在用Python的unittest时，我得到了如下错误：
在汇编测试里，我的代码运行结果是正确的，但s6的地址也发生了变化 （lw 时加载的不是存进去的值）
我想知道是哪里出了问题
以下为我的代码：
.globl dot
.text
# =======================================================
# FUNCTION: Dot product of 2 int vectors
# Arguments:
# a0 (int*) is the pointer to the start of v0
# a1 (int*) is the pointer to the start of v1
# a2 (int) is the length of the vectors
# a3 (int) is the stride of v0
# a4 (int) is the stride of v1
# Returns:
# a0 (int) is the dot product of v0 and v1
# Exceptions:
# - If the length of the vector is less than 1,
# this function terminates the progra,m with error code 57
# - If the stride of either vector is less than 1,
# this function terminates the progra,m with error code 58
# =======================================================
#a0:size a1:time return a0
multi:
add t1 a0 x0
bne a1 zero loop
mv a0 zero
j mul_end
loop:
addi a1 a1 -1
ble a1 zero mul_end
add a0 a0 t1
j loop
mul_end:
jalr zero ra 0
#ret a0; arg:a0,a1 find max value
max:
bge a0, a1, max_return # if a0 > a1 then max_return
mv a0 a1
max_return:
jalr zero ra 0
dot:
addi sp sp -30
sw s0 0(sp)
sw s1 4(sp)
sw s2 8(sp)
sw s3 12(sp)
sw s4 16(sp)
sw s5 20(sp)
sw s6 24(sp)
sw ra, 26(sp)
# Prologue
ble a2, zero, error_len # if a2 <= zero then err
ble a3, zero, error_str
ble a4, zero, error_str
jal zero loop_prepare
error_len:
li a1 57
call exit2
error_str:
li a1 58
call exit2
loop_prepare:
#s0 - firstAdd
#s1 - secAdd
#s2 - firStr
#s3 - secStr
#s4 - largestStr
#s5 - vecInd
#s6 - sum
mv s0 a0
mv s1 a1
mv s5 a2
li a0 4
mv a1 a3
jal ra, multi
mv s2 a0
li a0 4
mv a1 a4
jal ra, multi
mv s3 a0
mv a0 a3
mv a1 a4
jal ra, max
mv s4 a0
li s6 0
loop_start:
lw a0 0(s0)
lw a1 0(s1)
jal ra, multi
add s6 s6 a0
loop_continue:
sub s5 s5 s4
ble s5 zero loop_end
add s0 s0 s2
add s1 s1 s3
j loop_start
loop_end:
mv a0 s6
lw s0 0(sp)
lw s1 4(sp)
lw s2 8(sp)
lw s3 12(sp)
lw s4 16(sp)
lw s5 20(sp)
lw s6 24(sp)
lw ra, 26(sp)
addi sp sp 30
# Epilogue
jr ra
ps:感觉测试有个小坑
在变量表述中：a2 应该是2个数组的长度
但stride_test里，步长大的到了数组外依旧可以运算，以至于结果为22
实际上应该为7