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; Most architectures will transform the index in some way before ; adding it to the program counter. table; The branch table begins here with this label goto index_zero; each of these goto instructions is an unconditional branch goto index_one; of code. goto index_two goto index_three index_zero; Code is added here to perform whatever action is ...
[a] Branch (or branching, branched) may also refer to the act of switching execution to a different instruction sequence as a result of executing a branch instruction. Branch instructions are used to implement control flow in program loops and conditionals (i.e., executing a particular sequence of instructions only if certain conditions are ...
Download as PDF; Printable version; ... 'J', 'Q', and 'V' to hold 64 bit addresses. Relocatability ... an unconditional branch instruction (built using an S-type ...
Conditional branching statements allow a sequence of statements to be executed only if some condition is met. Otherwise, the statements are skipped and the execution sequence continues from the statement following them. Unconditional branching statements allow an execution sequence to be transferred to another part of a program.
Executing a set of statements only if some condition is met (choice - i.e., conditional branch) Executing a set of statements zero or more times, until some condition is met (i.e., loop - the same as conditional branch) Executing a set of distant statements, after which the flow of control usually returns (subroutines, coroutines, and ...
A more generalized and capable form is full predication. Full predication has a set of predicate registers for storing predicates (which allows multiple nested or sequential branches to be simultaneously eliminated) and most instructions in the architecture have a register specifier field to specify which predicate register supplies the predicate.
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Here's the simplest C example I can think of (which uses effectively the second CONDFUNC1 definition above) - here branching_f is ordinary branching code (with an if statement, that only works on a conventional computer, and branchless_f is the equivalent code, which produces the same result, but has no if or other branching instruction (the ...