Reg		Notes
$f0..$f2		hold floating-point function results
$f4..$f10		temporary registers; not preserved across function calls
$f12..$f14		used for first two double-precision function arguments
$f16..$f18		temporary registers; used for expression evaluation
$f20..$f30		saved registers; value is preserved across function calls

Notes:

• float registers come in pairs of 2 × 32-bits
• only even registers are addressed for double-precision
• You won't be using during this course unless you do some of the challenge exercises.