其中,Opcode是指令操作符,长度占7位,且位于32位中6~0的位置;rd是输出寄存器,长度占5位,位于11~7;funct3用于指明具体的指令,这是因为RISCV中仅Opcode无法具体确定一个指令,而是需要用funct3辅助来确认,其长度占3位,位于14~12;rs1是输入操作数,是一个寄存器,长度占5位,位于19~15;imm12是输入操作数,是一个立即数,长度占12位,位于3
{ return Opc <= TargetOpcode::GENERIC_OP_END; } static bool isGenericAtomicRMWOpcode(unsigned Opc) { return Opc >= TargetOpcode::GENERIC_ATOMICRMW_OP_START && Opc <= TargetOpcode::GENERIC_ATOMICRMW_OP_END; } /// Given a machine instruction descriptor, returns the register /// class ...
if (g_cur_token != TOKEN_IDENTIFIER) return LogError("expected identifier after for"); std::string identifier_name = g_identifier_str; NextToken(); // eat identifier. if (g_cur_token != '=') return LogError("expected '=' after for"); NextToken(); // eat '='. auto start = P...
static SmallVector<InterchangeableInstruction> getInterchangeableInstruction(Instruction *I) { // PII = Possible Interchangeable Instruction SmallVector<InterchangeableInstruction> PII; unsigned Opcode = I->getOpcode(); PII.emplace_back(Opcode, I->operands()); if (!is_contained({Instruction::Shl, Instruc...
Descriptions define things like the mnemonic for the opcode, the number of operands, the list of implicit register uses and defs, whether the instruction has certain target-independent properties (accesses memory, is commutable, etc), and holds any target-specific flags....
In this code, we do a simple switch on the opcode to create the right LLVM instruction. In the example above, the LLVM builder class is starting to show its value. IRBuilder knows where to insert the newly created instruction, all you have to do is specify what instruction to create (...
(llvm::lto::Config const&, std::__1::function<llvm::Expected<std::__1::unique_ptr<llvm::CachedFileStream, std::__1::default_delete<llvm::CachedFileStream>>> (unsigned int, llvm::Twine const&)>, unsigned int, llvm::Module&, llvm::ModuleSummaryIndex&) (/usr/lib/llvm/18/bin/.....
(state.pc->inst->getOpcode() == Instruction::PHI) { PHINode *first = static_cast(state.pc->inst); state.incomingBBIndex = first->getBasicBlockIndex(src); }}void Executor::executeInstruction(ExecutionState &state, KInstruction *ki) { Instruction *i = ki->inst; switch (i->getOpcode(...
9.5.2 Instruction类的重要Public成员 BasicBlock *getParent() 返回嵌入该 Instruction 的 BasicBlock。 bool mayWriteToMemory() 如果指令(即call、free、invoke或store)写入内存,则返回true。 unsigned getOpcode() 返回该 Instruction 的操作码。 Instruction *clone() const 返回指定指令的另一个实例,该实例在所有...
Together, these three cases are all pattern matched and the function returns the replacement if it can, or a null pointer if no replacement is possible. The caller of this function (SimplifyInstruction) is a dispatcher that does a switch on the instruction opcode, dispatching to...