Question
# File: mlRemoveBlanks # Author: ************ # Date: mm/dd/yyyy # Purpose: Practice rotate & AND to remove spare blanks #-------------------------------------------------------------- # Write a MIPS assembler
# File: mlRemoveBlanks
# Author: ************
# Date: mm/dd/yyyy
# Purpose: Practice rotate & AND to remove spare blanks
#--------------------------------------------------------------
# Write a MIPS assembler program to remove the extra blanks from
# a string:
# INPUT: "Two bee ore knot too Bea that"
# PATTERN:00011000100011000010001100010000
# ROTATE: 00110001000110000100011000100000
# AND: 00010000000010000000001000000000
# RESULT:"Two bee ore knot too Bea that "
.data
.eqv SYS_PRINT_WORD 1 #word, byte, character
.eqv SYS_PRINT_FLOAT 2 #float
.eqv SYS_PRINT_DOUBLE 3 #double
.eqv SYS_PRINT_TEXT 4 #text (zero terminated)
.eqv SYS_INPUT_WORD 5 #input word
.eqv SYS_INPUT_FLOAT 6 #input float
.eqv SYS_PRINT_BIN 35 #print binary
.eqv SYS_EXIT 10 #terminate
# declare variables
.eqv BLANK 32
#12345678901234567890123456789012
text: .ascii "Two bee ore knot too Bea that"
end_text: .asciiz " "
result: .ascii " "
end_result: .asciiz " "
blank: .byte ' '
endl: .asciiz " "
endl2: .asciiz " "
.text
.globl main
main:
# Print starting text
la $a0, text
li $v0, SYS_PRINT_TEXT
syscall
# ----------------------------------------------------------------
# Create the bit pattern with a 1 where each blanks exists
# ----------------------------------------------------------------
# s7 = ending address for loop
# s1 = text address
# s0 = the bit pattern
loop1:
# shift pattern left
# get 'text' byte
# compare with BLANK
# set s0 bit0 for BLANK, else skip to noBlank, not setting bit0
noBlank:
# move to next character
# loop1 if not done (s1 != s7)
# print s0 pattern
# ----------------------------------------------------------------
# Duplicate bit pattern, Rotate left, AND the two patterns
# should be where extra blanks exist
# ----------------------------------------------------------------
# duplicate s0 pattern into s2
# rotate s2 left one bit
# print s2 rotate
# AND the two patterns: s2 & s0
# print the AND pattern
# ----------------------------------------------------------------
# Copy 'text' into 'result' for each zero bit in s3 pattern
# ----------------------------------------------------------------
# ending s7 'end_text' address
# source address 'text' in s0
# destination address 'result' in s1
loop2:
# rotate high bit to bit0
# test bit0
# skip if bit0 is 1
# get character at (s0)
# save character in (s1)
# advance s1 'result' address
skip:
# advance s0 'text' address
# loop2 if not done (s0 != s7)
# print 'result'
#---- terminate ---
exit:
li $v0, SYS_EXIT
syscall
#.end main
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