您好我正在尝试用汇编语言完成一个函数，该函数计算一维数组中的负数和非负数。我相信我已经正确编写了大部分代码但由于某种原因逐步运行它会让我相信我的“count（）”函数甚至没有被实现，因为存储负数和非负数的寄存器当我在MARS中运行代码时，永远不会增加。任何建议或帮助将不胜感激。
伪随机数生成器seed = 1234应该创建一个67个负数和33个非负整数的数组。
#========================================================================================
# Equivalents for MARS System Calls
#========================================================================================
.eqv SYS_EXIT 10
.eqv SYS_PRINT_CHAR 11
.eqv SYS_PRINT_INT 1
.eqv SYS_PRINT_STR 4
.eqv SYS_RAND_INT_RNG 42
.eqv SYS_READ_INT 5
.eqv SYS_SET_SEED 40
#========================================================================================
# Data Section
#
# Contains global data for the program.
#========================================================================================
.data
s_neg: .asciiz "Number of negative ints: "
s_nonneg: .asciiz "Number of non-negative ints: "
#========================================================================================
# Text Section
#
# Contains instructions for the program.
#========================================================================================
.text
main:
addi $sp, $sp, -524 # Allocate 131 words in stack frame
# SysSetSeed(1, 1234)
addi $v0, $zero, SYS_SET_SEED # $v0 = SysSetSeed service code
addi $a0, $zero, 1 # $a0 = pseudorandom number generator id
addi $a1, $zero, 1234 # $a1 = seed
syscall # SysSetSeed(1, 1234)
# for i = ...
sw $zero, 512($sp) # i = 0
addi $t9, $zero, 127 # $t9 = index of last element of a
addi $t8, $zero, 500 # $t8 = constant 500
main_loop_begin:
lw $t0, 512($sp) # $t0 = i
bgt $t0, $t9, main_loop_end # if i > 127 drop out of loop
# a[i] = SysRandInt(1, 1000) - 500
addi $v0, $zero, SYS_RAND_INT_RNG # $v0 = SysRandInt service code
addi $a0, $zero, 1 # $a0 = pseudorandom number generator id
addi $a1, $zero, 1000 # $a1 = upper limit of range [0, 1000]
syscall # SysRandInt(1, 1000)
sub $t1, $a0, $t8 # $a0 = SysRandInt(1, 1000) - 500
sll $t0, $t0, 2 # $t0 = 4i
add $t0, $sp, $t0 # $t0 = a + 4i = &a[i]
sw $t1, 0($t0) # a[i] = SysRandInt(1, 1000) - 500
# i = i + 1
lw $t0, 512($sp) # $t0 = i
addi $t0, $t0, 1 # $t0 = i + 1
sw $t0, 512($sp) # i = i + 1
j main_loop_begin # continue looping
main_loop_end:
move $a0, $sp # $a0 = &a
jal count # Call count(a)
sw $v0, 516($sp) # neg = first return value
sw $v1, 520($sp) # nonneg = second return value
# SysPrintStr ("Number of negative ints: ")
addi $v0, $zero, SYS_PRINT_STR # $v0 = SysPrintStr service code
la $a0, s_neg # $a0 = address of string to be printed
syscall # Call SysPrintStr(...)
# SysPrintInt (neg)
addi $v0, $zero, SYS_PRINT_INT # $v0 = SysPrintInt service code
lw $a0, 516($sp) # $a0 = neg
syscall # SysPrintInt(neg)
# SysPrintChar('\n')
addi $v0, $zero, SYS_PRINT_CHAR # $v0 = SysPrintChar service code
addi $a0, $zero, '\n' # $a0 = '\n'
syscall # SysPrintChar('\n')
# SysPrintStr ("Number of non-negative ints: ")
addi $v0, $zero, SYS_PRINT_STR # $v0 = SysPrintStr service code
la $a0, s_nonneg # $a0 = address of string to be printed
syscall # Call SysPrintStr(...)
# SysPrintInt (nonneg)
addi $v0, $zero, SYS_PRINT_INT # $v0 = SysPrintInt service code
lw $a0, 520($sp) # $a0 = nonneg
syscall # SysPrintInt(nonneg)
# SysPrintChar('\n')
addi $v0, $zero, SYS_PRINT_CHAR # $v0 = SysPrintChar service code
addi $a0, $zero, '\n' # $a0 = '\n'
syscall # SysPrintChar('\n')
# Call SysExit()
addi $sp, $sp, 524 # Deallocate stack frame
addi $v0, $zero, SYS_EXIT # $v0 = SysExit service code
syscall # Call SysExit()
#----------------------------------------------------------------------------------------
# count() -
#----------------------------------------------------------------------------------------
count:
jr $ra
# int i = 0;
addi $sp, $sp, -512 # Allocate 128 words in stack frame: i at 0($sp), $a0 at 4($sp)
sw $a0, 4($sp) # Save $a0 (param string) in stack frame
sw $zero, 0($sp) # Initialize i in stack frame to 0
li $t5, 0
# int neg = 0;
li $t2, 0
# int nonneg = 0;
li $t3, 0
li $t7, 128 #loads t7 with the size of the array
begin_loop:
beq $a0, $t7, end_loop #if last
lw $t4, 0($s0)
# if i ← n + 1 goto end_loop
bgt $t5, $t7, end_loop
# if arrayi >= 0 jumps to else 1 or neg + 1
bge $a0,$0, else1 #$a0 holds arrayi
addi $t2, $t2, 1
# ++i;
lw $t5, 0($sp) # $t0 = i
addi $t5, $t0, 1 # $t0 = i + 1
sw $t5, 0($sp) # ++i
j begin_loop #$t0 holds neg and adds 1
else1:
# else nonneg + 1
addi $t3, $t3, 1 #$t1 holds nonneg and adds 1
# ++i;
lw $t5, 0($sp) # $t0 = i
addi $t5, $t0, 1 # $t0 = i + 1
sw $t5, 0($sp) # ++i
# goto begin_loop
j begin_loop # Continue looping
end_loop:
addi $sp, $sp, 8 # Deallocate stack frame
# return neg, nonneg
move $t2, $v0 #
move $t3, $v1
jr $ra # Return
# end function