What is an inline assembly?

Inline assembly - also called inline or inline Assembler - is a block code of the assembly language that is inserted directly into the functions and source code for another language. This allows the programmer to insert a block of net language build into a program in which the rest of the program uses language without assembly. The ability is supported in some languages ​​- for example C, C ++ and Pascal - but it is a feature of a specific compiler and does not necessarily have to be part of the language standard. In many cases, the inline assembly is used to access special functions in the central processing unit (CPU), to optimize code, or to perform very low levels, such as bliting memory. Although a certain compiler or programming language may have support for creating executable files across platforms, the use of inline assemblies usually limits the program to systems that can use specific assembly instructions or have adequate architecture.

there are severalIK Ways to include an inline assembly in a standard source code file. One of the simplest methods is simply by defining the beginning of the mounting block, after which all commands are interpreted as a direct assembly. Some integrated development environments (IDE) and compilations actually allow inline code to use variables defined in the program or function without explicit loading into the registers first.

Another way inline assembly is defined in the source file is using the reserved function of the report. In this case, the inline code cannot usually be combined with a code without assembly, such as a check loop or return command. When implementing in this way, inline functions must usually explicitly push and talked on the magazine and turn off to use local variables or pass the Venstrana values.

One of the most common uses for the inline assembly code is Pinpoint optimization for small segments of the program. Depending on how the inline code is integrated, this can mean using the language orders of the readable person wrapped around inline code, which directly performs some action very quickly and efficiently. In addition, if the target system is known, the code can use registers and commands specific to hardware that can run the program much faster.

Inline assembly can be used to access parts of the operating system, CPU or even hardware port directly if other methods could fail or cause a system error. This can be used to quickly change the frames on the graphics card or to send signals directly to a specific interruption or hardware port. However, one risk of using the assembly code in this way is that small mistakes can be difficult to find or cause the program to find unexpectedly on certain systems.