此项目中介绍了MIPS程序集中的浮点数。
发布了许多FPGA / Verilog / VHDL，今天我想发布一个MIPS组装项目。 MIPS是许多大学都在教授的非常常见的微处理器，并且有许多基于提供的指令集实现MIPS处理器的FPGA / Verilog / VHDL项目。实施MIPS之后，我们可以通过将MIPS汇编代码下载到指令存储器中来对MIPS进行编程。
这是一个非常简单的MIPS汇编代码，供学生玩浮点数。使用的模拟器是Qtspim，对于MIPS架构的指令集，您可以访问 这里。用户将输入八个浮点数，程序将查找所输入浮点数的最小，最大和平均数。
输出控制台如下：
用于浮点数运算的MIPS汇编代码：
.data buffer: .space 50 name: .asciiz "REPLACE THIS WITH YOUR NAME" enter_number: .asciiz "Enter your number: " number_out: .asciiz "Your numbers are: " newline: .asciiz "\n" blank: .asciiz " " max_print: .asciiz "The max is: " min_print:.asciiz "The min is: " av_print: .asciiz "The average is: " .text .globl main getvalues: # Name: getvalues # Input parameters: $a0, address of the array to store values # Return values: $v0 = the number of values input by the user # Description: This procedure will prompt the user to enter values and store them in an array. # All values given will be positive. The procedure will return once eight values have been entered # or if the user inputs a zero. The number of elements input (either 8 or less than 8) will be # returned in $v0. addi $t2,$a0,0 addi $t3,$a0,32 la $a0,name li $v0, 4 # print string (address of string already in $a0) syscall # do it la $a0,newline li $v0, 4 # print string (address of string already in $a0) syscall # do it loop_in: la $a0,enter_number li $v0, 4 # print string (address of string already in $a0) syscall # do it li $v0, 6 # read float syscall # do it mfc1 $t1, $f0 beq $t1,$zero,ret_fr_in sw $t1,0($t2) addi $t2,$t2,4 beq $t2,$t3,ret_fr_in j loop_in ret_fr_in: la $a0,buffer sub $t2,$t2,$a0 addi $t1,$zero,4 div $t2,$t1 mflo $t2 addi $v0,$t2,0 jr $ra # return, result is already in $v0 print: # Name: print # Input parameters: $a0, address of the array containing input values # $a1, the number of valid values in the array # Return values: none # Description: This procedure will print all valid elements entered by the user addi $t0,$a0,0 addi $t1,$zero,4 mult $a1,$t1 mflo $a1 add $t4,$a1,$a0 la $a0,number_out li $v0, 4 # print syscall # do it la $a0,newline li $v0, 4 # print string (address of string already in $a0) syscall # do it loop_print: lw $t1,0($t0) mtc1 $t1, $f12 li $v0, 2 # print float in $f12 syscall # do it la $a0,blank li $v0, 4 # print syscall # do it addi $t0,$t0,4 bne $t0,$t4,loop_print la $a0,newline li $v0, 4 # print string (address of string already in $a0) syscall # do it jr $ra # return max: # Name: max # Input parameters: $a0, address of the array containing input values # $a1, the number of valid values in the array # Return values: $f0 = the greatest element input # Description: This procedure will return the greatest value input by the user addi $t1,$a0,0 addi $t5,$zero,4 mult $a1,$t5 mflo $a1 add $t4,$a1,$a0 # $f0 = max lw $t0,0($t1) # max = a[0] mtc1 $t0,$f0 next_max: addi $t1,$t1,4 beq $t1,$t4,ret_fr_max lw $t0,0($t1) mtc1 $t0,$f1 c.le.s $f0, $f1 bc1t new_max nop j next_max ret_fr_max: jr $ra # return new_max: mov.s $f0, $f1 j next_max min: # Name: min # Input parameters: $a0, address of the array containing input values # $a1, the number of valid values in the array # Return values: $f0 = the smallest element input # Description: This procedure will return the smallest value input by the user addi $t1,$a0,0 addi $t5,$zero,4 mult $a1,$t5 mflo $a1 add $t4,$a1,$a0 # $f0 = min lw $t0,0($t1) # min = $f0 mtc1 $t0,$f0 next_min: addi $t1,$t1,4 beq $t1,$t4,ret_fr_min lw $t0,0($t1) mtc1 $t0,$f1 c.le.s $f1, $f0 bc1t new_min nop j next_min ret_fr_min: jr $ra # return new_min: mov.s $f0, $f1 j next_min average: # Name: average # Input parameters: $a0, address of the array containing input values # $a1, the number of valid values in the array # Return values: $f0 = the average of all elements input by the user # Description: This procedure will return the average of all elements input by the user. addi $t1,$a0,0 addi $t5,$zero,4 mult $a1,$t5 mflo $t6 add $t4,$t6,$a0 # $f0 = aver lw $t0,0($t1) # aver = $f0 mtc1 $t0,$f0 next_aver: addi $t1,$t1,4 beq $t1,$t4,ret_fr_aver lw $t0,0($t1) mtc1 $t0,$f1 add.s $f0,$f0,$f1 j next_aver ret_fr_aver: addi $t0,$a1,0 mtc1 $t0,$f1 cvt.s.w $f2, $f1 div.s $f0, $f0, $f2 jr $ra # return # MAIN PROGRAM main: la $a0, buffer jal getvalues la $a0, buffer addi $a1,$v0,0 addi $a2,$v0,0 jal print la $a0,max_print li $v0, 4 # print syscall # do it la $a0, buffer addi $a1,$a2,0 jal max mov.s $f12,$f0 li $v0,2 syscall # do it la $a0,newline li $v0, 4 # print string (address of string already in $a0) syscall # do it la $a0,min_print li $v0, 4 # print syscall # do it la $a0, buffer addi $a1,$a2,0 jal min mov.s $f12,$f0 li $v0,2 syscall # do it la $a0,newline li $v0, 4 # print string (address of string already in $a0) syscall # do it la $a0,av_print li $v0, 4 # print syscall # do it la $a0, buffer addi $a1,$a2,0 jal average mov.s $f12,$f0 li $v0,2 syscall # do it ori $v0, $zero, 10 #syscall will exit syscall #exit
您可能会这样：
如何输入10个数字？
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删除运行此代码时出现错误
回复删除在loop_in的此语句中：
sw $t1,0($t2)
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