Mercurial > hg > CbC > CbC_gcc
annotate gcc/graphite-blocking.c @ 75:3c5ea37d9068
update gcc to gcc-4.6
author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
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date | Mon, 22 Aug 2011 04:01:01 +0900 |
parents | f6334be47118 |
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1 /* Heuristics and transform for loop blocking and strip mining on |
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2 polyhedral representation. |
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3 |
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4 Copyright (C) 2009, 2010 Free Software Foundation, Inc. |
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5 Contributed by Sebastian Pop <sebastian.pop@amd.com> and |
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6 Pranav Garg <pranav.garg2107@gmail.com>. |
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7 |
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8 This file is part of GCC. |
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9 |
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10 GCC is free software; you can redistribute it and/or modify |
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11 it under the terms of the GNU General Public License as published by |
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12 the Free Software Foundation; either version 3, or (at your option) |
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13 any later version. |
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14 |
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15 GCC is distributed in the hope that it will be useful, |
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16 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 GNU General Public License for more details. |
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19 |
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20 You should have received a copy of the GNU General Public License |
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21 along with GCC; see the file COPYING3. If not see |
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22 <http://www.gnu.org/licenses/>. */ |
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23 #include "config.h" |
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24 #include "system.h" |
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25 #include "coretypes.h" |
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26 #include "tree-flow.h" |
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27 #include "tree-dump.h" |
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28 #include "cfgloop.h" |
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29 #include "tree-chrec.h" |
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30 #include "tree-data-ref.h" |
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31 #include "sese.h" |
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32 |
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33 #ifdef HAVE_cloog |
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34 #include "ppl_c.h" |
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35 #include "graphite-ppl.h" |
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36 #include "graphite-poly.h" |
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37 |
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38 |
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39 /* Strip mines with a factor STRIDE the scattering (time) dimension |
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40 around PBB at depth TIME_DEPTH. |
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41 |
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42 The following example comes from the wiki page: |
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43 http://gcc.gnu.org/wiki/Graphite/Strip_mine |
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44 |
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45 The strip mine of a loop with a tile of 64 can be obtained with a |
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46 scattering function as follows: |
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47 |
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48 $ cat ./albert_strip_mine.cloog |
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49 # language: C |
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50 c |
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51 |
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52 # parameter {n | n >= 0} |
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53 1 3 |
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54 # n 1 |
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55 1 1 0 |
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56 1 |
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57 n |
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58 |
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59 1 # Number of statements: |
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60 |
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61 1 |
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62 # {i | 0 <= i <= n} |
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63 2 4 |
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64 # i n 1 |
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65 1 1 0 0 |
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66 1 -1 1 0 |
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67 |
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68 0 0 0 |
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69 1 |
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70 i |
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71 |
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72 1 # Scattering functions |
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73 |
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74 3 6 |
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75 # NEW OLD i n 1 |
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76 1 -64 0 1 0 0 |
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77 1 64 0 -1 0 63 |
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78 0 0 1 -1 0 0 |
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79 |
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80 1 |
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81 NEW OLD |
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82 |
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83 #the output of CLooG is like this: |
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84 #$ cloog ./albert_strip_mine.cloog |
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85 # for (NEW=0;NEW<=floord(n,64);NEW++) { |
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86 # for (OLD=max(64*NEW,0);OLD<=min(64*NEW+63,n);OLD++) { |
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87 # S1(i = OLD) ; |
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88 # } |
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89 # } |
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90 */ |
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91 |
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92 static bool |
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93 pbb_strip_mine_time_depth (poly_bb_p pbb, int time_depth, int stride) |
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94 { |
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95 ppl_dimension_type iter, dim, strip; |
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96 ppl_Polyhedron_t res = PBB_TRANSFORMED_SCATTERING (pbb); |
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97 /* STRIP is the dimension that iterates with stride STRIDE. */ |
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98 /* ITER is the dimension that enumerates single iterations inside |
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99 one strip that has at most STRIDE iterations. */ |
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100 strip = time_depth; |
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101 iter = strip + 2; |
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102 |
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103 psct_add_scattering_dimension (pbb, strip); |
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104 psct_add_scattering_dimension (pbb, strip + 1); |
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105 |
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106 ppl_Polyhedron_space_dimension (res, &dim); |
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107 |
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108 /* Lower bound of the striped loop. */ |
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109 { |
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110 ppl_Constraint_t new_cstr; |
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111 ppl_Linear_Expression_t expr; |
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112 |
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113 ppl_new_Linear_Expression_with_dimension (&expr, dim); |
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114 ppl_set_coef (expr, strip, -1 * stride); |
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115 ppl_set_coef (expr, iter, 1); |
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116 |
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117 ppl_new_Constraint (&new_cstr, expr, PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL); |
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118 ppl_delete_Linear_Expression (expr); |
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119 ppl_Polyhedron_add_constraint (res, new_cstr); |
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120 ppl_delete_Constraint (new_cstr); |
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121 } |
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122 |
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123 /* Upper bound of the striped loop. */ |
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124 { |
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125 ppl_Constraint_t new_cstr; |
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126 ppl_Linear_Expression_t expr; |
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127 |
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128 ppl_new_Linear_Expression_with_dimension (&expr, dim); |
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129 ppl_set_coef (expr, strip, stride); |
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130 ppl_set_coef (expr, iter, -1); |
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131 ppl_set_inhomogeneous (expr, stride - 1); |
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132 |
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133 ppl_new_Constraint (&new_cstr, expr, PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL); |
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134 ppl_delete_Linear_Expression (expr); |
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135 ppl_Polyhedron_add_constraint (res, new_cstr); |
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136 ppl_delete_Constraint (new_cstr); |
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137 } |
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138 |
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139 /* Static scheduling for ITER level. |
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140 This is mandatory to keep the 2d + 1 canonical scheduling format. */ |
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141 { |
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142 ppl_Constraint_t new_cstr; |
