High Quality Content by WIKIPEDIA articles! In computing, a basic block is code that has one entry point (i.e., no code within it is the destination of a jump instruction), one exit point and no jump instructions contained within it (i.e., a sequence of instructions which are all executed if the first one in the sequence is executed). The start of a basic block may be jumped to from more than one location. The end of a basic block may be a jump instruction or the statement before the destination of a jump instruction. Basic blocks are usually the basic unit to which compiler optimizations are applied. Basic blocks form the vertices or nodes in a control flow graph. The code may be source code, assembly code or some other sequence of instructions. More formally, a sequence of instructions forms a basic block if the instruction in each position dominates, or always executes before, all those in later positions, and no other instruction executes between two instructions in the sequence. This definition is more general than the intuitive one in some ways. For example, it allows unconditional jumps to labels not targeted by other jumps.

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