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Machine Dependent Features

The machine instruction sets are (almost by definition) different on each machine where as runs. Floating point representations vary as well, and as often supports a few additional directives or command-line options for compatibility with other assemblers on a particular platform. Finally, some versions of as support special pseudo-instructions for branch optimization. For details on particular architectures, see the hardware manufacturer’s manual.

The following documentation discusses the assembler directives and machine dependent features regarding the following supported architectures.

VAX (see VAX Dependent Features)

AMD 29K (see AMD 29K Dependent Features)

Hitachi H8/300 (see H8/300 Dependent Features)

Hitachi H8/500 (see H8/500 Dependent Features)

HPPA (see HPPA Dependent Features)

Hitachi SH (see Hitachi SH Dependent Features)

Intel i960 (see Intel 960 Dependent Features)

Motorola M68K (see M680x0 Dependent Features)

SPARC (see SPARC Dependent Features)

80386 (see 80386 Dependent Features)

Z8000 (see Z8000 Dependent Features)

MIPS (see MIPS Dependent Features)