1 //===- GmpConv.cpp - Recreate LLVM IR from the Scop. ---------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // Functions for converting between gmp objects and llvm::APInt. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "polly/Support/GICHelper.h" 14 #include "llvm/ADT/APInt.h" 15 #include "isl/val.h" 16 17 using namespace llvm; 18 19 __isl_give isl_val *polly::isl_valFromAPInt(isl_ctx *Ctx, const APInt Int, 20 bool IsSigned) { 21 APInt Abs; 22 isl_val *v; 23 24 // As isl is interpreting the input always as unsigned value, we need some 25 // additional pre and post processing to import signed values. The approach 26 // we take is to first obtain the absolute value of Int and then negate the 27 // value after it has been imported to isl. 28 // 29 // It should be noted that the smallest integer value represented in two's 30 // complement with a certain amount of bits does not have a corresponding 31 // positive representation in two's complement representation with the same 32 // number of bits. E.g. 110 (-2) does not have a corresponding value for (2). 33 // To ensure that there is always a corresponding value available we first 34 // sign-extend the input by one bit and only then take the absolute value. 35 if (IsSigned) 36 Abs = Int.sext(Int.getBitWidth() + 1).abs(); 37 else 38 Abs = Int; 39 40 const uint64_t *Data = Abs.getRawData(); 41 unsigned Words = Abs.getNumWords(); 42 43 v = isl_val_int_from_chunks(Ctx, Words, sizeof(uint64_t), Data); 44 45 if (IsSigned && Int.isNegative()) 46 v = isl_val_neg(v); 47 48 return v; 49 } 50 51 APInt polly::APIntFromVal(__isl_take isl_val *Val) { 52 uint64_t *Data; 53 int NumChunks; 54 const static int ChunkSize = sizeof(uint64_t); 55 56 assert(isl_val_is_int(Val) && "Only integers can be converted to APInt"); 57 58 NumChunks = isl_val_n_abs_num_chunks(Val, ChunkSize); 59 Data = (uint64_t *)malloc(NumChunks * ChunkSize); 60 isl_val_get_abs_num_chunks(Val, ChunkSize, Data); 61 int NumBits = CHAR_BIT * ChunkSize * NumChunks; 62 APInt A(NumBits, NumChunks, Data); 63 64 // As isl provides only an interface to obtain data that describes the 65 // absolute value of an isl_val, A at this point always contains a positive 66 // number. In case Val was originally negative, we expand the size of A by 67 // one and negate the value (in two's complement representation). As a result, 68 // the new value in A corresponds now with Val. 69 if (isl_val_is_neg(Val)) { 70 A = A.zext(A.getBitWidth() + 1); 71 A = -A; 72 } 73 74 // isl may represent small numbers with more than the minimal number of bits. 75 // We truncate the APInt to the minimal number of bits needed to represent the 76 // signed value it contains, to ensure that the bitwidth is always minimal. 77 if (A.getMinSignedBits() < A.getBitWidth()) 78 A = A.trunc(A.getMinSignedBits()); 79 80 free(Data); 81 isl_val_free(Val); 82 return A; 83 } 84 85 template <typename ISLTy, typename ISL_CTX_GETTER, typename ISL_PRINTER> 86 static inline std::string stringFromIslObjInternal(__isl_keep ISLTy *isl_obj, 87 ISL_CTX_GETTER ctx_getter_fn, 88 ISL_PRINTER printer_fn, 89 std::string DefaultValue) { 90 if (!isl_obj) 91 return DefaultValue; 92 isl_ctx *ctx = ctx_getter_fn(isl_obj); 93 isl_printer *p = isl_printer_to_str(ctx); 94 p = printer_fn(p, isl_obj); 95 char *char_str = isl_printer_get_str(p); 96 std::string string; 97 if (char_str) 98 string = char_str; 99 else 100 string = DefaultValue; 101 free(char_str); 102 isl_printer_free(p); 103 return string; 104 } 105 106 #define ISL_C_OBJECT_TO_STRING(name) \ 107 std::string polly::stringFromIslObj(__isl_keep isl_##name *Obj, \ 108 std::string DefaultValue) { \ 109 return stringFromIslObjInternal(Obj, isl_##name##_get_ctx, \ 110 isl_printer_print_##name, DefaultValue); \ 111 } 112 113 ISL_C_OBJECT_TO_STRING(aff) 114 ISL_C_OBJECT_TO_STRING(ast_expr) 115 ISL_C_OBJECT_TO_STRING(ast_node) 116 ISL_C_OBJECT_TO_STRING(basic_map) 117 ISL_C_OBJECT_TO_STRING(basic_set) 118 ISL_C_OBJECT_TO_STRING(map) 119 ISL_C_OBJECT_TO_STRING(set) 120 ISL_C_OBJECT_TO_STRING(id) 121 ISL_C_OBJECT_TO_STRING(multi_aff) 122 ISL_C_OBJECT_TO_STRING(multi_pw_aff) 123 ISL_C_OBJECT_TO_STRING(multi_union_pw_aff) 124 