# Optimization and Programming Guide

This section contains information about features related to code optimization and program performance improvement.

Parent topic: Intel® oneAPI DPC++/C++ Compiler Developer Guide and Reference

- Extensions
- OpenMP* Support
- Intel® oneAPI Level Zero Introduction
- Predefined Environment Variables
- Vectorization
- High-Level Optimization (HLO)
- Interprocedural Optimization (IPO)
- Methods to Optimize Code Size
- Intel® Math Library