Compiler Straight-Line Post-Increment Optimization

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Solution Overview

Problem

Existing techniques lack automation for optimizing straight-line, non-inductive code to leverage the efficiency of base register autoincrement addressing mode, making manual optimization tedious, time-consuming, and prone to errors.

Innovation Solution

A computer-implemented method for compiler straight-line post-increment (SLPI) optimization that converts candidate memory access instructions into pseudo-memory instructions and then synthesizes them into architected memory instructions conforming to the base register auto-increment addressing mode, reducing the number of instructions needed for memory access operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If manual optimization is used to convert instructions to base register autoincrement addressing mode, then execution efficiency is improved, but the optimization process is tedious, time-consuming, and error-prone

Engineering Contradiction:

Improveexecution efficiencyVSAvoidoptimization time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The compiler automatically performs the optimization transformation without requiring manual programmer intervention. The system identifies candidate instructions, analyzes their suitability for base register autoincrement mode, and performs the conversion automatically, making the optimization process self-service rather than manual.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the manual mechanical process of instruction conversion with an automated compiler-based system. The compiler uses algorithmic analysis to identify optimization opportunities and automatically transforms instructions, substituting human manual work with automated computational processes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If more instructions are used to set up address operands, then address computation is more flexible, but resource contention increases and instruction cache misses occur

Engineering Contradiction:

Improveaddress computation flexibilityVSAvoidresource utilization

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent merges the address setup operation with the memory access operation itself. By using base register autoincrement mode, the address computation and memory access are combined into a single instruction, eliminating separate setup instructions and reducing resource contention.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The base register is used for multiple purposes: it serves as both the address base for memory access and is automatically updated to point to the next memory location. This multi-functionality eliminates the need for separate address setup instructions for subsequent accesses.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Manufacturing precision

If manual optimization is applied, then optimization accuracy can be controlled, but the process is susceptible to missed optimization opportunities

Engineering Contradiction:

Improveoptimization accuracyVSAvoidoptimization coverage

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The compiler implements a systematic feedback mechanism by analyzing program semantics, data dependencies, and control flow to automatically identify instructions that are suitable for base register autoincrement optimization. This ensures comprehensive coverage without missing opportunities while maintaining accuracy through rigorous analysis.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The compiler performs preliminary analysis of candidate instructions before optimization, examining their suitability for base register autoincrement mode. This preliminary action ensures that only appropriate instructions are optimized, maintaining accuracy while comprehensively identifying optimization opportunities.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7594223B2Straight-line post-increment optimization for memory access instructions

Publication Date: 2009.09.22 VALTRUS INNOVATIONS LTD

AI summary

A compiler configured for optimizing non-loop memory access instructions of a computer program to form architected memory instructions conforming to a base register auto-incrementing addressing mode. The compiler includes code for obtaining an intermediate stream of code containing pseudo-memory instructions from the non-loop memory access instructions. The intermediate stream of code includes at least one place holder instruction preserving a value associated with a base of a first non-loop memory access instruction even after the first non-loop memory instruction is converted to one of the pseudo-memory instructions. The compiler includes code for converting the intermediate stream of code using the intermediate stream of code and the at least one place holder instruction to obtain the architected memory instructions.