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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Flow-control-structures/ARM-Assembly/flow-control-structures.arm Normal file
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SWI n ;software system call
B label ;Branch. Just "B" is a branch always, but any condition code can be added for a conditional branch.
;In fact, almost any instruction can be made conditional to avoid branching.
BL label ;Branch and Link. This is the equivalent of the CALL command on the x86 or Z80.
;The program counter is copied to the link register, then the operand of this command becomes the new program counter.
BX Rn ;Branch and Exchange. The operand is a register. The program counter is swapped with the register specified.
;BX LR is commonly used to return from a subroutine.
addeq R0,R0,#1 ;almost any instruction can be made conditional. If the flag state doesn't match the condition code, the instruction
;has no effect on registers or memory.