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High optimization technique in IAR workbench IDE 9.60.3

jack kiee

What does the 'High' optimization level actually do in IAR Embedded Workbench 9.60.3 when the 'Size' option is selected, but no additional optimization checkboxes are enabled. Even without selecting any extra options, the code size reduces significantly—up to 30%. How is the  IAR Embedded Workbench 9.60.3 achieving this reduction, and what specific optimizations are being performed in this case.