gcc/config/sh/sh1.md

;; 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/.

;; Load and store instructions save a cycle if they are aligned on a ;; four byte boundary. Using a function unit for stores encourages ;; gcc to separate load and store instructions by one instruction, ;; which makes it more likely that the linker will be able to word ;; align them when relaxing.

;; SH-1 scheduling. This is just a conversion of the old scheduling ;; model, using define_function_unit.

(define_automaton “sh1”) (define_cpu_unit “sh1memory,sh1int,sh1mpy,sh1fp” “sh1”)

;; Loads have a latency of two. ;; However, call insns can have a delay slot, so that we want one more ;; insn to be scheduled between the load of the function address and the call. ;; This is equivalent to a latency of three. ;; ADJUST_COST can only properly handle reductions of the cost, so we ;; use a latency of three here. ;; We only do this for SImode loads of general registers, to make the work ;; for ADJUST_COST easier. (define_insn_reservation “sh1_load_si” 3 (and (eq_attr “pipe_model” “sh1”) (eq_attr “type” “load_si,pcload_si”)) “sh1memory*2”)

(define_insn_reservation “sh1_load_store” 2 (and (eq_attr “pipe_model” “sh1”) (eq_attr “type” “load,pcload,pload,mem_mac,store,fstore,pstore,mac_mem”)) “sh1memory*2”)

(define_insn_reservation “sh1_arith3” 3 (and (eq_attr “pipe_model” “sh1”) (eq_attr “type” “arith3,arith3b”)) “sh1int*3”)

(define_insn_reservation “sh1_dyn_shift” 2 (and (eq_attr “pipe_model” “sh1”) (eq_attr “type” “dyn_shift”)) “sh1int*2”)

(define_insn_reservation “sh1_int” 1 (and (eq_attr “pipe_model” “sh1”) (eq_attr “type” “!arith3,arith3b,dyn_shift”)) “sh1int”)

;; ??? These are approximations. (define_insn_reservation “sh1_smpy” 2 (and (eq_attr “pipe_model” “sh1”) (eq_attr “type” “smpy”)) “sh1mpy*2”)

(define_insn_reservation “sh1_dmpy” 3 (and (eq_attr “pipe_model” “sh1”) (eq_attr “type” “dmpy”)) “sh1mpy*3”)

(define_insn_reservation “sh1_fp” 2 (and (eq_attr “pipe_model” “sh1”) (eq_attr “type” “fp,fpscr_toggle,fp_cmp,fmove”)) “sh1fp”)

(define_insn_reservation “sh1_fdiv” 13 (and (eq_attr “pipe_model” “sh1”) (eq_attr “type” “fdiv”)) “sh1fp*12”)