1 ;; DFA scheduling description for Renesas / SuperH SH.
2 ;; Copyright (C) 2004 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 ;; Load and store instructions save a cycle if they are aligned on a
22 ;; four byte boundary. Using a function unit for stores encourages
23 ;; gcc to separate load and store instructions by one instruction,
24 ;; which makes it more likely that the linker will be able to word
25 ;; align them when relaxing.
27 ;; SH-1 scheduling. This is just a conversion of the old scheduling
28 ;; model, using define_function_unit.
30 (define_automaton "sh1")
31 (define_cpu_unit "sh1memory,sh1int,sh1mpy,sh1fp" "sh1")
33 ;; Loads have a latency of two.
34 ;; However, call insns can have a delay slot, so that we want one more
35 ;; insn to be scheduled between the load of the function address and the call.
36 ;; This is equivalent to a latency of three.
37 ;; ADJUST_COST can only properly handle reductions of the cost, so we
38 ;; use a latency of three here.
39 ;; We only do this for SImode loads of general registers, to make the work
40 ;; for ADJUST_COST easier.
41 (define_insn_reservation "sh1_load_si" 3
42 (and (eq_attr "pipe_model" "sh1")
43 (eq_attr "type" "load_si,pcload_si"))
46 (define_insn_reservation "sh1_load_store" 2
47 (and (eq_attr "pipe_model" "sh1")
48 (eq_attr "type" "load,pcload,pload,store,pstore"))
51 (define_insn_reservation "sh1_arith3" 3
52 (and (eq_attr "pipe_model" "sh1")
53 (eq_attr "type" "arith3,arith3b"))
56 (define_insn_reservation "sh1_dyn_shift" 2
57 (and (eq_attr "pipe_model" "sh1")
58 (eq_attr "type" "dyn_shift"))
61 (define_insn_reservation "sh1_int" 1
62 (and (eq_attr "pipe_model" "sh1")
63 (eq_attr "type" "!arith3,arith3b,dyn_shift"))
66 ;; ??? These are approximations.
67 (define_insn_reservation "sh1_smpy" 2
68 (and (eq_attr "pipe_model" "sh1")
69 (eq_attr "type" "smpy"))
72 (define_insn_reservation "sh1_dmpy" 3
73 (and (eq_attr "pipe_model" "sh1")
74 (eq_attr "type" "dmpy"))
77 (define_insn_reservation "sh1_fp" 2
78 (and (eq_attr "pipe_model" "sh1")
79 (eq_attr "type" "fp,fmove"))
82 (define_insn_reservation "sh1_fdiv" 13
83 (and (eq_attr "pipe_model" "sh1")
84 (eq_attr "type" "fdiv"))