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143 ppl_Linear_Expression_t expr; |
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144 |
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145 ppl_new_Linear_Expression_with_dimension (&expr, dim); |
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146 ppl_set_coef (expr, strip + 1, 1); |
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147 ppl_set_inhomogeneous (expr, 0); |
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148 |
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149 ppl_new_Constraint (&new_cstr, expr, PPL_CONSTRAINT_TYPE_EQUAL); |
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150 ppl_delete_Linear_Expression (expr); |
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151 ppl_Polyhedron_add_constraint (res, new_cstr); |
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152 ppl_delete_Constraint (new_cstr); |
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153 } |
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154 |
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155 return true; |
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156 } |
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157 |
67
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158 /* Returns true when strip mining with STRIDE of the loop LST is |
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159 profitable. */ |
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160 |
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161 static bool |
67
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162 lst_strip_mine_profitable_p (lst_p lst, int stride) |
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163 { |
63
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164 mpz_t niter, strip_stride; |
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165 bool res; |
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166 |
67
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167 gcc_assert (LST_LOOP_P (lst)); |
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168 mpz_init (strip_stride); |
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169 mpz_init (niter); |
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170 |
63
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171 mpz_set_si (strip_stride, stride); |
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172 lst_niter_for_loop (lst, niter); |
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173 res = (mpz_cmp (niter, strip_stride) > 0); |
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174 |
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175 mpz_clear (strip_stride); |
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176 mpz_clear (niter); |
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177 return res; |
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178 } |
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179 |
67
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180 /* Strip-mines all the loops of LST with STRIDE. Return true if it |
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181 did strip-mined some loops. */ |
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182 |
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183 static bool |
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184 lst_do_strip_mine_loop (lst_p lst, int depth, int stride) |
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185 { |
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186 int i; |
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187 lst_p l; |
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188 poly_bb_p pbb; |
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189 |
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190 if (!lst) |
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191 return false; |
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192 |
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193 if (LST_LOOP_P (lst)) |
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194 { |
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195 bool res = false; |
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196 |
67
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197 FOR_EACH_VEC_ELT (lst_p, LST_SEQ (lst), i, l) |
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198 res |= lst_do_strip_mine_loop (l, depth, stride); |
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199 |
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200 return res; |
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201 } |
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202 |
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203 pbb = LST_PBB (lst); |
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204 return pbb_strip_mine_time_depth (pbb, psct_dynamic_dim (pbb, depth), |
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205 stride); |
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206 } |
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207 |
67
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208 /* Strip-mines all the loops of LST with STRIDE. When STRIDE is zero, |
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209 read the stride from the PARAM_LOOP_BLOCK_TILE_SIZE. Return true |
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210 if it did strip-mined some loops. |
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211 |
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212 Strip mining transforms a loop |
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213 |
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214 | for (i = 0; i < N; i++) |
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215 | S (i); |
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216 |
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217 into the following loop nest: |
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218 |
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219 | for (k = 0; k < N; k += STRIDE) |
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220 | for (j = 0; j < STRIDE; j++) |
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221 | S (i = k + j); |
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222 */ |
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223 |
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224 static bool |
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225 lst_do_strip_mine (lst_p lst, int stride) |
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226 { |
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227 int i; |
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228 lst_p l; |
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229 bool res = false; |
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230 int depth; |
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231 |
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232 if (!stride) |
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233 stride = PARAM_VALUE (PARAM_LOOP_BLOCK_TILE_SIZE); |
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234 |
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235 if (!lst |
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236 || !LST_LOOP_P (lst)) |
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237 return false; |
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238 |
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239 FOR_EACH_VEC_ELT (lst_p, LST_SEQ (lst), i, l) |
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240 res |= lst_do_strip_mine (l, stride); |
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241 |
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242 depth = lst_depth (lst); |
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243 if (depth >= 0 |
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244 && lst_strip_mine_profitable_p (lst, stride)) |
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245 { |
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246 res |= lst_do_strip_mine_loop (lst, lst_depth (lst), stride); |
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247 lst_add_loop_under_loop (lst); |
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248 } |
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249 |
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250 return res; |
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251 } |
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252 |
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253 /* Strip mines all the loops in SCOP. Returns true when some loops |
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254 have been strip-mined. */ |
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255 |
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256 bool |
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257 scop_do_strip_mine (scop_p scop, int stride) |
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258 { |
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259 return lst_do_strip_mine (SCOP_TRANSFORMED_SCHEDULE (scop), stride); |
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260 } |
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261 |
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262 /* Loop blocks all the loops in SCOP. Returns true when we manage to |
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263 block some loops. */ |
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264 |
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265 bool |
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266 scop_do_block (scop_p scop) |
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267 { |
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268 bool strip_mined = false; |
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269 bool interchanged = false; |
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270 |
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271 store_scattering (scop); |
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272 |
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273 strip_mined = lst_do_strip_mine (SCOP_TRANSFORMED_SCHEDULE (scop), 0); |
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274 interchanged = scop_do_interchange (scop); |
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275 |
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276 /* If we don't interchange loops, the strip mine alone will not be |
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277 profitable, and the transform is not a loop blocking: so revert |
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278 the transform. */ |
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279 if (!interchanged) |
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280 { |
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281 restore_scattering (scop); |
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282 return false; |
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283 } |
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284 else if (strip_mined && interchanged |
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285 && dump_file && (dump_flags & TDF_DETAILS)) |
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286 fprintf (dump_file, "SCoP will be loop blocked.\n"); |
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287 |
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288 return strip_mined || interchanged; |
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289 } |
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290 |
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291 #endif |