如何使用llvm::IRBuilder Create Add/Sub/Mul/Div？
如何使用llvm::IRBuilder Create Add/Sub/Mul/Div？
提问于 2020-04-14 20:26:54
我正在尝试使用llvm::IRBuilder创建Add/Sub/Mul/Div操作。但是https://llvm.org/doxygen/classllvm_1_1IRBuilder.html#a4ef70bab263e38c5e0b8c1bf95a5d814中有很多apis
Value * CreateAdd (Value *LHS, Value *RHS, const Twine &Name="", bool HasNUW=false, bool HasNSW=false);
Value * CreateNSWAdd (Value *LHS, Value *RHS, const Twine &Name="");
Value * CreateNUWAdd (Value *LHS, Value *RHS, const Twine &Name="");
Value * CreateSub (Value *LHS, Value *RHS, const Twine &Name="", bool HasNUW=false, bool HasNSW=false);
Value * CreateNSWSub (Value *LHS, Value *RHS, const Twine &Name="");
Value * CreateNUWSub (Value *LHS, Value *RHS, const Twine &Name="");
Value * CreateMul (Value *LHS, Value *RHS, const Twine &Name="", bool HasNUW=false, bool HasNSW=false);
Value * CreateNSWMul (Value *LHS, Value *RHS, const Twine &Name="");
Value * CreateNUWMul (Value *LHS, Value *RHS, const Twine &Name="");
Value * CreateUDiv (Value *LHS, Value *RHS, const Twine &Name="", bool isExact=false);
Value * CreateExactUDiv (Value *LHS, Value *RHS, const Twine &Name="");
Value * CreateSDiv (Value *LHS, Value *RHS, const Twine &Name="", bool isExact=false);
Value * CreateExactSDiv (Value *LHS, Value *RHS, const Twine &Name="");当我想要生成Add/Sub/Mul/Div操作时，我应该使用哪一个？
回答 2
Stack Overflow用户
发布于 2020-04-14 23:05:31
NSW (No Signed Wrap)和NUS(No Unsigned Wrap)
当运算结果落在带符号整数类型的可表示范围之外时，就会发生带符号整数溢出。对于say和Add运算，如果您希望运算结果在超过最大值时对该整数类型的MAX_INT进行换行(即$(2)^(32)$ -1，表示无符号i32)，请使用CreateAdd。
通过回绕，我们的意思是如果它的值超过MAX_INT(溢出)，那么它就被设置为MIN_INT。CreateNSWAdd将允许对无符号整数进行包装，但会为有符号整数生成毒值(未定义的行为)。CreateNUSAdd将生成一个加法操作，允许对有符号整数进行包装，但不允许对其无符号伙伴进行包装。
Stack Overflow用户
发布于 2021-11-30 04:54:01
using System;
namespace ConsoleApp1
{
class Program
{
public static int Addition(int value1, int value2)
{
return value1 + value2;
}
public static int Subtraction(int value1, int value2)
{
return value1 - value2;
}
public static int Multiplication(int value1, int value2)
{
return value1 * value2;
}
public static double Division(double value1, double value2)
{
return value1 / value2;
}
static void Main(string[] args)
{
while (true)
{
Console.Write("\nEnter Value 1 : ");
int a = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter Value 2 : ");
int b = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Please Enter action to be performed :");
Console.WriteLine("1. Addition");
Console.WriteLine("2. Subtraction");
Console.WriteLine("3. Multiplication");
Console.WriteLine("4. Division");
int action = Convert.ToInt32(Console.ReadLine());
string _operation = "";
double result = 0;
switch (action)
{
case 1:
{
result = Addition(a, b);
_operation = "+";
break;
}
case 2:
{
result = Subtraction(a, b);
_operation = "-";
break;
}
case 3:
{
result = Multiplication(a, b);
_operation = "*";
break;
}
case 4:
{
result = Division(a, b);
_operation = "/";
break;
}
}
Console.WriteLine("Result A {0} B = {1}", _operation, result);
char theKey = Console.ReadKey().KeyChar;
if (theKey == 'y' || theKey == 'Y')
{
Console.Clear();
continue;
}
else
{
break;
}
}
}
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/61207663
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