Complex Addressing Modes
ConceptComplex addressing modes refer to memory access patterns used in modern instruction set architectures (such as PowerPC and x86) whose structure combines multiple components—base registers, index registers, displacement values, and scaling factors—in ways that complicate automatic generation of valid memory accesses. They are a key target of address constraint satisfaction algorithms used in test program generation.
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Complex Addressing Modes
Definition and Scope
In instruction set architectures such as PowerPC and x86, memory operands are described by addressing modes that specify how an effective address is computed from register and constant components. Many of these modes are complex because they combine several operands—base registers, index registers, scaled indices, and displacements—into a single effective address computation. The precise set of components and the rules for combining them are architecture-specific.
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