Assume that your ultra-low-cost processor doesn't have the hardware budget for an integer multiplier implemented in HW, and you don't need 64-bit multiplication results, but you do need 32-bit multiplication results to do some address computations (i.e. you only need a multiplier that returns a 32-bit result, even given two 32-bit inputs) In the SW emulation of multiplication $a0, $a1 below, : mstart: xor $v®, $v®, $v® mloop: andi $t®, $a1, 1 $t0, $Ø, $t® and $t1, $a®, $t® add $v®, $v®, $t1 sll $a1, $a1, 1 srl $a®, $a®, 1 bne $a1, $0, mloop what instruction, when put in the blue box, would correctly implement unsigned multiplication $vO = $a0 * $a1? %3D sub mul add beq O o o

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Assume that your ultra-low-cost processor doesn't have the hardware budget for an
integer multiplier implemented in HW, and you don't need 64-bit multiplication
results, but you do need 32-bit multiplication results to do some address
computations (i.e. you only need a multiplier that returns a 32-bit result, even given
two 32-bit inputs)
In the SW emulation of multiplication $a0, $a1 below, :
mstart:
xor $v®, $v0, $v®
mloop: andi $t®, $a1, 1
$t0, $Ø, $tØ
and $t1, $a®, $t®
add $v®, $v0, $t1
sll $a1, $a1, 1
srl $a®, $a0, 1
bne $a1, $0, mloop
what instruction, when put in the blue box, would correctly implement unsigned
multiplication $vO = $aO * $a1?
%3D
sub
mul
add
beq
o ooo
Transcribed Image Text:Assume that your ultra-low-cost processor doesn't have the hardware budget for an integer multiplier implemented in HW, and you don't need 64-bit multiplication results, but you do need 32-bit multiplication results to do some address computations (i.e. you only need a multiplier that returns a 32-bit result, even given two 32-bit inputs) In the SW emulation of multiplication $a0, $a1 below, : mstart: xor $v®, $v0, $v® mloop: andi $t®, $a1, 1 $t0, $Ø, $tØ and $t1, $a®, $t® add $v®, $v0, $t1 sll $a1, $a1, 1 srl $a®, $a0, 1 bne $a1, $0, mloop what instruction, when put in the blue box, would correctly implement unsigned multiplication $vO = $aO * $a1? %3D sub mul add beq o ooo
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