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) 2012-2014 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 "tm.h"
  28 #include "tree.h"
  29 #include "stor-layout.h"
  30 #include "varasm.h"
  31 #include "calls.h"
  32 #include "rtl.h"
  33 #include "regs.h"
  34 #include "hard-reg-set.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 "hashtab.h"
  43 #include "hash-set.h"
  44 #include "vec.h"
  45 #include "machmode.h"
  46 #include "input.h"
  47 #include "function.h"
  48 #include "expr.h"
  49 #include "recog.h"
  50 #include "diagnostic-core.h"
  51 #include "df.h"
  52 #include "tm_p.h"
  53 #include "tm-constrs.h"
  54 #include "optabs.h"             /* For GEN_FCN.  */
  55 #include "target.h"
  56 #include "target-def.h"
  57 #include "langhooks.h"          /* For add_builtin_function().  */
  58 #include "ggc.h"
  59 #include "builtins.h"
  60
  61 /* ------------------------------------------------------------------------ */
  62
  63 /* Functions to expand load_multiple and store_multiple.
  64    They are auxiliary extern functions to help create rtx template.
  65    Check nds32-multiple.md file for the patterns.  */
  66 rtx
  67 nds32_expand_load_multiple (int base_regno, int count,
  68                             rtx base_addr, rtx basemem)
  69 {
  70   int par_index;
  71   int offset;
  72   rtx result;
  73   rtx new_addr, mem, reg;
  74
  75   /* Create the pattern that is presented in nds32-multiple.md.  */
  76
  77   result = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (count));
  78
  79   for (par_index = 0; par_index < count; par_index++)
  80     {
  81       offset   = par_index * 4;
  82       /* 4-byte for loading data to each register.  */
  83       new_addr = plus_constant (Pmode, base_addr, offset);
  84       mem      = adjust_automodify_address_nv (basemem, SImode,
  85                                                new_addr, offset);
  86       reg      = gen_rtx_REG (SImode, base_regno + par_index);
  87
  88       XVECEXP (result, 0, par_index) = gen_rtx_SET (VOIDmode, reg, mem);
  89     }
  90
  91   return result;
  92 }
  93
  94 rtx
  95 nds32_expand_store_multiple (int base_regno, int count,
  96                              rtx base_addr, rtx basemem)
  97 {
  98   int par_index;
  99   int offset;
 100   rtx result;
 101   rtx new_addr, mem, reg;
 102
 103   /* Create the pattern that is presented in nds32-multiple.md.  */
 104
 105   result = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (count));
 106
 107   for (par_index = 0; par_index < count; par_index++)
 108     {
 109       offset   = par_index * 4;
 110       /* 4-byte for storing data to memory.  */
 111       new_addr = plus_constant (Pmode, base_addr, offset);
 112       mem      = adjust_automodify_address_nv (basemem, SImode,
 113                                                new_addr, offset);
 114       reg      = gen_rtx_REG (SImode, base_regno + par_index);
 115
 116       XVECEXP (result, 0, par_index) = gen_rtx_SET (VOIDmode, mem, reg);
 117     }
 118
 119   return result;
 120 }
 121
 122 /* Function to move block memory content by
 123    using load_multiple and store_multiple.
 124    This is auxiliary extern function to help create rtx template.
 125    Check nds32-multiple.md file for the patterns.  */
 126 int
 127 nds32_expand_movmemqi (rtx dstmem, rtx srcmem, rtx total_bytes, rtx alignment)
 128 {
 129   HOST_WIDE_INT in_words, out_words;
 130   rtx dst_base_reg, src_base_reg;
 131   int maximum_bytes;
 132
 133   /* Because reduced-set regsiters has few registers
 134      (r0~r5, r6~10, r15, r28~r31, where 'r15' and 'r28~r31'
 135       cannot be used for register allocation),
 136      using 8 registers (32 bytes) for moving memory block
 137      may easily consume all of them.
 138      It makes register allocation/spilling hard to work.
 139      So we only allow maximum=4 registers (16 bytes) for
 140      moving memory block under reduced-set registers.  */
 141   if (TARGET_REDUCED_REGS)
 142     maximum_bytes = 16;
 143   else
 144     maximum_bytes = 32;
 145
 146   /* 1. Total_bytes is integer for sure.
 147      2. Alignment is integer for sure.
 148      3. Maximum 4 or 8 registers, 4 * 4 = 16 bytes, 8 * 4 = 32 bytes.
 149      4. Requires (n * 4) block size.
 150      5. Requires 4-byte alignment.  */
 151   if (GET_CODE (total_bytes) != CONST_INT
 152       || GET_CODE (alignment) != CONST_INT
 153       || INTVAL (total_bytes) > maximum_bytes
 154       || INTVAL (total_bytes) & 3
 155       || INTVAL (alignment) & 3)
 156     return 0;
 157
 158   dst_base_reg = copy_to_mode_reg (SImode, XEXP (dstmem, 0));
 159   src_base_reg = copy_to_mode_reg (SImode, XEXP (srcmem, 0));
 160
 161   out_words = in_words = INTVAL (total_bytes) / UNITS_PER_WORD;
 162
 163   emit_insn (nds32_expand_load_multiple (0, in_words, src_base_reg, srcmem));
 164   emit_insn (nds32_expand_store_multiple (0, out_words, dst_base_reg, dstmem));
 165
 166   /* Successfully create patterns, return 1.  */
 167   return 1;
 168 }
 169
 170 /* ------------------------------------------------------------------------ */