summaryrefslogtreecommitdiff
path: root/gcc/config/arm/cortex-m4-fpu.md
blob: 6fd5faf74ee6336c7cc865946bf2db5d2bcc14cb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
;; ARM Cortex-M4 FPU pipeline description
;; Copyright (C) 2010 Free Software Foundation, Inc.
;; Contributed by CodeSourcery.
;;
;; 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/>.

;; Use an artifial unit to model FPU.
(define_cpu_unit "cortex_m4_v" "cortex_m4")

(define_reservation "cortex_m4_ex_v" "cortex_m4_ex+cortex_m4_v")

;; Integer instructions following VDIV or VSQRT complete out-of-order.
(define_insn_reservation "cortex_m4_fdivs" 15
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "fdivs"))
  "cortex_m4_ex_v,cortex_m4_v*13")

(define_insn_reservation "cortex_m4_vmov_1" 1
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "fcpys,fconsts"))
  "cortex_m4_ex_v")

(define_insn_reservation "cortex_m4_vmov_2" 2
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "f_2_r,r_2_f"))
  "cortex_m4_ex_v*2")

(define_insn_reservation "cortex_m4_fmuls" 2
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "fmuls"))
  "cortex_m4_ex_v")

(define_insn_reservation "cortex_m4_fmacs" 4
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "fmacs"))
  "cortex_m4_ex_v*3")

(define_insn_reservation "cortex_m4_ffariths" 1
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "ffariths"))
  "cortex_m4_ex_v")

(define_insn_reservation "cortex_m4_fadds" 2
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "fadds"))
  "cortex_m4_ex_v")

(define_insn_reservation "cortex_m4_fcmps" 1
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "fcmps"))
  "cortex_m4_ex_v")

(define_insn_reservation "cortex_m4_f_flag" 1
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "f_flag"))
  "cortex_m4_ex_v")

(define_insn_reservation "cortex_m4_f_cvt" 2
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "f_cvt"))
  "cortex_m4_ex_v")

(define_insn_reservation "cortex_m4_f_load" 2
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "f_loads"))
  "cortex_m4_ex_v*2")

(define_insn_reservation "cortex_m4_f_store" 2
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "f_stores"))
  "cortex_m4_ex_v*2")

(define_insn_reservation "cortex_m4_f_loadd" 3
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "f_loadd"))
  "cortex_m4_ex_v*3")

(define_insn_reservation "cortex_m4_f_stored" 3
  (and (eq_attr "tune" "cortexm4")
       (eq_attr "type" "f_stored"))
  "cortex_m4_ex_v*3")

;; MAC instructions consume their addend one cycle later. If the result
;; of an arithmetic instruction is consumed as the addend of the following
;; MAC instruction, the latency can be decreased by one.

(define_bypass 1 "cortex_m4_fadds,cortex_m4_fmuls,cortex_m4_f_cvt"
		 "cortex_m4_fmacs"
		 "arm_no_early_mul_dep")

(define_bypass 3 "cortex_m4_fmacs"
		 "cortex_m4_fmacs"
		 "arm_no_early_mul_dep")

(define_bypass 14 "cortex_m4_fdivs"
		  "cortex_m4_fmacs"
		  "arm_no_early_mul_dep")