1 ;; Scheduling description for Alpha EV6.
2 ;; Copyright (C) 2002, 2004, 2005 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 2, 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 COPYING. If not, write to
18 ;; the Free Software Foundation, 51 Franklin Street, Fifth Floor,
19 ;; Boston, MA 02110-1301, USA.
21 ; EV6 can issue 4 insns per clock. It's out-of-order, so this isn't
22 ; expected to help over-much, but a precise description can be important
23 ; for software pipelining.
25 ; EV6 has two symmetric pairs ("clusters") of two asymmetric integer
26 ; units ("upper" and "lower"), yielding pipe names U0, U1, L0, L1.
28 ; ??? The clusters have independent register files that are re-synced
29 ; every cycle. Thus there is one additional cycle of latency between
30 ; insns issued on different clusters. Possibly model that by duplicating
31 ; all EBOX insn_reservations that can issue to either cluster, increasing
32 ; all latencies by one, and adding bypasses within the cluster.
34 ; ??? In addition, instruction order affects cluster issue.
36 (define_automaton "ev6_0,ev6_1")
37 (define_cpu_unit "ev6_u0,ev6_u1,ev6_l0,ev6_l1" "ev6_0")
38 (define_reservation "ev6_u" "ev6_u0|ev6_u1")
39 (define_reservation "ev6_l" "ev6_l0|ev6_l1")
40 (define_reservation "ev6_ebox" "ev6_u|ev6_l")
42 (define_cpu_unit "ev6_fa" "ev6_1")
43 (define_cpu_unit "ev6_fm,ev6_fst0,ev6_fst1" "ev6_0")
44 (define_reservation "ev6_fst" "ev6_fst0|ev6_fst1")
46 ; Assume type "multi" single issues.
47 (define_insn_reservation "ev6_multi" 1
48 (and (eq_attr "tune" "ev6")
49 (eq_attr "type" "multi"))
50 "ev6_u0+ev6_u1+ev6_l0+ev6_l1+ev6_fa+ev6_fm+ev6_fst0+ev6_fst1")
52 ; Integer loads take at least 3 clocks, and only issue to lower units.
53 ; adjust_cost still factors in user-specified memory latency, so return 1 here.
54 (define_insn_reservation "ev6_ild" 1
55 (and (eq_attr "tune" "ev6")
56 (eq_attr "type" "ild,ldsym,ld_l"))
59 (define_insn_reservation "ev6_ist" 1
60 (and (eq_attr "tune" "ev6")
61 (eq_attr "type" "ist,st_c"))
64 (define_insn_reservation "ev6_mb" 1
65 (and (eq_attr "tune" "ev6")
66 (eq_attr "type" "mb"))
69 ; FP loads take at least 4 clocks. adjust_cost still factors
70 ; in user-specified memory latency, so return 2 here.
71 (define_insn_reservation "ev6_fld" 2
72 (and (eq_attr "tune" "ev6")
73 (eq_attr "type" "fld"))
76 ; The FPU communicates with memory and the integer register file
77 ; via two fp store units. We need a slot in the fst immediately, and
78 ; a slot in LOW after the operand data is ready. At which point the
79 ; data may be moved either to the store queue or the integer register
80 ; file and the insn retired.
82 (define_insn_reservation "ev6_fst" 3
83 (and (eq_attr "tune" "ev6")
84 (eq_attr "type" "fst"))
85 "ev6_fst,nothing,ev6_l")
87 ; Arithmetic goes anywhere.
88 (define_insn_reservation "ev6_arith" 1
89 (and (eq_attr "tune" "ev6")
90 (eq_attr "type" "iadd,ilog,icmp"))
93 ; Motion video insns also issue only to U0, and take three ticks.
94 (define_insn_reservation "ev6_mvi" 3
95 (and (eq_attr "tune" "ev6")
96 (eq_attr "type" "mvi"))
99 ; Shifts issue to upper units.
100 (define_insn_reservation "ev6_shift" 1
101 (and (eq_attr "tune" "ev6")
102 (eq_attr "type" "shift"))
105 ; Multiplies issue only to U1, and all take 7 ticks.
106 (define_insn_reservation "ev6_imul" 7
107 (and (eq_attr "tune" "ev6")
108 (eq_attr "type" "imul"))
111 ; Conditional moves decompose into two independent primitives, each taking
112 ; one cycle. Since ev6 is out-of-order, we can't see anything but two cycles.
113 (define_insn_reservation "ev6_icmov" 2
114 (and (eq_attr "tune" "ev6")
115 (eq_attr "type" "icmov"))
118 ; Integer branches issue to upper units
119 (define_insn_reservation "ev6_ibr" 1
120 (and (eq_attr "tune" "ev6")
121 (eq_attr "type" "ibr,callpal"))
124 ; Calls only issue to L0.
125 (define_insn_reservation "ev6_jsr" 1
126 (and (eq_attr "tune" "ev6")
127 (eq_attr "type" "jsr"))
130 ; Ftoi/itof only issue to lower pipes.
131 (define_insn_reservation "ev6_itof" 3
132 (and (eq_attr "tune" "ev6")
133 (eq_attr "type" "itof"))
136 (define_insn_reservation "ev6_ftoi" 3
137 (and (eq_attr "tune" "ev6")
138 (eq_attr "type" "ftoi"))
139 "ev6_fst,nothing,ev6_l")
141 (define_insn_reservation "ev6_fmul" 4
142 (and (eq_attr "tune" "ev6")
143 (eq_attr "type" "fmul"))
146 (define_insn_reservation "ev6_fadd" 4
147 (and (eq_attr "tune" "ev6")
148 (eq_attr "type" "fadd,fcpys,fbr"))
151 (define_insn_reservation "ev6_fcmov" 8
152 (and (eq_attr "tune" "ev6")
153 (eq_attr "type" "fcmov"))
154 "ev6_fa,nothing*3,ev6_fa")
156 (define_insn_reservation "ev6_fdivsf" 12
157 (and (eq_attr "tune" "ev6")
158 (and (eq_attr "type" "fdiv")
159 (eq_attr "opsize" "si")))
162 (define_insn_reservation "ev6_fdivdf" 15
163 (and (eq_attr "tune" "ev6")
164 (and (eq_attr "type" "fdiv")
165 (eq_attr "opsize" "di")))
168 (define_insn_reservation "ev6_sqrtsf" 18
169 (and (eq_attr "tune" "ev6")
170 (and (eq_attr "type" "fsqrt")
171 (eq_attr "opsize" "si")))
174 (define_insn_reservation "ev6_sqrtdf" 33
175 (and (eq_attr "tune" "ev6")
176 (and (eq_attr "type" "fsqrt")
177 (eq_attr "opsize" "di")))