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j 1-j 3 – these three bits specify an arithmetic branch condition, an unconditional branch (jump), or no branching The Hack computer encoding scheme of the C-instruction is shown in the following tables. In these tables, A represents the value currently contained in the A-register; D represents the value currently contained in the D-register
Some early and simple CPU architectures, still found in microcontrollers, may not implement a conditional jump, but rather only a conditional "skip the next instruction" operation. A conditional jump or call is thus implemented as a conditional skip of an unconditional jump or call instruction.
In computer programming, a branch table or jump table is a method of transferring program control to another part of a program (or a different program that may have been dynamically loaded) using a table of branch or jump instructions. It is a form of multiway branch.
Here, there are two successive goto fail statements. In the syntax of the C language, the second is unconditional, and hence always skips the call to SSLHashSHA1.final. As a consequence, err will hold the status of the SHA1 update operation, and signature verification will never fail. [5] Here, the unreachable code is the call to the final ...
In computer science, control flow (or flow of control) is the order in which individual statements, instructions or function calls of an imperative program are executed or evaluated. The emphasis on explicit control flow distinguishes an imperative programming language from a declarative programming language.
An indirect branch (also known as a computed jump, indirect jump and register-indirect jump) is a type of program control instruction present in some machine language instruction sets. Rather than specifying the address of the next instruction to execute , as in a direct branch , the argument specifies where the address is located.
Simple statements are complete in themselves; these include assignments, subroutine calls, and a few statements which may significantly affect the program flow of control (e.g. goto, return, stop/halt). In some languages, input and output, assertions, and exits are handled by special statements, while other languages use calls to predefined ...
As used in some Lisp implementations, a trampoline is a loop that iteratively invokes thunk-returning functions (continuation-passing style).A single trampoline suffices to express all control transfers of a program; a program so expressed is trampolined, or in trampolined style; converting a program to trampolined style is trampolining.