;; Scheduling description for the Xilinx PowerPC 405 APU Floating Point Unit. ;; Copyright (C) 2008-2015 Free Software Foundation, Inc. ;; Contributed by Michael Eager (eager@eagercon.com). ;; ;; 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/.
;;---------------------------------------------------- ;; Xilinx APU FPU Pipeline Description ;; ;; - attr ‘type’ and ‘fp_type’ should definitely ;; be cleaned up at some point in the future. ;; ddiv,sdiv,dmul,smul etc are quite confusing. ;; Should use consistent fp* attrs. ‘fp_type’ ;; should also go away, leaving us only with ‘fp’ ;; ;;----------------------------------------------------
;; ------------------------------------------------------------------------- ;; Latencies ;; Latest latency figures (all in FCB cycles). PowerPC to FPU frequency ratio ;; assumed to be 1/2. (most common deployment) ;; Add 2 PPC cycles for (register file access + wb) and 2 PPC cycles ;; for issue (from PPC) ;; SP DP ;; Loads: 4 6 ;; Stores: 1 2 (from availability of data) ;; Move/Abs/Neg: 1 1 ;; Add/Subtract: 5 7 ;; Multiply: 4 11 ;; Multiply-add: 10 19 ;; Convert (any): 4 6 ;; Divide/Sqrt: 27 56 ;; Compares: 1 2 ;; ;; bypasses needed for forwarding capability of the FPU. ;; Add this at some future time. ;; ------------------------------------------------------------------------- (define_automaton “Xfpu”) (define_cpu_unit “Xfpu_issue,Xfpu_addsub,Xfpu_mul,Xfpu_div,Xfpu_sqrt” “Xfpu”)
(define_insn_reservation “fp-default” 2 (and (and (eq_attr “type” “fp”) (eq_attr “fp_type” “fp_default”)) (eq_attr “cpu” “ppc405”)) “Xfpu_issue*2”)
(define_insn_reservation “fp-compare” 6 (and (eq_attr “type” “fpcompare”) ;; Inconsistent naming (eq_attr “cpu” “ppc405”)) “Xfpu_issue*2,Xfpu_addsub”)
(define_insn_reservation “fp-addsub-s” 14 (and (and (eq_attr “type” “fp”) (eq_attr “fp_type” “fp_addsub_s”)) (eq_attr “cpu” “ppc405”)) “Xfpu_issue*2,Xfpu_addsub”)
(define_insn_reservation “fp-addsub-d” 18 (and (and (eq_attr “type” “fp”) (eq_attr “fp_type” “fp_addsub_d”)) (eq_attr “cpu” “ppc405”)) “Xfpu_issue*2,Xfpu_addsub”)
(define_insn_reservation “fp-mul-s” 12 (and (and (eq_attr “type” “fp”) (eq_attr “fp_type” “fp_mul_s”)) (eq_attr “cpu” “ppc405”)) “Xfpu_issue*2,Xfpu_mul”)
(define_insn_reservation “fp-mul-d” 16 ;; Actually 28. Long latencies are killing the automaton formation. Need to figure out why. (and (and (eq_attr “type” “fp”) (eq_attr “fp_type” “fp_mul_d”)) (eq_attr “cpu” “ppc405”)) “Xfpu_issue*2,Xfpu_mul”)
(define_insn_reservation “fp-div-s” 24 ;; Actually 34 (and (eq_attr “type” “sdiv”) ;; Inconsistent attr naming (eq_attr “cpu” “ppc405”)) “Xfpu_issue2,Xfpu_div10”) ;; Unpipelined
(define_insn_reservation “fp-div-d” 34 ;; Actually 116 (and (eq_attr “type” “ddiv”) (eq_attr “cpu” “ppc405”)) ;; Inconsistent attr naming “Xfpu_issue2,Xfpu_div10”) ;; Unpipelined
(define_insn_reservation “fp-maddsub-s” 24 (and (and (eq_attr “type” “fp”) (eq_attr “fp_type” “fp_maddsub_s”)) (eq_attr “cpu” “ppc405”)) “Xfpu_issue2,Xfpu_mul,nothing7,Xfpu_addsub”)
(define_insn_reservation “fp-maddsub-d” 34 ;; Actually 42 (and (and (eq_attr “type” “dmul”) ;; Inconsistent attr naming (eq_attr “fp_type” “fp_maddsub_d”)) (eq_attr “cpu” “ppc405”)) “Xfpu_issue2,Xfpu_mul,nothing7,Xfpu_addsub”)
(define_insn_reservation “fp-load” 10 ;; FIXME. Is double/single precision the same ? (and (eq_attr “type” “fpload”) (eq_attr “cpu” “ppc405”)) “Xfpu_issue*10”)
(define_insn_reservation “fp-store” 4 (and (eq_attr “type” “fpstore”) (eq_attr “cpu” “ppc405”)) “Xfpu_issue*4”)
(define_insn_reservation “fp-sqrt-s” 24 ;; Actually 56 (and (eq_attr “type” “ssqrt”) (eq_attr “cpu” “ppc405”)) “Xfpu_issue2,Xfpu_sqrt10”) ;; Unpipelined
(define_insn_reservation “fp-sqrt-d” 34 ;; Actually 116 (and (eq_attr “type” “dsqrt”) (eq_attr “cpu” “ppc405”)) “Xfpu_issue2,Xfpu_sqrt10”) ;; Unpipelined