Arithmetic Processing Device Unrounded Result Bypass Logic
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Solution Overview
Problem
Existing arithmetic processing devices face inefficiencies in floating-point operations due to the need for rounding stages in pipelines, which can delay calculations and reduce pipeline efficiency, especially when handling unrounded results in subsequent operations.
Innovation Solution
The implementation of unrounded result bypass logic allows unrounded results from one arithmetic calculation to be directly forwarded as operands to subsequent operations within the same or another fused multiply-addition module, bypassing the rounding stage and enabling earlier completion of calculations, thus improving pipeline efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rounding stage is included in the floating-point pipeline, then calculation accuracy is improved, but pipeline efficiency deteriorates due to increased latency
Solution Approach 1:
The patent segments the floating-point pipeline into multiple stages, with the rounding operation separated from the main execution path. The unrounded result is forwarded through a bypass path while the rounded result follows the normal pipeline, allowing independent processing of accuracy-critical and speed-critical operations.
Solution Approach 2:
The patent introduces an intermediary bypass mechanism that carries unrounded results directly from the execution unit to subsequent operations. This intermediary path acts as a mediator that preserves calculation precision without forcing all operations to wait for the rounding stage to complete.
2Measurement precision
If rounding is performed before subsequent operations, then result precision is improved, but calculation speed deteriorates due to pipeline stalls
Solution Approach 1:
The patent performs preliminary forwarding of unrounded results to subsequent operations before the rounding stage completes. This preliminary action allows dependent operations to begin execution earlier using the available unrounded data, reducing overall pipeline latency while maintaining the option to round later if precision is critical.
3Productivity
If unrounded results are forwarded to subsequent operations, then pipeline efficiency is improved, but result accuracy may deteriorate
Solution Approach 1:
The patent implements a dynamic selection mechanism that determines whether to use rounded or unrounded results based on the specific operation requirements. The system can dynamically switch between using rounded results for final output and unrounded results for intermediate calculations, optimizing both accuracy and performance based on contextual needs.
Data Source
AI summary
A device and methods are disclosed for communicating an unrounded result from one arithmetic calculation for use in a second, subsequent calculation. For example, an unrounded result of a first calculation can be forwarded to provide a multiplier, a multiplicand or an addend operand for the subsequent operation. The operand can be forwarded to the input of the same fused multiply addition module (FMAM) that supplied the result, or to another FMAM, and do so without regard to the precision of the forwarded operand, the precision of the subsequent operation, or the native precision of the FMAM.