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Original question:

GCC for MSP430 Interrupt Prolog/Epilog when calling a function

Compiler: MSP430 GCC interrupt code still saves too many registers

David Schultz
Guru 24375 points

Tool/software: TI C/C++ Compiler

Supposedly in the queue three years ago but still a problem. When another function is called from within an ISR, all registers are saved. Even those that are required to be saved/restored by the called function.

e2e.ti.com/.../507626