DSP for Embedded and Real-Time Systems

Chapter 12

DSP Optimization – Memory Optimization

Robert Oshana

Chapter Outline

Introduction

Code size optimizations

Compiler flags and flag mining

Target ISA for size and performance tradeoffs

Tuning the ABI for code size

Caveat emptor: compiler optimization orthogonal to code size!

Memory layout optimization

Overview of memory optimization

Focusing optimization efforts

Vectorization and the dynamic code-compute ratio

Pointer aliasing in C

Data structures, arrays of data structures, and adding it all up!

Loop optimizations for memory performance

Data alignment’s rippling effects

Selecting data types for big payoffs

Introduction

Optimization metrics for compiled code are not always measured in resulting execution clock cycles on the target ...