1 ;; Scheduling description for Alpha EV6.
2 ;; Copyright (C) 2002, 2004, 2005, 2007 Free Software Foundation, Inc.
4 ;; This file is part of GCC.
6 ;; GCC is free software; you can redistribute it and/or modify
7 ;; it under the terms of the GNU General Public License as published by
8 ;; the Free Software Foundation; either version 3, or (at your option)
11 ;; GCC is distributed in the hope that it will be useful,
12 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ;; GNU General Public License for more details.
16 ;; You should have received a copy of the GNU General Public License
17 ;; along with GCC; see the file COPYING3. If not see
18 ;; <http://www.gnu.org/licenses/>.
20 ; EV6 can issue 4 insns per clock. It's out-of-order, so this isn't
21 ; expected to help over-much, but a precise description can be important
22 ; for software pipelining.
24 ; EV6 has two symmetric pairs ("clusters") of two asymmetric integer
25 ; units ("upper" and "lower"), yielding pipe names U0, U1, L0, L1.
27 ; ??? The clusters have independent register files that are re-synced
28 ; every cycle. Thus there is one additional cycle of latency between
29 ; insns issued on different clusters. Possibly model that by duplicating
30 ; all EBOX insn_reservations that can issue to either cluster, increasing
31 ; all latencies by one, and adding bypasses within the cluster.
33 ; ??? In addition, instruction order affects cluster issue.
35 (define_automaton "ev6_0,ev6_1")
36 (define_cpu_unit "ev6_u0,ev6_u1,ev6_l0,ev6_l1" "ev6_0")
37 (define_reservation "ev6_u" "ev6_u0|ev6_u1")
38 (define_reservation "ev6_l" "ev6_l0|ev6_l1")
39 (define_reservation "ev6_ebox" "ev6_u|ev6_l")
41 (define_cpu_unit "ev6_fa" "ev6_1")
42 (define_cpu_unit "ev6_fm,ev6_fst0,ev6_fst1" "ev6_0")
43 (define_reservation "ev6_fst" "ev6_fst0|ev6_fst1")
45 ; Assume type "multi" single issues.
46 (define_insn_reservation "ev6_multi" 1
47 (and (eq_attr "tune" "ev6")
48 (eq_attr "type" "multi"))
49 "ev6_u0+ev6_u1+ev6_l0+ev6_l1+ev6_fa+ev6_fm+ev6_fst0+ev6_fst1")
51 ; Integer loads take at least 3 clocks, and only issue to lower units.
52 ; adjust_cost still factors in user-specified memory latency, so return 1 here.
53 (define_insn_reservation "ev6_ild" 1
54 (and (eq_attr "tune" "ev6")
55 (eq_attr "type" "ild,ldsym,ld_l"))
58 (define_insn_reservation "ev6_ist" 1
59 (and (eq_attr "tune" "ev6")
60 (eq_attr "type" "ist,st_c"))
63 (define_insn_reservation "ev6_mb" 1
64 (and (eq_attr "tune" "ev6")
65 (eq_attr "type" "mb"))
68 ; FP loads take at least 4 clocks. adjust_cost still factors
69 ; in user-specified memory latency, so return 2 here.
70 (define_insn_reservation "ev6_fld" 2
71 (and (eq_attr "tune" "ev6")
72 (eq_attr "type" "fld"))
75 ; The FPU communicates with memory and the integer register file
76 ; via two fp store units. We need a slot in the fst immediately, and
77 ; a slot in LOW after the operand data is ready. At which point the
78 ; data may be moved either to the store queue or the integer register
79 ; file and the insn retired.
81 (define_insn_reservation "ev6_fst" 3
82 (and (eq_attr "tune" "ev6")
83 (eq_attr "type" "fst"))
84 "ev6_fst,nothing,ev6_l")
86 ; Arithmetic goes anywhere.
87 (define_insn_reservation "ev6_arith" 1
88 (and (eq_attr "tune" "ev6")
89 (eq_attr "type" "iadd,ilog,icmp"))
92 ; Motion video insns also issue only to U0, and take three ticks.
93 (define_insn_reservation "ev6_mvi" 3
94 (and (eq_attr "tune" "ev6")
95 (eq_attr "type" "mvi"))
98 ; Shifts issue to upper units.
99 (define_insn_reservation "ev6_shift" 1
100 (and (eq_attr "tune" "ev6")
101 (eq_attr "type" "shift"))
104 ; Multiplies issue only to U1, and all take 7 ticks.
105 (define_insn_reservation "ev6_imul" 7
106 (and (eq_attr "tune" "ev6")
107 (eq_attr "type" "imul"))
110 ; Conditional moves decompose into two independent primitives, each taking
111 ; one cycle. Since ev6 is out-of-order, we can't see anything but two cycles.
112 (define_insn_reservation "ev6_icmov" 2
113 (and (eq_attr "tune" "ev6")
114 (eq_attr "type" "icmov"))
117 ; Integer branches issue to upper units
118 (define_insn_reservation "ev6_ibr" 1
119 (and (eq_attr "tune" "ev6")
120 (eq_attr "type" "ibr,callpal"))
123 ; Calls only issue to L0.
124 (define_insn_reservation "ev6_jsr" 1
125 (and (eq_attr "tune" "ev6")
126 (eq_attr "type" "jsr"))
129 ; Ftoi/itof only issue to lower pipes.
130 (define_insn_reservation "ev6_itof" 3
131 (and (eq_attr "tune" "ev6")
132 (eq_attr "type" "itof"))
135 (define_insn_reservation "ev6_ftoi" 3
136 (and (eq_attr "tune" "ev6")
137 (eq_attr "type" "ftoi"))
138 "ev6_fst,nothing,ev6_l")
140 (define_insn_reservation "ev6_fmul" 4
141 (and (eq_attr "tune" "ev6")
142 (eq_attr "type" "fmul"))
145 (define_insn_reservation "ev6_fadd" 4
146 (and (eq_attr "tune" "ev6")
147 (eq_attr "type" "fadd,fcpys,fbr"))
150 (define_bypass 6 "ev6_fmul,ev6_fadd" "ev6_fst,ev6_ftoi")
152 (define_insn_reservation "ev6_fcmov" 8
153 (and (eq_attr "tune" "ev6")
154 (eq_attr "type" "fcmov"))
155 "ev6_fa,nothing*3,ev6_fa")
157 (define_bypass 10 "ev6_fcmov" "ev6_fst,ev6_ftoi")
159 (define_insn_reservation "ev6_fdivsf" 12
160 (and (eq_attr "tune" "ev6")
161 (and (eq_attr "type" "fdiv")
162 (eq_attr "opsize" "si")))
165 (define_insn_reservation "ev6_fdivdf" 15
166 (and (eq_attr "tune" "ev6")
167 (and (eq_attr "type" "fdiv")
168 (eq_attr "opsize" "di")))
171 (define_insn_reservation "ev6_sqrtsf" 18
172 (and (eq_attr "tune" "ev6")
173 (and (eq_attr "type" "fsqrt")
174 (eq_attr "opsize" "si")))
177 (define_insn_reservation "ev6_sqrtdf" 33
178 (and (eq_attr "tune" "ev6")
179 (and (eq_attr "type" "fsqrt")
180 (eq_attr "opsize" "di")))