Processor Pipeline Forwarding Logic

Concept

Processor pipeline forwarding logic is the pipeline behavior that determines the architecturally visible register-file value when implementation registers may be affected by multiple instructions currently in flight. In formal architectural views, this forwarding behavior can be abstracted by a mapping function such as `vreg`, which represents the architectural register file while hiding the implementation-level forwarding details.

First seen 5/29/2026

Last seen 5/29/2026

Evidence 1 chunks

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WIKI

Overview

Processor pipeline forwarding logic is the part of a pipelined processor's implementation behavior that accounts for register values when several instructions are simultaneously being processed by the pipeline. The cited evidence describes this in the context of a pipelined processor register file: implementation-register behavior may depend on multiple instructions that are currently in the pipeline, so a mapping function is used to relate the architectural register-file state to the implementation state.^[1]

Role in architectural-state abstraction

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pipelined processor part of → 100% 1e

Processor pipeline forwarding logic is part of the pipelined processor implementation.

LINKED ENTITIES

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pipelined processor PART_OF The evidence explicitly discusses forwarding logic as the forwarding logic of a pipeline in the register file of a pipelined processor.

CITATIONS

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[1] In a pipelined processor, implementation-register behavior may depend on several instructions currently being processed by the pipeline, and the mapping function linking architectural register-file state to implementation state captures the pipeline forwarding logic. Generating an Efficient Instruction Set Simulator from a Complete Property Suite

[2] The mapping function `vreg` represents the architectural register file and hides the pipeline forwarding logic. Generating an Efficient Instruction Set Simulator from a Complete Property Suite

[3] Architectural-state mapping functions allow operation properties to resemble high-level specifications and remain more compact than the implementation logic they abstract. Generating an Efficient Instruction Set Simulator from a Complete Property Suite