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;; Scheduling description for UltraSPARC-I/II.
;; Copyright (C) 2002, 2004, 2007 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/>.
;; UltraSPARC-I and II are quad-issue processors. Interesting features
;; to note:
;;
;; - Buffered loads, they can queue waiting for the actual data until
;; an instruction actually tries to reference the destination register
;; as an input
;; - Two integer units. Only one of them can do shifts, and the other
;; is the only one which may do condition code setting instructions.
;; Complicating things further, a shift may go only into the first
;; slot in a dispatched group. And if you have a non-condition code
;; setting instruction and one that does set the condition codes. The
;; former must be issued first in order for both of them to issue.
;; - Stores can issue before the value being stored is available. As long
;; as the input data becomes ready before the store is to move out of the
;; store buffer, it will not cause a stall.
;; - Branches may issue in the same cycle as an instruction setting the
;; condition codes being tested by that branch. This does not apply
;; to floating point, only integer.
(define_automaton "ultrasparc_0,ultrasparc_1")
(define_cpu_unit "us1_fdivider,us1_fpm" "ultrasparc_0");
(define_cpu_unit "us1_fpa,us1_load_writeback" "ultrasparc_1")
(define_cpu_unit "us1_fps_0,us1_fps_1,us1_fpd_0,us1_fpd_1" "ultrasparc_1")
(define_cpu_unit "us1_slot0,us1_slot1,us1_slot2,us1_slot3" "ultrasparc_1")
(define_cpu_unit "us1_ieu0,us1_ieu1,us1_cti,us1_lsu" "ultrasparc_1")
(define_reservation "us1_slot012" "(us1_slot0 | us1_slot1 | us1_slot2)")
(define_reservation "us1_slotany" "(us1_slot0 | us1_slot1 | us1_slot2 | us1_slot3)")
(define_reservation "us1_single_issue" "us1_slot0 + us1_slot1 + us1_slot2 + us1_slot3")
(define_reservation "us1_fp_single" "(us1_fps_0 | us1_fps_1)")
(define_reservation "us1_fp_double" "(us1_fpd_0 | us1_fpd_1)")
;; This is a simplified representation of the issue at hand.
;; For most cases, going from one FP precision type insn to another
;; just breaks up the insn group. However for some cases, such
;; a situation causes the second insn to stall 2 more cycles.
(exclusion_set "us1_fps_0,us1_fps_1" "us1_fpd_0,us1_fpd_1")
;; If we have to schedule an ieu1 specific instruction and we want
;; to reserve the ieu0 unit as well, we must reserve it first. So for
;; example we could not schedule this sequence:
;; COMPARE IEU1
;; IALU IEU0
;; but we could schedule them together like this:
;; IALU IEU0
;; COMPARE IEU1
;; This basically requires that ieu0 is reserved before ieu1 when
;; it is required that both be reserved.
(absence_set "us1_ieu0" "us1_ieu1")
;; This defines the slotting order. Most IEU instructions can only
;; execute in the first three slots, FPU and branches can go into
;; any slot. We represent instructions which "break the group"
;; as requiring reservation of us1_slot0.
(absence_set "us1_slot0" "us1_slot1,us1_slot2,us1_slot3")
(absence_set "us1_slot1" "us1_slot2,us1_slot3")
(absence_set "us1_slot2" "us1_slot3")
(define_insn_reservation "us1_single" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "multi,savew,flushw,iflush,trap"))
"us1_single_issue")
(define_insn_reservation "us1_simple_ieuN" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "ialu"))
"(us1_ieu0 | us1_ieu1) + us1_slot012")
(define_insn_reservation "us1_simple_ieu0" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "shift"))
"us1_ieu0 + us1_slot012")
(define_insn_reservation "us1_simple_ieu1" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "compare"))
"us1_ieu1 + us1_slot012")
(define_insn_reservation "us1_ialuX" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "ialuX"))
"us1_single_issue")
(define_insn_reservation "us1_cmove" 2
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "cmove"))
"us1_single_issue, nothing")
(define_insn_reservation "us1_imul" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "imul"))
"us1_single_issue")
(define_insn_reservation "us1_idiv" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "idiv"))
"us1_single_issue")
;; For loads, the "delayed return mode" behavior of the chip
;; is represented using the us1_load_writeback resource.
