_fmult_single,us1_fmult_double")
;; Floating point divide and square root use the multiplier unit
;; for final rounding 3 cycles before the divide/sqrt is complete.
(define_insn_reservation "us1_fdivs"
13
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpdivs,fpsqrts"))
"(us1_fpm + us1_fdivider + us1_slot0), us1_fdivider*8, (us1_fpm + us1_fdivider), us1_fdivider*2"
)
(define_bypass
12
"us1_fdivs"
"us1_faddsub_single,us1_faddsub_double,us1_fmult_single,us1_fmult_double")
(define_insn_reservation "us1_fdivd"
23
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpdivd,fpsqrtd"))
"(us1_fpm + us1_fdivider + us1_slot0), us1_fdivider*18, (us1_fpm + us1_fdivider), us1_fdivider*2"
)
(define_bypass
22
"us1_fdivd"
"us1_faddsub_single,us1_faddsub_double,us1_fmult_single,us1_fmult_double")
;; Any store may multi issue with the insn creating the source
;; data as long as that creating insn is not an FPU div/sqrt.
;; We need a special guard function because this bypass does
;; not apply to the address inputs of the store.
(define_bypass 0 "us1_simple_ieuN,us1_simple_ieu1,us1_simple_ieu0,us1_faddsub_single,us1_faddsub_double,us1_fmov_single,us1_fmov_double,us1_fcmov_single,us1_fcmov_double,us1_fmult_single,us1_fmult_double" "us1_store"
"store_data_bypass_p")
;; An integer branch may execute in the same cycle as the compare
;; creating the condition codes.
(define_bypass 0 "us1_simple_ieu1" "us1_branch")
;; VIS scheduling
(define_insn_reservation "us1_fga_single"
2
(and (and
(eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fga,visl,vismv"))
(eq_attr "fptype" "single"))
"us1_fpa + us1_fp_single + us1_slotany, nothing")
(define_bypass 1 "us1_fga_single" "us1_fga_single")
(define_insn_reservation "us1_fga_double"
2
(and (eq_attr "cpu" "ultrasparc")
(ior (and (eq_attr "type" "fga,visl,vismv")
(eq_attr "fptype" "double"))
(eq_attr "type" "viscmp")))
"us1_fpa + us1_fp_double + us1_slotany, nothing")
(define_bypass 1 "us1_fga_double" "us1_fga_double")
(define_insn_reservation "us1_fgm_single"
4
(and (and
(eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fgm_pack,fgm_mul"))
(eq_attr "fptype" "single"))
"us1_fpm + us1_fp_single + us1_slotany, nothing*3")
(define_bypass 3 "us1_fgm_single" "us1_fga_single")
(define_insn_reservation "us1_fgm_double"
4
(and (and
(eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fgm_pack,fgm_mul"))
(eq_attr "fptype" "double"))
"us1_fpm + us1_fp_double + us1_slotany, nothing*3")
(define_bypass 3 "us1_fgm_double" "us1_fga_double")
(define_insn_reservation "us1_pdist"
4
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "pdist"))
"us1_fpm + us1_fp_double + us1_slotany, nothing*3")
(define_bypass 3 "us1_pdist" "us1_fga_double,us1_fga_single")
(define_bypass 1 "us1_pdist" "us1_pdist")
|
