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Add extra comments.
To persuade myself in the future.
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@ -221,10 +221,15 @@ struct Registers {
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// For outgoing modes other than FIQ, only save the final two registers for now;
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// if the incoming mode is FIQ then the other five will be saved in the next switch.
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// For FIQ, save all seven up front.
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switch(mode_) {
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// FIQ outgoing: save R8 to R14.
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case Mode::FIQ:
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std::copy(active_.begin() + 8, active_.begin() + 15, fiq_registers_.begin());
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break;
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// Non-FIQ outgoing: save R13 and R14. If saving to the user registers,
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// use only the final two slots.
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case Mode::User:
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std::copy(active_.begin() + 13, active_.begin() + 15, user_registers_.begin() + 5);
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break;
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@ -240,7 +245,10 @@ struct Registers {
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// For FIQ: save an additional five, then overwrite seven.
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switch(target_mode) {
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case Mode::FIQ:
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// FIQ is incoming, so save registers 8 to 12 to the first five slots of the user registers.
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std::copy(active_.begin() + 8, active_.begin() + 13, user_registers_.begin());
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// Replace R8 to R14.
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std::copy(fiq_registers_.begin(), fiq_registers_.end(), active_.begin() + 8);
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break;
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case Mode::User:
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