1 ;; Scheduling description for Alpha EV4.
2 ;; Copyright (C) 2002-2025 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 ; On EV4 there are two classes of resources to consider: resources needed
21 ; to issue, and resources needed to execute. IBUS[01] are in the first
22 ; category. ABOX, BBOX, EBOX, FBOX, IMUL & FDIV make up the second.
23 ; (There are a few other register-like resources, but ...)
25 (define_automaton "ev4_0,ev4_1,ev4_2")
26 (define_cpu_unit "ev4_ib0,ev4_ib1,ev4_abox,ev4_bbox" "ev4_0")
27 (define_cpu_unit "ev4_ebox,ev4_imul" "ev4_1")
28 (define_cpu_unit "ev4_fbox,ev4_fdiv" "ev4_2")
29 (define_reservation "ev4_ib01" "ev4_ib0|ev4_ib1")
31 ; Assume type "multi" single issues.
32 (define_insn_reservation "ev4_multi" 1
33 (and (eq_attr "tune" "ev4")
34 (eq_attr "type" "multi"))
37 ; Loads from L0 completes in three cycles. adjust_cost still factors
38 ; in user-specified memory latency, so return 1 here.
39 (define_insn_reservation "ev4_ld" 1
40 (and (eq_attr "tune" "ev4")
41 (eq_attr "type" "ild,fld,ldsym,ld_l"))
44 ; Stores can issue before the data (but not address) is ready.
45 (define_insn_reservation "ev4_ist" 1
46 (and (eq_attr "tune" "ev4")
47 (eq_attr "type" "ist,st_c"))
50 (define_insn_reservation "ev4_fst" 1
51 (and (eq_attr "tune" "ev4")
52 (eq_attr "type" "fst"))
55 ; Memory barrier blocks ABOX insns until it's acknowledged by the external
56 ; memory bus. This may be *quite* slow. Setting this to 4 cycles gets
57 ; about all the benefit without making the DFA too large.
58 (define_insn_reservation "ev4_mb" 4
59 (and (eq_attr "tune" "ev4")
60 (eq_attr "type" "mb"))
61 "ev4_ib1+ev4_abox,ev4_abox*3")
63 ; Branches have no delay cost, but do tie up the unit for two cycles.
64 (define_insn_reservation "ev4_ibr" 2
65 (and (eq_attr "tune" "ev4")
66 (eq_attr "type" "ibr,jsr"))
67 "ev4_ib1+ev4_bbox,ev4_bbox")
69 (define_insn_reservation "ev4_callpal" 2
70 (and (eq_attr "tune" "ev4")
71 (eq_attr "type" "callpal"))
72 "ev4_ib1+ev4_bbox,ev4_bbox")
74 (define_insn_reservation "ev4_fbr" 2
75 (and (eq_attr "tune" "ev4")
76 (eq_attr "type" "fbr"))
77 "ev4_ib0+ev4_bbox,ev4_bbox")
79 ; Arithmetic insns are normally have their results available after
80 ; two cycles. There are a number of exceptions.
82 (define_insn_reservation "ev4_iaddlog" 2
83 (and (eq_attr "tune" "ev4")
84 (eq_attr "type" "iadd,ilog"))
89 "ev4_ibr,ev4_iaddlog,ev4_shiftcm,ev4_icmp,ev4_imulsi,ev4_imuldi")
91 (define_insn_reservation "ev4_shiftcm" 2
92 (and (eq_attr "tune" "ev4")
93 (eq_attr "type" "shift,icmov"))
96 (define_insn_reservation "ev4_icmp" 2
97 (and (eq_attr "tune" "ev4")
98 (eq_attr "type" "icmp"))
101 (define_bypass 1 "ev4_icmp" "ev4_ibr")
104 "ev4_iaddlog,ev4_shiftcm,ev4_icmp"
106 "alpha_store_data_bypass_p")
108 ; Multiplies use a non-pipelined imul unit. Also, "no [ebox] insn can
109 ; be issued exactly three cycles before an integer multiply completes".
111 (define_insn_reservation "ev4_imulsi" 21
112 (and (eq_attr "tune" "ev4")
113 (and (eq_attr "type" "imul")
114 (eq_attr "opsize" "si")))
115 "ev4_ib0+ev4_imul,ev4_imul*18,ev4_ebox")
117 (define_bypass 20 "ev4_imulsi" "ev4_ist" "alpha_store_data_bypass_p")
119 (define_insn_reservation "ev4_imuldi" 23
120 (and (eq_attr "tune" "ev4")
121 (and (eq_attr "type" "imul")
122 (eq_attr "opsize" "!si")))
123 "ev4_ib0+ev4_imul,ev4_imul*20,ev4_ebox")
125 (define_bypass 22 "ev4_imuldi" "ev4_ist" "alpha_store_data_bypass_p")
127 ; Most FP insns have a 6 cycle latency, but with a 4 cycle bypass back in.
128 (define_insn_reservation "ev4_fpop" 6
129 (and (eq_attr "tune" "ev4")
130 (eq_attr "type" "fadd,fmul,fcpys,fcmov"))
133 (define_bypass 4 "ev4_fpop" "ev4_fpop")
135 ; The floating point divider is not pipelined. Also, "no FPOP insn can be
136 ; issued exactly five or exactly six cycles before an fdiv insn completes".
138 (define_insn_reservation "ev4_fdivsf" 34
139 (and (eq_attr "tune" "ev4")
140 (and (eq_attr "type" "fdiv")
141 (eq_attr "opsize" "si")))
142 "ev4_ib1+ev4_fdiv,ev4_fdiv*28,ev4_fdiv+ev4_fbox,ev4_fbox")
144 (define_insn_reservation "ev4_fdivdf" 63
145 (and (eq_attr "tune" "ev4")
146 (and (eq_attr "type" "fdiv")
147 (eq_attr "opsize" "di")))
148 "ev4_ib1+ev4_fdiv,ev4_fdiv*57,ev4_fdiv+ev4_fbox,ev4_fbox")
150 ; Traps don't consume or produce data.
151 (define_insn_reservation "ev4_misc" 1
152 (and (eq_attr "tune" "ev4")
153 (eq_attr "type" "misc"))