gcc/config/nds32/nds32-memory-manipulation.c

   1 /* Auxiliary functions for expand movmem, setmem, cmpmem, load_multiple
   2    and store_multiple pattern of Andes NDS32 cpu for GNU compiler
   3    Copyright (C) 2012-2015 Free Software Foundation, Inc.
   4    Contributed by Andes Technology Corporation.
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 3, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GCC; see the file COPYING3.  If not see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 /* ------------------------------------------------------------------------ */
  23
  24 #include "config.h"
  25 #include "system.h"
  26 #include "coretypes.h"
  27 #include "backend.h"
  28 #include "cfghooks.h"
  29 #include "tree.h"
  30 #include "rtl.h"
  31 #include "df.h"
  32 #include "alias.h"
  33 #include "stor-layout.h"
  34 #include "varasm.h"
  35 #include "calls.h"
  36 #include "regs.h"
  37 #include "insn-config.h"        /* Required by recog.h.  */
  38 #include "conditions.h"
  39 #include "output.h"
  40 #include "insn-attr.h"          /* For DFA state_t.  */
  41 #include "insn-codes.h"         /* For CODE_FOR_xxx.  */
  42 #include "reload.h"             /* For push_reload().  */
  43 #include "flags.h"
  44 #include "insn-config.h"
  45 #include "expmed.h"
  46 #include "dojump.h"
  47 #include "explow.h"
  48 #include "emit-rtl.h"
  49 #include "stmt.h"
  50 #include "expr.h"
  51 #include "recog.h"
  52 #include "diagnostic-core.h"
  53 #include "cfgrtl.h"
  54 #include "cfganal.h"
  55 #include "lcm.h"
  56 #include "cfgbuild.h"
  57 #include "cfgcleanup.h"
  58 #include "tm_p.h"
  59 #include "tm-constrs.h"
  60 #include "optabs.h"             /* For GEN_FCN.  */
  61 #include "target.h"
  62 #include "langhooks.h"          /* For add_builtin_function().  */
  63 #include "builtins.h"
  64
  65 /* ------------------------------------------------------------------------ */
  66
  67 /* Functions to expand load_multiple and store_multiple.
  68    They are auxiliary extern functions to help create rtx template.
  69    Check nds32-multiple.md file for the patterns.  */
  70 rtx
  71 nds32_expand_load_multiple (int base_regno, int count,
  72                             rtx base_addr, rtx basemem)
  73 {
  74   int par_index;
  75   int offset;
  76   rtx result;
  77   rtx new_addr, mem, reg;
  78
  79   /* Create the pattern that is presented in nds32-multiple.md.  */
  80
  81   result = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (count));
  82
  83   for (par_index = 0; par_index < count; par_index++)
  84     {
  85       offset   = par_index * 4;
  86       /* 4-byte for loading data to each register.  */
  87       new_addr = plus_constant (Pmode, base_addr, offset);
  88       mem      = adjust_automodify_address_nv (basemem, SImode,
  89                                                new_addr, offset);
  90       reg      = gen_rtx_REG (SImode, base_regno + par_index);
  91
  92       XVECEXP (result, 0, par_index) = gen_rtx_SET (reg, mem);
  93     }
  94
  95   return result;
  96 }
  97
  98 rtx
  99 nds32_expand_store_multiple (int base_regno, int count,
 100                              rtx base_addr, rtx basemem)
 101 {
 102   int par_index;
 103   int offset;
 104   rtx result;
 105   rtx new_addr, mem, reg;
 106
 107   /* Create the pattern that is presented in nds32-multiple.md.  */
 108
 109   result = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (count));
 110
 111   for (par_index = 0; par_index < count; par_index++)
 112     {
 113       offset   = par_index * 4;
 114       /* 4-byte for storing data to memory.  */
 115       new_addr = plus_constant (Pmode, base_addr, offset);
 116       mem      = adjust_automodify_address_nv (basemem, SImode,
 117                                                new_addr, offset);
 118       reg      = gen_rtx_REG (SImode, base_regno + par_index);
 119
 120       XVECEXP (result, 0, par_index) = gen_rtx_SET (mem, reg);
 121     }
 122
 123   return result;
 124 }
 125
 126 /* Function to move block memory content by
 127    using load_multiple and store_multiple.
 128    This is auxiliary extern function to help create rtx template.
 129    Check nds32-multiple.md file for the patterns.  */
 130 int
 131 nds32_expand_movmemqi (rtx dstmem, rtx srcmem, rtx total_bytes, rtx alignment)
 132 {
 133   HOST_WIDE_INT in_words, out_words;
 134   rtx dst_base_reg, src_base_reg;
 135   int maximum_bytes;
 136
 137   /* Because reduced-set regsiters has few registers
 138      (r0~r5, r6~10, r15, r28~r31, where 'r15' and 'r28~r31'
 139       cannot be used for register allocation),
 140      using 8 registers (32 bytes) for moving memory block
 141      may easily consume all of them.
 142      It makes register allocation/spilling hard to work.
 143      So we only allow maximum=4 registers (16 bytes) for
 144      moving memory block under reduced-set registers.  */
 145   if (TARGET_REDUCED_REGS)
 146     maximum_bytes = 16;
 147   else
 148     maximum_bytes = 32;
 149
 150   /* 1. Total_bytes is integer for sure.
 151      2. Alignment is integer for sure.
 152      3. Maximum 4 or 8 registers, 4 * 4 = 16 bytes, 8 * 4 = 32 bytes.
 153      4. Requires (n * 4) block size.
 154      5. Requires 4-byte alignment.  */
 155   if (GET_CODE (total_bytes) != CONST_INT
 156       || GET_CODE (alignment) != CONST_INT
 157       || INTVAL (total_bytes) > maximum_bytes
 158       || INTVAL (total_bytes) & 3
 159       || INTVAL (alignment) & 3)
 160     return 0;
 161
 162   dst_base_reg = copy_to_mode_reg (SImode, XEXP (dstmem, 0));
 163   src_base_reg = copy_to_mode_reg (SImode, XEXP (srcmem, 0));
 164
 165   out_words = in_words = INTVAL (total_bytes) / UNITS_PER_WORD;
 166
 167   emit_insn (nds32_expand_load_multiple (0, in_words, src_base_reg, srcmem));
 168   emit_insn (nds32_expand_store_multiple (0, out_words, dst_base_reg, dstmem));
 169
 170   /* Successfully create patterns, return 1.  */
 171   return 1;
 172 }
 173
 174 /* ------------------------------------------------------------------------ */