Data Movement

Instruction Operation

mov.s fd, fs

Instruction	Operation
mov.s fd, fs	copy 32 bits from float register `$fs` to float register `$fd`
mtc1 rs, fd	move to coprocessor 1 Copy 32 bits from general register `$rs` to float register `$fd`. No data conversion is done. Note: the source register is `$rs` and the destination register is `$fd`, the reverse of the usual order.
mfc1 rd, fs	move from coprocessor 1 copy 32 bits from float register `$fs` to general register `$rd`. No data conversion is done.

copy 32 bits from float register $fs
to float register $fd

mtc1 rs, fd

move to coprocessor 1

Copy 32 bits from general register $rs
to float register $fd.
No data conversion is done.
Note: the source register is
$rs and the destination register is
$fd, the reverse of the usual order.

mfc1 rd, fs

move from coprocessor 1

copy 32 bits from float register $fs
to general register $rd.
No data conversion is done.

There are three instructions that move data between registers inside the processor.

These instructions merely copy bit patterns between registers. The patterns are not altered. With the mfc1 instruction, the contents of a floating point register is copied "as is" to a general purpose register.

A complicated calculation with integers can use float registers to hold intermediate results. But the float registers cannot be used in integer instructions. And a complicated calculation with floats can use general purpose registers the same way. But the general purpose registers cannot be used in floating point instructions.

Answer:

Data Movement

QUESTION 14: