4 ms·

Everything that's not a struct that you would pass as a parameter (int, pointer, char, etc) all fit in a register and there are register reserved for function p

Everything that's not a struct that you would pass as a parameter (int, pointer, char, etc) all fit in a register and there are register reserved for function parameters in the ISA. Structs with more than one field don't fit into a register.

saagarjha 6y ago
Note that calling conventions for aggregates will frequently allow them to be split across registers.
nikki93 6y ago
https://godbolt.org/z/11931W https://godbolt.org/z/11931W Struct with multiple fields fitting into multiple registers.