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This article describes the calling conventions used when programming x86 architecture microprocessors. Calling conventions describe the interface of called code: The order in which atomic (scalar) parameters, or individual parts of a complex parameter, are allocated; How parameters are passed (pushed on the stack, placed in registers, or a mix ...
The calling convention of a given program's language may differ from the calling convention of the underlying platform, OS, or of some library being linked to. For example, on 32-bit Windows, operating system calls have the stdcall calling convention, whereas many C programs that run there use the cdecl calling convention. To accommodate these ...
A common aspect of an ABI is the calling convention, which determines how data is provided as input to, or read as output from, computational routines. Examples of this are the x86 calling conventions. Adhering to an ABI (which may or may not be officially standardized) is usually the job of a compiler, operating system, or library author ...
Whether it is faster or slower depends on the particular x86-processor implementation as well as the calling convention used by the compiler, programmer or particular program code; most x86 code is intended to run on x86-processors from several manufacturers and on different technological generations of processors, which implies highly varying ...
X86 assembly language; X86 calling conventions; X86 virtualization; X86-64; X87 This page was last edited on 9 January 2020, at 20:56 (UTC). Text is available under ...
The x86 instruction set refers to the set of instructions that x86-compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor. The x86 instruction set has been extended several times, introducing wider registers and datatypes as well as new ...
Under certain calling conventions it is the callee's responsibility to clean the arguments off the stack, so the epilogue can also include the step of moving the stack pointer down or up. For example, these three steps may be accomplished in 32-bit x86 assembly language by the following instructions:
This problem is an act to force some variables to be assigned to particular registers. For example, in PowerPC calling conventions, parameters are commonly passed in R3-R10 and the return value is passed in R3. [12] NP-Problem Chaitin et al. showed that register allocation is an NP-complete problem.