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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 | //===-- InstructionSimplify.h - Fold instrs into simpler forms --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares routines for folding instructions into simpler forms
// that do not require creating new instructions. This does constant folding
// ("add i32 1, 1" -> "2") but can also handle non-constant operands, either
// returning a constant ("and i32 %x, 0" -> "0") or an already existing value
// ("and i32 %x, %x" -> "%x"). If the simplification is also an instruction
// then it dominates the original instruction.
//
// These routines implicitly resolve undef uses. The easiest way to be safe when
// using these routines to obtain simplified values for existing instructions is
// to always replace all uses of the instructions with the resulting simplified
// values. This will prevent other code from seeing the same undef uses and
// resolving them to different values.
//
// These routines are designed to tolerate moderately incomplete IR, such as
// instructions that are not connected to basic blocks yet. However, they do
// require that all the IR that they encounter be valid. In particular, they
// require that all non-constant values be defined in the same function, and the
// same call context of that function (and not split between caller and callee
// contexts of a directly recursive call, for example).
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H
#define LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H
#include "llvm/IR/User.h"
namespace llvm {
template<typename T>
class ArrayRef;
class DominatorTree;
class Instruction;
class DataLayout;
class FastMathFlags;
class TargetLibraryInfo;
class Type;
class Value;
/// SimplifyAddInst - Given operands for an Add, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyAddInst(Value *LHS, Value *RHS, bool isNSW, bool isNUW,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifySubInst - Given operands for a Sub, see if we can
/// fold the result. If not, this returns null.
Value *SimplifySubInst(Value *LHS, Value *RHS, bool isNSW, bool isNUW,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// Given operands for an FAdd, see if we can fold the result. If not, this
/// returns null.
Value *SimplifyFAddInst(Value *LHS, Value *RHS, FastMathFlags FMF,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// Given operands for an FSub, see if we can fold the result. If not, this
/// returns null.
Value *SimplifyFSubInst(Value *LHS, Value *RHS, FastMathFlags FMF,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// Given operands for an FMul, see if we can fold the result. If not, this
/// returns null.
Value *SimplifyFMulInst(Value *LHS, Value *RHS,
FastMathFlags FMF,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyMulInst - Given operands for a Mul, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyMulInst(Value *LHS, Value *RHS, const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifySDivInst - Given operands for an SDiv, see if we can
/// fold the result. If not, this returns null.
Value *SimplifySDivInst(Value *LHS, Value *RHS,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyUDivInst - Given operands for a UDiv, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyUDivInst(Value *LHS, Value *RHS,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyFDivInst - Given operands for an FDiv, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyFDivInst(Value *LHS, Value *RHS,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifySRemInst - Given operands for an SRem, see if we can
/// fold the result. If not, this returns null.
Value *SimplifySRemInst(Value *LHS, Value *RHS,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyURemInst - Given operands for a URem, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyURemInst(Value *LHS, Value *RHS,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyFRemInst - Given operands for an FRem, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyFRemInst(Value *LHS, Value *RHS,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyShlInst - Given operands for a Shl, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyShlInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyLShrInst - Given operands for a LShr, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyLShrInst(Value *Op0, Value *Op1, bool isExact,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyAShrInst - Given operands for a AShr, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyAShrInst(Value *Op0, Value *Op1, bool isExact,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyAndInst - Given operands for an And, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyAndInst(Value *LHS, Value *RHS, const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyOrInst - Given operands for an Or, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyOrInst(Value *LHS, Value *RHS, const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyXorInst - Given operands for a Xor, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyXorInst(Value *LHS, Value *RHS, const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyICmpInst - Given operands for an ICmpInst, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyFCmpInst - Given operands for an FCmpInst, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyFCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifySelectInst - Given operands for a SelectInst, see if we can fold
/// the result. If not, this returns null.
Value *SimplifySelectInst(Value *Cond, Value *TrueVal, Value *FalseVal,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyGEPInst - Given operands for an GetElementPtrInst, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyGEPInst(ArrayRef<Value *> Ops, const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyInsertValueInst - Given operands for an InsertValueInst, see if we
/// can fold the result. If not, this returns null.
Value *SimplifyInsertValueInst(Value *Agg, Value *Val,
ArrayRef<unsigned> Idxs,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyTruncInst - Given operands for an TruncInst, see if we can fold
/// the result. If not, this returns null.
Value *SimplifyTruncInst(Value *Op, Type *Ty, const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
//=== Helper functions for higher up the class hierarchy.
/// SimplifyCmpInst - Given operands for a CmpInst, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyBinOp - Given operands for a BinaryOperator, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyBinOp(unsigned Opcode, Value *LHS, Value *RHS,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// \brief Given a function and iterators over arguments, see if we can fold
/// the result.
///
/// If this call could not be simplified returns null.
Value *SimplifyCall(Value *V, User::op_iterator ArgBegin,
User::op_iterator ArgEnd, const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// \brief Given a function and set of arguments, see if we can fold the
/// result.
///
/// If this call could not be simplified returns null.
Value *SimplifyCall(Value *V, ArrayRef<Value *> Args,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// SimplifyInstruction - See if we can compute a simplified version of this
/// instruction. If not, this returns null.
Value *SimplifyInstruction(Instruction *I, const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// \brief Replace all uses of 'I' with 'SimpleV' and simplify the uses
/// recursively.
///
/// This first performs a normal RAUW of I with SimpleV. It then recursively
/// attempts to simplify those users updated by the operation. The 'I'
/// instruction must not be equal to the simplified value 'SimpleV'.
///
/// The function returns true if any simplifications were performed.
bool replaceAndRecursivelySimplify(Instruction *I, Value *SimpleV,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
/// \brief Recursively attempt to simplify an instruction.
///
/// This routine uses SimplifyInstruction to simplify 'I', and if successful
/// replaces uses of 'I' with the simplified value. It then recurses on each
/// of the users impacted. It returns true if any simplifications were
/// performed.
bool recursivelySimplifyInstruction(Instruction *I,
const DataLayout *TD = nullptr,
const TargetLibraryInfo *TLI = nullptr,
const DominatorTree *DT = nullptr);
} // end namespace llvm
#endif
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