Everything about Branch Computer Science totally explained
A
branch (or
jump on some
computer architectures, such as the
PDP-8 and
Intel x86) is a point in a
computer program where the
flow of control is altered. The term branch is usually used when referring to a program written in
machine code or
assembly language; in a
high-level programming language, branches usually take the form of
conditional statements,
subroutine calls or
GOTO statements. An instruction that causes a branch, a branch instruction, can be
taken or
not taken: if a branch isn't taken, the flow of control is unchanged and the next instruction to be executed is the instruction immediately following the current instruction in
memory; if taken, the next instruction to be executed is an instruction at some other place in memory. There are two usual forms of branch instruction: a
conditional branch that can be either taken or not taken, depending on a condition such as a
CPU flag, and an
unconditional branch which is always taken.
Examples
An unconditional branch in Intel assembly language:
jmp 0x00100000
A conditional branch in Intel assembly language:
jz 0x00100000
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