1 /* 2 * Copyright 2008-2009 Katholieke Universiteit Leuven 3 * Copyright 2010-2011 INRIA Saclay 4 * 5 * Use of this software is governed by the MIT license 6 * 7 * Written by Sven Verdoolaege, K.U.Leuven, Departement 8 * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium 9 * and INRIA Saclay - Ile-de-France, Parc Club Orsay Universite, 10 * ZAC des vignes, 4 rue Jacques Monod, 91893 Orsay, France 11 */ 12 13 #include <isl_map_private.h> 14 #include <isl_space_private.h> 15 #include <isl_dim_map.h> 16 #include <isl_reordering.h> 17 18 struct isl_dim_map_entry { 19 int pos; 20 int sgn; 21 }; 22 23 /* Maps dst positions to src positions */ 24 struct isl_dim_map { 25 unsigned len; 26 struct isl_dim_map_entry m[1]; 27 }; 28 29 __isl_give isl_dim_map *isl_dim_map_alloc(isl_ctx *ctx, unsigned len) 30 { 31 int i; 32 struct isl_dim_map *dim_map; 33 dim_map = isl_alloc(ctx, struct isl_dim_map, 34 sizeof(struct isl_dim_map) + len * sizeof(struct isl_dim_map_entry)); 35 if (!dim_map) 36 return NULL; 37 dim_map->len = 1 + len; 38 dim_map->m[0].pos = 0; 39 dim_map->m[0].sgn = 1; 40 for (i = 0; i < len; ++i) 41 dim_map->m[1 + i].sgn = 0; 42 return dim_map; 43 } 44 45 /* Free "dim_map" and return NULL. 46 */ 47 __isl_null isl_dim_map *isl_dim_map_free(__isl_take isl_dim_map *dim_map) 48 { 49 free(dim_map); 50 return NULL; 51 } 52 53 void isl_dim_map_range(__isl_keep isl_dim_map *dim_map, 54 unsigned dst_pos, int dst_stride, unsigned src_pos, int src_stride, 55 unsigned n, int sign) 56 { 57 int i; 58 59 if (!dim_map) 60 return; 61 62 for (i = 0; i < n; ++i) { 63 unsigned d = 1 + dst_pos + dst_stride * i; 64 unsigned s = 1 + src_pos + src_stride * i; 65 dim_map->m[d].pos = s; 66 dim_map->m[d].sgn = sign; 67 } 68 } 69 70 void isl_dim_map_dim_range(__isl_keep isl_dim_map *dim_map, 71 __isl_keep isl_space *space, enum isl_dim_type type, 72 unsigned first, unsigned n, unsigned dst_pos) 73 { 74 int i; 75 isl_size off; 76 77 off = isl_space_offset(space, type); 78 if (!dim_map || off < 0) 79 return; 80 81 for (i = 0; i < n; ++i) { 82 dim_map->m[1 + dst_pos + i].pos = 1 + off + first + i; 83 dim_map->m[1 + dst_pos + i].sgn = 1; 84 } 85 } 86 87 void isl_dim_map_dim(__isl_keep isl_dim_map *dim_map, 88 __isl_keep isl_space *space, enum isl_dim_type type, unsigned dst_pos) 89 { 90 isl_size dim = isl_space_dim(space, type); 91 92 if (dim < 0) 93 return; 94 isl_dim_map_dim_range(dim_map, space, type, 0, dim, dst_pos); 95 } 96 97 void isl_dim_map_div(__isl_keep isl_dim_map *dim_map, 98 __isl_keep isl_basic_map *bmap, unsigned dst_pos) 99 { 100 int i; 101 unsigned src_pos; 102 103 if (!dim_map || !bmap) 104 return; 105 106 src_pos = isl_basic_map_offset(bmap, isl_dim_div); 107 for (i = 0; i < bmap->n_div; ++i) { 108 dim_map->m[1 + dst_pos + i].pos = src_pos + i; 109 dim_map->m[1 + dst_pos + i].sgn = 1; 110 } 111 } 112 113 void isl_dim_map_dump(struct isl_dim_map *dim_map) 114 { 115 int i; 116 117 for (i = 0; i < dim_map->len; ++i) 118 fprintf(stderr, "%d -> %d * %d; ", i, 119 dim_map->m[i].sgn, dim_map->m[i].pos); 120 fprintf(stderr, "\n"); 121 } 122 123 static void copy_constraint_dim_map(isl_int *dst, isl_int *src, 124 struct isl_dim_map *dim_map) 125 { 126 int i; 127 128 for (i = 0; i < dim_map->len; ++i) { 129 if (dim_map->m[i].sgn == 0) 130 isl_int_set_si(dst[i], 0); 131 else if (dim_map->m[i].sgn > 0) 132 isl_int_set(dst[i], src[dim_map->m[i].pos]); 133 else 134 isl_int_neg(dst[i], src[dim_map->m[i].pos]); 135 } 136 } 137 138 static void copy_div_dim_map(isl_int *dst, isl_int *src, 139 struct isl_dim_map *dim_map) 140 { 141 isl_int_set(dst[0], src[0]); 142 copy_constraint_dim_map(dst+1, src+1, dim_map); 143 } 144 145 __isl_give isl_basic_map *isl_basic_map_add_constraints_dim_map( 146 __isl_take isl_basic_map *dst, __isl_take isl_basic_map *src, 147 __isl_take isl_dim_map *dim_map) 148 { 149 int i; 150 151 if (!src || !dst || !dim_map) 152 goto error; 153 154 for (i = 0; i < src->n_eq; ++i) { 155 int i1 = isl_basic_map_alloc_equality(dst); 156 if (i1 < 0) 157 goto error; 158 copy_constraint_dim_map(dst->eq[i1], src->eq[i], dim_map); 159 } 160 161 for (i = 0; i < src->n_ineq; ++i) { 162 int i1 = isl_basic_map_alloc_inequality(dst); 163 if (i1 < 0) 164 goto error; 165 copy_constraint_dim_map(dst->ineq[i1], src->ineq[i], dim_map); 166 } 167 168 for (i = 0; i < src->n_div; ++i) { 169 int i1 = isl_basic_map_alloc_div(dst); 170 if (i1 < 0) 171 goto error; 172 copy_div_dim_map(dst->div[i1], src->div[i], dim_map); 173 } 174 175 isl_dim_map_free(dim_map); 176 isl_basic_map_free(src); 177 178 return dst; 179 error: 180 isl_dim_map_free(dim_map); 181 isl_basic_map_free(src); 182 isl_basic_map_free(dst); 183 return NULL; 184 } 185 186 __isl_give isl_basic_set *isl_basic_set_add_constraints_dim_map( 187 __isl_take isl_basic_set *dst, __isl_take isl_basic_set *src, 188 __isl_take isl_dim_map *dim_map) 189 { 190 return isl_basic_map_add_constraints_dim_map(dst, src, dim_map); 191 } 192 193 /* Extend the given dim_map with mappings for the divs in bmap. 194 */ 195 __isl_give isl_dim_map *isl_dim_map_extend(__isl_keep isl_dim_map *dim_map, 196 __isl_keep isl_basic_map *bmap) 197 { 198 int i; 199 struct isl_dim_map *res; 200 int offset; 201 202 if (!dim_map) 203 return NULL; 204 205 offset = isl_basic_map_offset(bmap, isl_dim_div); 206 207 res = isl_dim_map_alloc(bmap->ctx, dim_map->len - 1 + bmap->n_div); 208 if (!res) 209 return NULL; 210 211 for (i = 0; i < dim_map->len; ++i) 212 res->m[i] = dim_map->m[i]; 213 for (i = 0; i < bmap->n_div; ++i) { 214 res->m[dim_map->len + i].pos = offset + i; 215 res->m[dim_map->len + i].sgn = 1; 216 } 217 218 return res; 219 } 220 221 /* Extract a dim_map from a reordering. 222 * We essentially need to reverse the mapping, and add an offset 223 * of 1 for the constant term. 224 */ 225 __isl_give isl_dim_map *isl_dim_map_from_reordering( 226 __isl_keep isl_reordering *exp) 227 { 228 int i; 229 isl_ctx *ctx; 230 isl_size dim; 231 isl_space *space; 232 struct isl_dim_map *dim_map; 233 234 if (!exp) 235 return NULL; 236 237 ctx = isl_reordering_get_ctx(exp); 238 space = isl_reordering_peek_space(exp); 239 dim = isl_space_dim(space, isl_dim_all); 240 if (dim < 0) 241 return NULL; 242 dim_map = isl_dim_map_alloc(ctx, dim); 243 if (!dim_map) 244 return NULL; 245 246 for (i = 0; i < exp->src_len; ++i) { 247 dim_map->m[1 + exp->pos[i]].pos = 1 + i; 248 dim_map->m[1 + exp->pos[i]].sgn = 1; 249 } 250 251 return dim_map; 252 } 253