assembly - When to use which registers? -


$t (temporaries) caller saved if needed. subroutines can use w/out saving. not preserved across procedure calls.

$s (saved values) callee saved. subroutine using 1 of these must save original , restore before exiting. preserved across procedure calls.

when use registers? far guess, when working subroutines, use $s registers, and, otherwise $t registers.

when use $f registers?

use $txx as possible. use $sxx program state needs preserved across calls. (a common bug , difficult find bug accidentally expecting $txx register have unchanged state across call.)

the $fxx registers floating point use only. not use them else - way lies madness.


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