[optimize]添加更为通用的除法强度削减Pass, 不受除数限制替换div指令，不影响当前分数

src/include/backend/RISCv64/RISCv64LLIR.h

@@ -45,7 +45,7 @@ enum class PhysicalReg {
 // RISC-V 指令操作码枚举
 enum class RVOpcodes {
     // 算术指令
-    ADD, ADDI, ADDW, ADDIW, SUB, SUBW, MUL, MULW, DIV, DIVW, REM, REMW,
+    ADD, ADDI, ADDW, ADDIW, SUB, SUBW, MUL, MULW, MULH, DIV, DIVW, REM, REMW,
     // 逻辑指令
     XOR, XORI, OR, ORI, AND, ANDI,
     // 移位指令

src/include/midend/IR.h

@@ -709,7 +709,7 @@ class Instruction : public User {
     kBitItoF = 0x1UL << 40,
     kBitFtoI = 0x1UL << 41,
     kSRA = 0x1UL << 42,
-    kMulh = 0x1UL << 43,
+    kMulh = 0x1UL << 43
   };
 
 protected:
@@ -823,7 +823,7 @@ public:
 
   bool isBinary() const {
     static constexpr uint64_t BinaryOpMask =
-        (kAdd | kSub | kMul | kDiv | kRem | kAnd | kOr | kSRA) |
+        (kAdd | kSub | kMul | kDiv | kRem | kAnd | kOr | kSRA | kMulh) |
         (kICmpEQ | kICmpNE | kICmpLT | kICmpGT | kICmpLE | kICmpGE);
     return kind & BinaryOpMask;
   }

src/include/midend/IRBuilder.h

@@ -220,6 +220,9 @@ class IRBuilder {
   BinaryInst * createSRAInst(Value *lhs, Value *rhs, const std::string &name = "") {
     return createBinaryInst(Instruction::kSRA, Type::getIntType(), lhs, rhs, name);
   }  ///< 创建算术右移指令
+  BinaryInst * createMulhInst(Value *lhs, Value *rhs, const std::string &name = "") {
+    return createBinaryInst(Instruction::kMulh, Type::getIntType(), lhs, rhs, name);
+  }  ///< 创建高位乘法指令
   CallInst * createCallInst(Function *callee, const std::vector<Value *> &args, const std::string &name = "") {
     std::string newName;
     if (name.empty() && callee->getReturnType() != Type::getVoidType()) {