[MIPS,LS3A] Add the pipeline description for Loongson3A

Index: config/mips/loongson3a.md
===================================================================
--- config/mips/loongson3a.md	(revision 0)
+++ config/mips/loongson3a.md	(revision 0)
@@ -0,0 +1,137 @@ 
+;; Pipeline model for Loongson-3A cores.
+
+;; Copyright (C) 2011 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/>.
+
+;; Uncomment the following line to output automata for debugging.
+;; (automata_option "v")
+
+;; Automaton for integer instructions.
+(define_automaton "ls3a_a_alu")
+
+;; Automaton for floating-point instructions.
+(define_automaton "ls3a_a_falu")
+
+;; Automaton for memory operations.
+(define_automaton "ls3a_a_mem")
+
+;; Describe the resources.
+
+(define_cpu_unit "ls3a_alu1" "ls3a_a_alu")
+(define_cpu_unit "ls3a_alu2" "ls3a_a_alu")
+(define_cpu_unit "ls3a_mem" "ls3a_a_mem")
+(define_cpu_unit "ls3a_falu1" "ls3a_a_falu")
+(define_cpu_unit "ls3a_falu2" "ls3a_a_falu")
+
+;; Describe instruction reservations.
+
+(define_insn_reservation "ls3a_arith" 1
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "arith,clz,const,logical,
+                        move,nop,shift,signext,slt"))
+  "ls3a_alu1 | ls3a_alu2")
+
+(define_insn_reservation "ls3a_branch" 1
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "branch,jump,call,condmove,trap"))
+  "ls3a_alu1")
+
+(define_insn_reservation "ls3a_mfhilo" 1
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "mfhilo,mthilo"))
+  "ls3a_alu2")
+
+;; Operation imul3nc is fully pipelined.
+(define_insn_reservation "ls3a_imul3nc" 5
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "imul3nc"))
+  "ls3a_alu2")
+ 
+(define_insn_reservation "ls3a_imul" 7
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "imul,imadd"))
+  "ls3a_alu2 * 7")
+ 
+(define_insn_reservation "ls3a_idiv_si" 12
+  (and (eq_attr "cpu" "loongson_3a")
+       (and (eq_attr "type" "idiv")
+            (eq_attr "mode" "SI")))
+  "ls3a_alu2 * 12")
+
+(define_insn_reservation "ls3a_idiv_di" 25
+  (and (eq_attr "cpu" "loongson_3a")
+       (and (eq_attr "type" "idiv")
+            (eq_attr "mode" "DI")))
+  "ls3a_alu2 * 25")
+
+(define_insn_reservation "ls3a_load" 3
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "load"))
+  "ls3a_mem")
+ 
+(define_insn_reservation "ls3a_fpload" 4
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "load,mfc,mtc"))
+  "ls3a_mem")
+
+(define_insn_reservation "ls3a_prefetch" 0
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "prefetch,prefetchx"))
+  "ls3a_mem")
+ 
+(define_insn_reservation "ls3a_store" 0
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "store,fpstore,fpidxstore"))
+  "ls3a_mem")
+
+;; All the fp operations can be executed in FAUL1.  Only fp add,
+;; sub, mul, madd can be executed in FAUL2.  Try FAUL2 firstly.
+(define_insn_reservation "ls3a_fadd" 6
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "fadd,fmul,fmadd"))
+  "ls3a_falu2 | ls3a_falu1")
+
+(define_insn_reservation "ls3a_fcmp" 2
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "fabs,fcmp,fmove,fneg"))
+  "ls3a_falu1")
+
+(define_insn_reservation "ls3a_fcvt" 4
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "fcvt"))
+  "ls3a_falu1")
+
+(define_insn_reservation "ls3a_fdiv_sf" 12
+  (and (eq_attr "cpu" "loongson_3a")
+       (and (eq_attr "type" "fdiv,frdiv,fsqrt,frsqrt")
+            (eq_attr "mode" "SF")))
+  "ls3a_falu1 * 12")
+ 
+(define_insn_reservation "ls3a_fdiv_df" 19
+  (and (eq_attr "cpu" "loongson_3a")
+       (and (eq_attr "type" "fdiv,frdiv,fsqrt,frsqrt")
+            (eq_attr "mode" "DF")))
+  "ls3a_falu1 * 19")
+
+;; Force single-dispatch for unknown or multi.
+(define_insn_reservation "ls3a_unknown" 1
+  (and (eq_attr "cpu" "loongson_3a")
+       (eq_attr "type" "unknown,multi"))
+  "ls3a_alu1 + ls3a_alu2 + ls3a_falu1 + ls3a_falu2 + ls3a_mem")
+
+;; End of DFA-based pipeline description for loongson_3a
Index: config/mips/mips.md
===================================================================
--- config/mips/mips.md	(revision 168079)
+++ config/mips/mips.md	(working copy)
@@ -908,6 +908,7 @@ 
 (include "9000.md")
 (include "10000.md")
 (include "loongson2ef.md")
+(include "loongson3a.md")
 (include "octeon.md")
 (include "sb1.md")
 (include "sr71k.md")
Index: config/mips/mips.c
===================================================================
--- config/mips/mips.c	(revision 168079)
+++ config/mips/mips.c	(working copy)
@@ -12154,7 +12154,7 @@  mips_multipass_dfa_lookahead (void)
   if (TUNE_SB1)
     return 4;
 
-  if (TUNE_LOONGSON_2EF)
+  if (TUNE_LOONGSON_2EF || TUNE_LOONGSON_3A)
     return 4;
 
   if (TUNE_OCTEON)