(define_insn_reservation "us1_load" 2
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "load,fpload"))
"us1_lsu + us1_slot012, us1_load_writeback")
(define_insn_reservation "us1_load_signed" 3
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "sload"))
"us1_lsu + us1_slot012, nothing, us1_load_writeback")
(define_insn_reservation "us1_store" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "store,fpstore"))
"us1_lsu + us1_slot012")
(define_insn_reservation "us1_branch" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "branch"))
"us1_cti + us1_slotany")
(define_insn_reservation "us1_call_jmpl" 1
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "call,sibcall,call_no_delay_slot,uncond_branch"))
"us1_cti + us1_ieu1 + us1_slot0")
(define_insn_reservation "us1_fmov_single" 1
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpmove"))
(eq_attr "fptype" "single"))
"us1_fpa + us1_fp_single + us1_slotany")
(define_insn_reservation "us1_fmov_double" 1
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpmove"))
(eq_attr "fptype" "double"))
"us1_fpa + us1_fp_double + us1_slotany")
(define_insn_reservation "us1_fcmov_single" 2
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpcmove,fpcrmove"))
(eq_attr "fptype" "single"))
"us1_fpa + us1_fp_single + us1_slotany, nothing")
(define_insn_reservation "us1_fcmov_double" 2
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpcmove,fpcrmove"))
(eq_attr "fptype" "double"))
"us1_fpa + us1_fp_double + us1_slotany, nothing")
(define_insn_reservation "us1_faddsub_single" 4
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fp"))
(eq_attr "fptype" "single"))
"us1_fpa + us1_fp_single + us1_slotany, nothing*3")
(define_insn_reservation "us1_faddsub_double" 4
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fp"))
(eq_attr "fptype" "double"))
"us1_fpa + us1_fp_double + us1_slotany, nothing*3")
(define_insn_reservation "us1_fpcmp_single" 1
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpcmp"))
(eq_attr "fptype" "single"))
"us1_fpa + us1_fp_single + us1_slotany")
(define_insn_reservation "us1_fpcmp_double" 1
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpcmp"))
(eq_attr "fptype" "double"))
"us1_fpa + us1_fp_double + us1_slotany")
(define_insn_reservation "us1_fmult_single" 4
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpmul"))
(eq_attr "fptype" "single"))
"us1_fpm + us1_fp_single + us1_slotany, nothing*3")
(define_insn_reservation "us1_fmult_double" 4
(and (and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpmul"))
(eq_attr "fptype" "double"))
"us1_fpm + us1_fp_double + us1_slotany, nothing*3")
;; This is actually in theory dangerous, because it is possible
;; for the chip to prematurely dispatch the dependent instruction
;; in the G stage, resulting in a 9 cycle stall. However I have never
;; been able to trigger this case myself even with hand written code,
;; so it must require some rare complicated pipeline state.
(define_bypass 3
"us1_faddsub_single,us1_faddsub_double,us1_fmult_single,us1_fmult_double"
"us1_faddsub_single,us1_faddsub_double,us1_fmult_single,us1_fmult_double")
;; Floating point divide and square root use the multiplier unit
;; for final rounding 3 cycles before the divide/sqrt is complete.
(define_insn_reservation "us1_fdivs"
13
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpdivs,fpsqrts"))
"(us1_fpm + us1_fdivider + us1_slot0), us1_fdivider*8, (us1_fpm + us1_fdivider), us1_fdivider*2"
)
(define_bypass
12
"us1_fdivs"
"us1_faddsub_single,us1_faddsub_double,us1_fmult_single,us1_fmult_double")
(define_insn_reservation "us1_fdivd"
23
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fpdivd,fpsqrtd"))
"(us1_fpm + us1_fdivider + us1_slot0), us1_fdivider*18, (us1_fpm + us1_fdivider), us1_fdivider*2"
)
(define_bypass
22
"us1_fdivd"
"us1_faddsub_single,us1_faddsub_double,us1_fmult_single,us1_fmult_double")
;; Any store may multi issue with the insn creating the source
;; data as long as that creating insn is not an FPU div/sqrt.
;; We need a special guard function because this bypass does
;; not apply to the address inputs of the store.
(define_bypass 0 "us1_simple_ieuN,us1_simple_ieu1,us1_simple_ieu0,us1_faddsub_single,us1_faddsub_double,us1_fmov_single,us1_fmov_double,us1_fcmov_single,us1_fcmov_double,us1_fmult_single,us1_fmult_double" "us1_store"
"store_data_bypass_p")
;; An integer branch may execute in the same cycle as the compare
;; creating the condition codes.
(define_bypass 0 "us1_simple_ieu1" "us1_branch")
;; VIS scheduling
(define_insn_reservation "us1_fga_single"
2
(and (and
(eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fga"))
(eq_attr "fptype" "single"))
"us1_fpa + us1_fp_single + us1_slotany, nothing")
(define_bypass 1 "us1_fga_single" "us1_fga_single")
(define_insn_reservation "us1_fga_double"
2
(and (and
(eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fga"))
(eq_attr "fptype" "double"))
"us1_fpa + us1_fp_double + us1_slotany, nothing")
(define_bypass 1 "us1_fga_double" "us1_fga_double")
(define_insn_reservation "us1_fgm_single"
4
(and (and
(eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fgm_pack,fgm_mul,fgm_cmp"))
(eq_attr "fptype" "single"))
"us1_fpm + us1_fp_single + us1_slotany, nothing*3")
(define_bypass 3 "us1_fgm_single" "us1_fga_single")
(define_insn_reservation "us1_fgm_double"
4
(and (and
(eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fgm_pack,fgm_mul,fgm_cmp"))
(eq_attr "fptype" "double"))
"us1_fpm + us1_fp_double + us1_slotany, nothing*3")
(define_bypass 3 "us1_fgm_double" "us1_fga_double")
(define_insn_reservation "us1_pdist"
4
(and (eq_attr "cpu" "ultrasparc")
(eq_attr "type" "fgm_pdist"))
"us1_fpm + us1_fp_double + us1_slotany, nothing*3")
(define_bypass 3 "us1_pdist" "us1_fga_double,us1_fga_single")
(define_bypass 1 "us1_pdist" "us1_pdist")
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