IBM User Guide for Java V7 on Windows > IBM SDK for Java > The JIT compiler > How the JIT compiler optimizes code

Phase 2 - local optimizations

Local optimizations analyze and improve a small section of the code at a time. Many local optimizations implement tried and tested techniques used in classic static compilers.

The optimizations include:

• Local data flow analyses and optimizations
• Register usage optimization
• Simplifications of Java™ idioms

These techniques are applied repeatedly, especially after global optimizations, which might have pointed out more opportunities for improvement.

Parent: How the JIT compiler optimizes code

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