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This optimization was specially developed for the C16x/ST10. The C16x/ST10 features a "segmented" memory architecture, where arbitrary access to the 16MB address space requires the use of Data Page Pointer registers or "Extended Page" sequences. The difference is:

• DPP settings hold for as many instructions as the DPP register remains unchanged
• EXTP instruction qualifiers only hold for immediate subsequent instructions

A combination of several code analyses featured by aiPop enables new points to be determined for the DPP0 register to be set so that EXTP qualifiers can be saved.

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URL: http://www.absint.com/aipop/slides/12.htm