gcc/config/nds32/nds32-fp-as-gp.c

   1 /* The fp-as-gp pass of Andes NDS32 cpu for GNU compiler
   2    Copyright (C) 2012-2015 Free Software Foundation, Inc.
   3    Contributed by Andes Technology Corporation.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 /* ------------------------------------------------------------------------ */
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "backend.h"
  27 #include "tree.h"
  28 #include "rtl.h"
  29 #include "df.h"
  30 #include "alias.h"
  31 #include "stor-layout.h"
  32 #include "varasm.h"
  33 #include "calls.h"
  34 #include "regs.h"
  35 #include "insn-config.h"        /* Required by recog.h.  */
  36 #include "conditions.h"
  37 #include "output.h"
  38 #include "insn-attr.h"          /* For DFA state_t.  */
  39 #include "insn-codes.h"         /* For CODE_FOR_xxx.  */
  40 #include "reload.h"             /* For push_reload().  */
  41 #include "flags.h"
  42 #include "insn-config.h"
  43 #include "expmed.h"
  44 #include "dojump.h"
  45 #include "explow.h"
  46 #include "emit-rtl.h"
  47 #include "stmt.h"
  48 #include "expr.h"
  49 #include "recog.h"
  50 #include "diagnostic-core.h"
  51 #include "cfgrtl.h"
  52 #include "cfganal.h"
  53 #include "lcm.h"
  54 #include "cfgbuild.h"
  55 #include "cfgcleanup.h"
  56 #include "tm_p.h"
  57 #include "tm-constrs.h"
  58 #include "optabs.h"             /* For GEN_FCN.  */
  59 #include "target.h"
  60 #include "langhooks.h"          /* For add_builtin_function().  */
  61 #include "builtins.h"
  62
  63 /* ------------------------------------------------------------------------ */
  64
  65 /* Function to determine whether it is worth to do fp_as_gp optimization.
  66    Return 0: It is NOT worth to do fp_as_gp optimization.
  67    Return 1: It is APPROXIMATELY worth to do fp_as_gp optimization.
  68    Note that if it is worth to do fp_as_gp optimization,
  69    we MUST set FP_REGNUM ever live in this function.  */
  70 int
  71 nds32_fp_as_gp_check_available (void)
  72 {
  73   /* By default we return 0.  */
  74   return 0;
  75 }
  76
  77 /* ------------------------------------------------------------------------ */