ISL_C_OBJECT_TO_STRING(point) 125 ISL_C_OBJECT_TO_STRING(pw_aff) 126 ISL_C_OBJECT_TO_STRING(pw_multi_aff) 127 ISL_C_OBJECT_TO_STRING(schedule) 128 ISL_C_OBJECT_TO_STRING(schedule_node) 129 ISL_C_OBJECT_TO_STRING(space) 130 ISL_C_OBJECT_TO_STRING(union_access_info) 131 ISL_C_OBJECT_TO_STRING(union_flow) 132 ISL_C_OBJECT_TO_STRING(union_set) 133 ISL_C_OBJECT_TO_STRING(union_map) 134 ISL_C_OBJECT_TO_STRING(union_pw_aff) 135 ISL_C_OBJECT_TO_STRING(union_pw_multi_aff) 136 137 static void replace(std::string &str, const std::string &find, 138 const std::string &replace) { 139 size_t pos = 0; 140 while ((pos = str.find(find, pos)) != std::string::npos) { 141 str.replace(pos, find.length(), replace); 142 pos += replace.length(); 143 } 144 } 145 146 static void makeIslCompatible(std::string &str) { 147 replace(str, ".", "_"); 148 replace(str, "\"", "_"); 149 replace(str, " ", "__"); 150 replace(str, "=>", "TO"); 151 replace(str, "+", "_"); 152 } 153 154 std::string polly::getIslCompatibleName(const std::string &Prefix, 155 const std::string &Middle, 156 const std::string &Suffix) { 157 std::string S = Prefix + Middle + Suffix; 158 makeIslCompatible(S); 159 return S; 160 } 161 162 std::string polly::getIslCompatibleName(const std::string &Prefix, 163 const std::string &Name, long Number, 164 const std::string &Suffix, 165 bool UseInstructionNames) { 166 std::string S = Prefix; 167 168 if (UseInstructionNames) 169 S += std::string("_") + Name; 170 else 171 S += std::to_string(Number); 172 173 S += Suffix; 174 175 makeIslCompatible(S); 176 return S; 177 } 178 179 std::string polly::getIslCompatibleName(const std::string &Prefix, 180 const Value *Val, long Number, 181 const std::string &Suffix, 182 bool UseInstructionNames) { 183 std::string ValStr; 184 185 if (UseInstructionNames && Val->hasName()) 186 ValStr = std::string("_") + std::string(Val->getName()); 187 else 188 ValStr = std::to_string(Number); 189 190 return getIslCompatibleName(Prefix, ValStr, Suffix); 191 } 192 193 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) 194 /// To call a inline dump() method in a debugger, at it must have been 195 /// instantiated in at least one translation unit. Because isl's dump() method 196 /// are meant to be called from a debugger only, but not from code, no such 197 /// instantiation would exist. We use this method to force an instantiation in 198 /// this translation unit. Because it has non-static linking, the compiler does 199 /// not know that it is never called, and therefore must ensure the existence of 200 /// the dump functions. 201 void neverCalled() { 202 polly::dumpIslObj(isl::aff()); 203 polly::dumpIslObj(isl::aff_list()); 204 polly::dumpIslObj(isl::ast_expr()); 205 polly::dumpIslObj(isl::ast_node()); 206 polly::dumpIslObj(isl::ast_node_list()); 207 polly::dumpIslObj(isl::basic_map()); 208 polly::dumpIslObj(isl::basic_map_list()); 209 polly::dumpIslObj(isl::basic_set()); 210 polly::dumpIslObj(isl::basic_set_list()); 211 polly::dumpIslObj(isl::constraint()); 212 polly::dumpIslObj(isl::id()); 213 polly::dumpIslObj(isl::id_list()); 214 polly::dumpIslObj(isl::id_to_ast_expr()); 215 polly::dumpIslObj(isl::local_space()); 216 polly::dumpIslObj(isl::map()); 217 polly::dumpIslObj(isl::map_list()); 218 polly::dumpIslObj(isl::multi_aff()); 219 polly::dumpIslObj(isl::multi_pw_aff()); 220 polly::dumpIslObj(isl::multi_union_pw_aff()); 221 polly::dumpIslObj(isl::multi_val()); 222 polly::dumpIslObj(isl::point()); 223 polly::dumpIslObj(isl::pw_aff()); 224 polly::dumpIslObj(isl::pw_aff_list()); 225 polly::dumpIslObj(isl::pw_multi_aff()); 226 polly::dumpIslObj(isl::schedule()); 227 polly::dumpIslObj(isl::schedule_constraints()); 228 polly::dumpIslObj(isl::schedule_node()); 229 polly::dumpIslObj(isl::set()); 230 polly::dumpIslObj(isl::set_list()); 231 polly::dumpIslObj(isl::space()); 232 polly::dumpIslObj(isl::union_map()); 233 polly::dumpIslObj(isl::union_pw_aff()); 234 polly::dumpIslObj(isl::union_pw_aff_list()); 235 polly::dumpIslObj(isl::union_pw_multi_aff()); 236 polly::dumpIslObj(isl::union_set()); 237 polly::dumpIslObj(isl::union_set_list()); 238 polly::dumpIslObj(isl::val()); 239 polly::dumpIslObj(isl::val_list()); 240 } 241 #endif 242