help

[Hai Huang <hai@mathpost.la.asu.edu>]

hi, MIPS gurus. :) i encounter a problem on MIPS in my computer
architecture course. it requires to use 3 MIPS instructions to implement
absolute value. 

abs $t2, $t3

$t3 is a number, if $t3<0, then $t2 is $t3's 2's complement, otherwise,
$t2=$t3. i can do it in four instructions.

    add $t2, zero, $t3
    slt $at, $t3, zero
    beq $at, zero, OUT
    sub $t2, zero, $t2
OUT:

but i don't know how to use three. this problem borthers me for several
days. could you help me? thanks a lot. :)

hai

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Hai Huang
Arizona State University                 Phone: (480) 449-9490 (H)
Computer Science & Engineering Department
Tempe, AZ 85287                          email: hai@asu.edu
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