msub
Multiply-subtract signed
Multiplies $t1 by $t2 (signed) to form a 64-bit product, then subtracts that product from the current 64-bit value in HI:LO.
Forms
msub ,
Operands
$t1- Any general-purpose register,
$0to$31, using its numeric or named spelling, such as$8or$t0($zerois$0;$rais$31). $t2- A general-purpose register. It may be the same register as
$t1.
Use 'mfhi'/'mflo' to read the result.
# Start accumulator at 100, then subtract 6 times 7. Inspect LO: 58.
li $t0, 100
mtlo $t0
mthi $zero
li $t0, 6
li $t1, 7
msub $t0, $t1
mflo $t2