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CDA 3100

CDA 3100. Recitation Week 7. Write a Complete MIPS Program. For each array element i , find the min(array0[i], array1[i]) and store it into array2[i] array0, array1, and array2 store floating point numbers Each array holds 5 elements array0 holds [0.6, 0.7, 0.9, 0.1, -0.8]

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CDA 3100

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  1. CDA 3100 Recitation Week 7

  2. Write a Complete MIPS Program • For each array element i, find the min(array0[i], array1[i]) and store it into array2[i] • array0, array1, and array2 store floating point numbers • Each array holds 5 elements • array0 holds [0.6, 0.7, 0.9, 0.1, -0.8] • array1 holds [0.8, 1.9, 11.2, -0.19, 0.7]

  3. Some useful instructions • swc1 $f0, 0($t0) • Store floating point number into address • lwc1 $f0, 0($t0) • Load address as floating point number • s.s $f0, 0($t0) • Store floating point number into address • l.s $f0, 0($t0) • Load address as floating point number • mov.s $f0, $f1 • Copy a floating point number • c.lt.s $f0, f1 • If $f0 < $f1, a flag that can be used for jumps is triggered • bc1t L1 • Branch to L1 if flag is set • jalFunc • Go to a function • jr $ra • Return from function

  4. Answer (1) .data array0: .float 0.6, 0.7, 0.9, 0.1, -0.8 array1: .float 0.8, 1.9, 11.2, -0.19, 0.7 array2: .space 20 msg_newline: .asciiz “\n” .text .globl main

  5. Answer (2) main: la $a0, array0 la $a1, array1 la $a2, array2 li $a3, 5 jalfloatArray done: addi $t0, $a2, 0 addi $t1, $0, 0

  6. Answer (3) loop: li $v0, 2 l.s $f12, 0($t0) syscall li $v0, 4 la $a0, msg_newline syscall addi $t0, $t0, 4 addi $t1, $t1, 1 blt $t1, $a3, loop exit: li $v0,10 syscall

  7. Answer (4) floatArray: addi $sp, $sp, -12 swc1 $f0, 8($sp) swc1 $f1, 4($sp) swc1 $f2, 0($sp) addi $t0, $a0, 0 addi $t1, $a1, 0 addi $t2, $a2, 0 addi $t9, $0, 0

  8. Answer (5) floatArrayloop: l.s $f0, 0($t0) l.s $f1, 0($t1) c.lt.s $f0, $f1 bc1t floatArrayskip mov.s $f0, $f1

  9. Answer (6) floatArrayskip: s.s $f0, 0($t2) addi $t0, $t0, 4 addi $t1, $t1, 4 addi $t2, $t2, 4 addi $t9, $t9, 1 blt $t9, $a3, floatArrayloop lwc1 $f0, 8($sp) lwc1 $f1, 4($sp) lwc1 $f2, 0($sp) addi $sp, $sp, 12 jr $ra

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