我發現這個樣本SPIM代碼在互聯網上樣品SPIM代碼
.data
COUNT: .word 10
TEXT: .asciiz "The number is "
EOL: .asciiz "\n"
.text
.globl main
main:
addiu $sp, $sp, -32 # Adjust stack
sw $ra, 24($sp)
sw $fp, 16($sp) # save old frame pointer
addiu $fp, $sp, 28 # load new frame pointer
la $t0, COUNT
lw $t1, 0($t0)
li $t0, 0 # init index to 0
loop:
sw $t0, 12($sp) # save caller saved registers
sw $t1, 8($sp) #
move $a0, $t0 # setup parameter for fn call
jal print_num # call subroutine
lw $t1, 8($sp) # restore caller saved values
lw $t0, 12($sp) #
addiu $t0, $t0, 1 # increment index;
blt $t0, $t1, loop #
lw $fp, 16($sp) # restore frame pointer
lw $ra, 24($sp) # restore return address
addiu $sp, $sp, 32 # restore stack pointer
jr $ra
UPDATE
什麼我不能得到的是:如果 函數main需要四個寄存器保存到堆棧($ RA $ FP $ t0 $ t1),它如何爲8個寄存器(32個字節而不是16個字節)分配空間?
感謝您的時間