;; Scheduling description for Alpha EV5. ;; Copyright (C) 2002-2021 Free Software Foundation, Inc. ;; ;; 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/.
;; EV5 has two asymmetric integer units, E0 and E1, plus separate ;; FP add and multiply units.
(define_automaton “ev5_0,ev5_1”) (define_cpu_unit “ev5_e0,ev5_e1,ev5_fa,ev5_fm” “ev5_0”) (define_reservation “ev5_e01” “ev5_e0|ev5_e1”) (define_reservation “ev5_fam” “ev5_fa|ev5_fm”) (define_cpu_unit “ev5_imul” “ev5_0”) (define_cpu_unit “ev5_fdiv” “ev5_1”)
; Assume type “multi” single issues. (define_insn_reservation “ev5_multi” 1 (and (eq_attr “tune” “ev5”) (eq_attr “type” “multi”)) “ev5_e0+ev5_e1+ev5_fa+ev5_fm”)
; Stores can only issue to E0, and may not issue with loads. ; Model this with some fake units.
(define_cpu_unit “ev5_l0,ev5_l1,ev5_st” “ev5_0”) (define_reservation “ev5_ld” “ev5_l0|ev5_l1”) (exclusion_set “ev5_l0,ev5_l1” “ev5_st”)
(define_insn_reservation “ev5_st” 1 (and (eq_attr “tune” “ev5”) (eq_attr “type” “ist,fst,st_c,mb”)) “ev5_e0+ev5_st”)
; Loads from L0 complete in two cycles. adjust_cost still factors ; in user-specified memory latency, so return 1 here. (define_insn_reservation “ev5_ld” 1 (and (eq_attr “tune” “ev5”) (eq_attr “type” “ild,fld,ldsym”)) “ev5_e01+ev5_ld”)
(define_insn_reservation “ev5_ld_l” 1 (and (eq_attr “tune” “ev5”) (eq_attr “type” “ld_l”)) “ev5_e0+ev5_ld”)
; Integer branches slot only to E1. (define_insn_reservation “ev5_ibr” 1 (and (eq_attr “tune” “ev5”) (eq_attr “type” “ibr”)) “ev5_e1”)
(define_insn_reservation “ev5_callpal” 1 (and (eq_attr “tune” “ev5”) (eq_attr “type” “callpal”)) “ev5_e1”)
(define_insn_reservation “ev5_jsr” 1 (and (eq_attr “tune” “ev5”) (eq_attr “type” “jsr”)) “ev5_e1”)
(define_insn_reservation “ev5_shift” 1 (and (eq_attr “tune” “ev5”) (eq_attr “type” “shift”)) “ev5_e0”)
(define_insn_reservation “ev5_mvi” 2 (and (eq_attr “tune” “ev5”) (eq_attr “type” “mvi”)) “ev5_e0”)
(define_insn_reservation “ev5_cmov” 2 (and (eq_attr “tune” “ev5”) (eq_attr “type” “icmov”)) “ev5_e01”)
(define_insn_reservation “ev5_iadd” 1 (and (eq_attr “tune” “ev5”) (eq_attr “type” “iadd”)) “ev5_e01”)
(define_insn_reservation “ev5_ilogcmp” 1 (and (eq_attr “tune” “ev5”) (eq_attr “type” “ilog,icmp”)) “ev5_e01”)
; Conditional move and branch can issue the same cycle as the test. (define_bypass 0 “ev5_ilogcmp” “ev5_ibr,ev5_cmov” “if_test_bypass_p”)
; Multiplies use a non-pipelined imul unit. Also, “no insn can be issued ; to E0 exactly two cycles before an integer multiply completes”.
(define_insn_reservation “ev5_imull” 8 (and (eq_attr “tune” “ev5”) (and (eq_attr “type” “imul”) (eq_attr “opsize” “si”))) “ev5_e0+ev5_imul,ev5_imul*3,nothing,ev5_e0”)
(define_insn_reservation “ev5_imulq” 12 (and (eq_attr “tune” “ev5”) (and (eq_attr “type” “imul”) (eq_attr “opsize” “di”))) “ev5_e0+ev5_imul,ev5_imul*7,nothing,ev5_e0”)
(define_insn_reservation “ev5_imulh” 14 (and (eq_attr “tune” “ev5”) (and (eq_attr “type” “imul”) (eq_attr “opsize” “udi”))) “ev5_e0+ev5_imul,ev5_imul7,nothing3,ev5_e0”)
; The multiplier is unable to receive data from Ebox bypass paths. The ; instruction issues at the expected time, but its latency is increased ; by the time it takes for the input data to become available to the ; multiplier. For example, an IMULL instruction issued one cycle later ; than an ADDL instruction, which produced one of its operands, has a ; latency of 10 (8 + 2). If the IMULL instruction is issued two cycles ; later than the ADDL instruction, the latency is 9 (8 + 1). ; ; Model this instead with increased latency on the input instruction.
(define_bypass 3 “ev5_ld,ev5_ld_l,ev5_shift,ev5_mvi,ev5_cmov,ev5_iadd,ev5_ilogcmp” “ev5_imull,ev5_imulq,ev5_imulh”)
(define_bypass 9 “ev5_imull” “ev5_imull,ev5_imulq,ev5_imulh”) (define_bypass 13 “ev5_imulq” “ev5_imull,ev5_imulq,ev5_imulh”) (define_bypass 15 “ev5_imulh” “ev5_imull,ev5_imulq,ev5_imulh”)
; Similarly for the FPU we have two asymmetric units.
(define_insn_reservation “ev5_fadd” 4 (and (eq_attr “tune” “ev5”) (eq_attr “type” “fadd,fcmov”)) “ev5_fa”)
(define_insn_reservation “ev5_fbr” 1 (and (eq_attr “tune” “ev5”) (eq_attr “type” “fbr”)) “ev5_fa”)
(define_insn_reservation “ev5_fcpys” 4 (and (eq_attr “tune” “ev5”) (eq_attr “type” “fcpys”)) “ev5_fam”)
(define_insn_reservation “ev5_fmul” 4 (and (eq_attr “tune” “ev5”) (eq_attr “type” “fmul”)) “ev5_fm”)
; The floating point divider is not pipelined. Also, “no insn can be issued ; to FA exactly five before an fdiv insn completes”. ; ; ??? Do not model this late reservation due to the enormously increased ; size of the resulting DFA. ; ; ??? Putting ev5_fa and ev5_fdiv alone into the same automata produces ; a DFA of acceptable size, but putting ev5_fm and ev5_fa into separate ; automata produces incorrect results for insns that can choose one or ; the other, i.e. ev5_fcpys.
(define_insn_reservation “ev5_fdivsf” 15 (and (eq_attr “tune” “ev5”) (and (eq_attr “type” “fdiv”) (eq_attr “opsize” “si”))) ; “ev5_fa+ev5_fdiv,ev5_fdiv9,ev5_fa+ev5_fdiv,ev5_fdiv4” “ev5_fa+ev5_fdiv,ev5_fdiv*14”)
(define_insn_reservation “ev5_fdivdf” 22 (and (eq_attr “tune” “ev5”) (and (eq_attr “type” “fdiv”) (eq_attr “opsize” “di”))) ; “ev5_fa+ev5_fdiv,ev5_fdiv17,ev5_fa+ev5_fdiv,ev5_fdiv4” “ev5_fa+ev5_fdiv,ev5_fdiv*21”)
; Traps don't consume or produce data; rpcc is latency 2 if we ever add it. (define_insn_reservation “ev5_misc” 2 (and (eq_attr “tune” “ev5”) (eq_attr “type” “misc”)) “ev5_e0”)