gcc/config/i386/ppro.md

   1 ;; Pentium Pro/PII Scheduling
   2 ;; Copyright (C) 2002 Free Software Foundation, Inc.
   3 ;;
   4 ;; This file is part of GNU CC.
   5 ;;
   6 ;; GNU CC is free software; you can redistribute it and/or modify
   7 ;; it under the terms of the GNU General Public License as published by
   8 ;; the Free Software Foundation; either version 2, or (at your option)
   9 ;; any later version.
  10 ;;
  11 ;; GNU CC is distributed in the hope that it will be useful,
  12 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 ;; GNU General Public License for more details.
  15 ;;
  16 ;; You should have received a copy of the GNU General Public License
  17 ;; along with GNU CC; see the file COPYING.  If not, write to
  18 ;; the Free Software Foundation, 59 Temple Place - Suite 330,
  19 ;; Boston, MA 02111-1307, USA.  */
  20
  21 ;; Categorize how many uops an ia32 instruction evaluates to:
  22 ;;   one --  an instruction with 1 uop can be decoded by any of the
  23 ;;           three decoders.
  24 ;;   few --  an instruction with 1 to 4 uops can be decoded only by
  25 ;;           decoder 0.
  26 ;;   many -- a complex instruction may take an unspecified number of
  27 ;;           cycles to decode in decoder 0.
  28
  29 (define_attr "ppro_uops" "one,few,many"
  30   (cond [(eq_attr "type" "other,multi,call,callv,fpspc,str")
  31            (const_string "many")
  32          (eq_attr "type" "icmov,fcmov,str,cld")
  33            (const_string "few")
  34          (eq_attr "type" "imov")
  35            (if_then_else (eq_attr "memory" "store,both")
  36              (const_string "few")
  37              (const_string "one"))
  38          (eq_attr "memory" "!none")
  39            (const_string "few")
  40         ]
  41         (const_string "one")))
  42
  43 ;;
  44 ;; The PPro has an out-of-order core, but the instruction decoders are
  45 ;; naturally in-order and asymmetric.  We get best performance by scheduling
  46 ;; for the decoders, for in doing so we give the oo execution unit the
  47 ;; most choices.
  48 ;;
  49 ;; Rough readiness numbers.  Fine tuning happens in i386.c.
  50 ;;
  51 ;; p0   describes port 0.
  52 ;; p01  describes ports 0 and 1 as a pair; alu insns can issue to either.
  53 ;; p2   describes port 2 for loads.
  54 ;; p34  describes ports 3 and 4 for stores.
  55 ;; fpu  describes the fpu accessed via port 0.
  56 ;;      ??? It is less than clear if there are separate fadd and fmul units
  57 ;;      that could operate in parallel.
  58 ;;
  59 ;; ??? fxch isn't handled; not an issue until sched3 after reg-stack is real.
  60
  61 (define_function_unit "ppro_p0" 1 0
  62   (and (eq_attr "cpu" "pentiumpro")
  63        (eq_attr "type" "ishift,rotate,lea,ibr,cld"))
  64   1 1)
  65
  66 (define_function_unit "ppro_p0" 1 0
  67   (and (eq_attr "cpu" "pentiumpro")
  68        (eq_attr "type" "imul"))
  69   4 1)
  70
  71 ;; ??? Does the divider lock out the pipe while it works,
  72 ;; or is there a disconnected unit?
  73 (define_function_unit "ppro_p0" 1 0
  74   (and (eq_attr "cpu" "pentiumpro")
  75        (eq_attr "type" "idiv"))
  76   17 17)
  77
  78 (define_function_unit "ppro_p0" 1 0
  79   (and (eq_attr "cpu" "pentiumpro")
  80        (eq_attr "type" "fop,fsgn,fistp"))
  81   3 1)
  82
  83 (define_function_unit "ppro_p0" 1 0
  84   (and (eq_attr "cpu" "pentiumpro")
  85        (eq_attr "type" "fcmov"))
  86   2 1)
  87
  88 (define_function_unit "ppro_p0" 1 0
  89   (and (eq_attr "cpu" "pentiumpro")
  90        (eq_attr "type" "fcmp"))
  91   1 1)
  92
  93 (define_function_unit "ppro_p0" 1 0
  94   (and (eq_attr "cpu" "pentiumpro")
  95        (eq_attr "type" "fmov"))
  96   1 1)
  97
  98 (define_function_unit "ppro_p0" 1 0
  99   (and (eq_attr "cpu" "pentiumpro")
 100        (eq_attr "type" "fmul"))
 101   5 1)
 102
 103 (define_function_unit "ppro_p0" 1 0
 104   (and (eq_attr "cpu" "pentiumpro")
 105        (eq_attr "type" "fdiv,fpspc"))
 106   56 1)
 107
 108 (define_function_unit "ppro_p01" 2 0
 109   (and (eq_attr "cpu" "pentiumpro")
 110        (eq_attr "type" "!imov,fmov"))
 111   1 1)
 112
 113 (define_function_unit "ppro_p01" 2 0
 114   (and (and (eq_attr "cpu" "pentiumpro")
 115             (eq_attr "type" "imov,fmov"))
 116        (eq_attr "memory" "none"))
 117   1 1)
 118
 119 (define_function_unit "ppro_p2" 1 0
 120   (and (eq_attr "cpu" "pentiumpro")
 121        (ior (eq_attr "type" "pop")
 122             (eq_attr "memory" "load,both")))
 123   3 1)
 124
 125 (define_function_unit "ppro_p34" 1 0
 126   (and (eq_attr "cpu" "pentiumpro")
 127        (ior (eq_attr "type" "push")
 128             (eq_attr "memory" "store,both")))
 129   1 1)
 130
 131 (define_function_unit "fpu" 1 0
 132   (and (eq_attr "cpu" "pentiumpro")
 133        (eq_attr "type" "fop,fsgn,fmov,fcmp,fcmov,fistp"))
 134   1 1)
 135
 136 (define_function_unit "fpu" 1 0
 137   (and (eq_attr "cpu" "pentiumpro")
 138        (eq_attr "type" "fmul"))
 139   5 2)
 140
 141 (define_function_unit "fpu" 1 0
 142   (and (eq_attr "cpu" "pentiumpro")
 143        (eq_attr "type" "fdiv,fpspc"))
 144   56 56)
 145
 146 ;; imul uses the fpu.  ??? does it have the same throughput as fmul?
 147 (define_function_unit "fpu" 1 0
 148   (and (eq_attr "cpu" "pentiumpro")
 149        (eq_attr "type" "imul"))
 150   4 1)