The MIPS has a floating point coprocessor (numbered 1) that operates on single precision (32-bit) and double precision (64-bit) floating point numbers. This coprocessor has its own registers, which are numbered $f0-$f31. Because these registers are only 32-bits wide, two of them are required to hold doubles. To simplify matters, floating point operations only use even-numbered registers--including instructions that operate on single floats.
Values are moved in or out of these registers a word (32-bits) at a time by lwc1, swc1, mtc1, and mfc1 instructions described above or by the l.s, l.d, s.s, and s.d pseudo instructions described below. The flag set by floating point comparison operations is read by the CPU with its bc1t and bc1f instructions.
In all instructions below, FRdest, FRsrc1, FRsrc2, and FRSource are floating point registers (e.g., $f2).
abs.d FRdest, FRsourcePoint Absolute Value Double
abs.s FRdest, FRsourcePoint Absolute Value Single
Compute the absolute value of the floating float double (single) in
register FRsource and put it in register FRdest.
add.d FRdest, FRsrc1, FRsrc2Point Addition Double
add.s FRdest, FRsrc1, FRsrc2Point Addition Single
Compute the sum of the floating float doubles (singles) in registers
FRsrc1 and FRsrc2 and put it in register FRdest.
c.eq.d FRsrc1, FRsrc2Equal Double
c.eq.s FRsrc1, FRsrc2Equal Single
Compare the floating point double in register FRsrc1 against
the one in FRsrc2 and set the floating point condition flag
true if they are equal.
c.le.d FRsrc1, FRsrc2Less Than Equal Double
c.le.s FRsrc1, FRsrc2Less Than Equal Single
Compare the floating point double in register FRsrc1 against
the one in FRsrc2 and set the floating point condition flag
true if the first is less than or equal to the second.
c.lt.d FRsrc1, FRsrc2Less Than Double
c.lt.s FRsrc1, FRsrc2Less Than Single
Compare the floating point double in register FRsrc1 against
the one in FRsrc2 and set the condition flag true if the first
is less than the second.
cvt.d.s FRdest, FRsourceSingle to Double
cvt.d.w FRdest, FRsourceInteger to Double
Convert the single precision floating point number or integer in
register FRsource to a double precision number and put it in
register FRdest.
cvt.s.d FRdest, FRsourceDouble to Single
cvt.s.w FRdest, FRsourceInteger to Single
Convert the double precision floating point number or integer in
register FRsource to a single precision number and put it in
register FRdest.
cvt.w.d FRdest, FRsourceDouble to Integer
cvt.w.s FRdest, FRsourceSingle to Integer
Convert the double or single precision floating point number in
register FRsource to an integer and put it in register
FRdest.
div.d FRdest, FRsrc1, FRsrc2Point Divide Double
div.s FRdest, FRsrc1, FRsrc2Point Divide Single
Compute the quotient of the floating float doubles (singles) in
registers FRsrc1 and FRsrc2 and put it in register
FRdest.
l.d FRdest, addressFloating Point Double 
l.s FRdest, addressFloating Point Single
Load the floating float double (single) at address into register
FRdest.
mov.d FRdest, FRsourceFloating Point Double
mov.s FRdest, FRsourceFloating Point Single
Move the floating float double (single) from register FRsource to
register FRdest.
mul.d FRdest, FRsrc1, FRsrc2Point Multiply Double
mul.s FRdest, FRsrc1, FRsrc2Point Multiply Single
Compute the product of the floating float doubles (singles) in
registers FRsrc1 and FRsrc2 and put it in register
FRdest.
neg.d FRdest, FRsourceDouble
neg.s FRdest, FRsourceSingle
Negate the floating point double (single) in register FRsource
and put it in register FRdest.
s.d FRdest, addressFloating Point Double
s.s FRdest, addressFloating Point Single
Store the floating float double (single) in register FRdest at
address.
sub.d FRdest, FRsrc1, FRsrc2Point Subtract Double
sub.s FRdest, FRsrc1, FRsrc2Point Subtract Single
Compute the difference of the floating float doubles (singles) in
registers FRsrc1 and FRsrc2 and put it in register
FRdest.