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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 ...
Download as PDF; Printable version; ... 'J', 'Q', and 'V' to hold 64 bit addresses. Relocatability ... an unconditional branch instruction (built using an S-type ...
[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 ...
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 ...
Branch prediction attempts to guess whether a conditional jump will be taken or not. Branch target prediction attempts to guess the target of a taken conditional or unconditional jump before it is computed by decoding and executing the instruction itself. Branch prediction and branch target prediction are often combined into the same circuitry.
Terminate indirect branch in 32-bit mode [b] 3 Tiger Lake: ENDBR64: F3 0F 1E FA: Terminate indirect branch in 64-bit mode [b] NOTRACK: 3E [c] Prefix used with indirect CALL/JMP near instructions (opcodes FF /2 and FF /4) to indicate that the branch target is not required to start with an ENDBR32/64 instruction. Prefix only honored when NO_TRACK ...
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With predication, all possible branch paths are coded inline, but some instructions execute while others do not. The basic idea is that each instruction is associated with a predicate (the word here used similarly to its usage in predicate logic) and that the instruction will only be executed if the predicate is true.