Static single assignment
Imagine you have a bunch of toys (variables) and a toy box (program).
Usually, when you put a toy in the toy box, it stays there until you take it out. But sometimes, you want to change the toy box without taking the toys out - this is what static single assignment (SSA) is for.
In SSA, every time you want to change the toy box, you take the toy out and put a new one in its place, even if it's the same toy. This way, you can always see what's in the toy box at every stage of the program.
For example, if you have a toy car that you move around the toy box, you might give it a new name every time it moves. So, you might have "car1" at one point and "car2" at another point, but they both refer to the same toy car.
Similarly, in a program, if you have a variable that changes value, you might give it a new name every time it changes. This makes it easier to keep track of what's going on in the program at every stage.
Overall, static single assignment helps programmers keep track of variables and their values throughout a program, which makes it easier to debug and optimize the code.
Usually, when you put a toy in the toy box, it stays there until you take it out. But sometimes, you want to change the toy box without taking the toys out - this is what static single assignment (SSA) is for.
In SSA, every time you want to change the toy box, you take the toy out and put a new one in its place, even if it's the same toy. This way, you can always see what's in the toy box at every stage of the program.
For example, if you have a toy car that you move around the toy box, you might give it a new name every time it moves. So, you might have "car1" at one point and "car2" at another point, but they both refer to the same toy car.
Similarly, in a program, if you have a variable that changes value, you might give it a new name every time it changes. This makes it easier to keep track of what's going on in the program at every stage.
Overall, static single assignment helps programmers keep track of variables and their values throughout a program, which makes it easier to debug and optimize the code.