Conditional branches between basic blocks

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In computer science, particularly in the field of compilers and code optimization, a basic block is a straight-line code sequence with no branches in except to the entry and no branches out except at the exit. This means that there are no jumps or conditional branches in the middle of the block, and no jump targets into the middle of the block from outside.

Conditional branches are used to control the flow of execution in a program. They allow the program to make decisions based on certain conditions. If the condition is true, the program will execute one block of code, and if it's false, it will execute another.

Here's a step-by-step explanation of how conditional branches between basic blocks work:

1. The program reaches a conditional branch in the code.
2. It evaluates the condition in the branch. This could be any boolean expression, like "x > 5" or "y == z".
3. If the condition is true, the program jumps to the basic block specified in the true branch. This block of code is executed.
4. If the condition is false, the program jumps to the basic block specified in the false branch. This block of code is executed.
5. After the chosen block is executed, the program continues with the next basic block in the sequence.

This mechanism allows for complex control flows and decision-making in programs.