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;; Scheduling description for z900 (cpu 2064).
;; Copyright (C) 2003-2019 Free Software Foundation, Inc.
;; Contributed by Hartmut Penner (hpenner@de.ibm.com) and
;; Ulrich Weigand (uweigand@de.ibm.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/>.
;;
;; References:
;; The microarchitecture of the IBM eServer z900 processor.
;; E.M. Schwarz et al.
;; IBM Journal of Research and Development Vol. 46 No 4/5, 2002.
;;
;; z900 (cpu 2064) pipeline
;;
;; dec
;; --> | <---
;; LA bypass | agen |
;; | | |
;; --- c1 | Load bypass
;; | |
;; c2----
;; |
;; e1
;; |
;; wr
(define_automaton "z_ipu")
(define_cpu_unit "z_e1" "z_ipu")
(define_cpu_unit "z_wr" "z_ipu")
(define_insn_reservation "z_la" 1
(and (eq_attr "cpu" "z900")
(eq_attr "type" "la"))
"z_e1,z_wr")
(define_insn_reservation "z_larl" 1
(and (eq_attr "cpu" "z900")
(eq_attr "type" "larl"))
"z_e1,z_wr")
(define_insn_reservation "z_load" 1
(and (eq_attr "cpu" "z900")
(eq_attr "type" "load"))
"z_e1,z_wr")
(define_insn_reservation "z_store" 1
(and (eq_attr "cpu" "z900")
(eq_attr "type" "store"))
"z_e1,z_wr")
(define_insn_reservation "z_sem" 2
(and (eq_attr "cpu" "z900")
(eq_attr "type" "sem"))
"z_e1*2,z_wr")
(define_insn_reservation "z_call" 5
(and (eq_attr "cpu" "z900")
(eq_attr "type" "jsr"))
"z_e1*5,z_wr")
(define_insn_reservation "z_mul" 5
(and (eq_attr "cpu" "z900")
(eq_attr "type" "imulsi,imulhi"))
"z_e1*5,z_wr")
(define_insn_reservation "z_inf" 10
(and (eq_attr "cpu" "z900")
(eq_attr "type" "idiv,imuldi"))
"z_e1*10,z_wr")
;; For everything else we check the atype flag.
(define_insn_reservation "z_int" 1
(and (eq_attr "cpu" "z900")
(and (not (eq_attr "type" "la,larl,load,store,jsr"))
(eq_attr "atype" "reg")))
"z_e1,z_wr")
(define_insn_reservation "z_agen" 1
(and (eq_attr "cpu" "z900")
(and (not (eq_attr "type" "la,larl,load,store,jsr"))
(eq_attr "atype" "agen")))
"z_e1,z_wr")
;;
;; s390_agen_dep_p returns 1, if a register is set in the
;; first insn and used in the dependent insn to form a address.
;;
;;
;; If an instruction uses a register to address memory, it needs
;; to be set 5 cycles in advance.
;;
(define_bypass 5 "z_int,z_agen"
"z_agen,z_la,z_call,z_load,z_store" "s390_agen_dep_p")
;;
;; A load type instruction uses a bypass to feed the result back
;; to the address generation pipeline stage.
;;
(define_bypass 3 "z_load"
"z_agen,z_la,z_call,z_load,z_store" "s390_agen_dep_p")
;;
;; A load address type instruction uses a bypass to feed the
;; result back to the address generation pipeline stage.
;;
(define_bypass 2 "z_larl,z_la"
"z_agen,z_la,z_call,z_load,z_store" "s390_agen_dep_p")
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