Skip to content
New issue

Have a question about this project? # for a free GitHub account to open an issue and contact its maintainers and the community.

#

By clicking “#”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? # to your account

Create factorial.s #1

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Create factorial.s #1

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
19 changes: 19 additions & 0 deletions Tests/factorial.s
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
act: addi $1, $0, 1 # initialize reg. 1 to 1
beq $4, $0, return1 # if (n == 0) then goto return1:
bne $4, $1, continue # if (n != 1) then goto continue:
return1: addi $2, $1, 0 # assign result = 1
jr $31 # return
continue: addi $29, $29, -12 # alloc stack space for fp, ra, n
sw $30, 8 ($29) # save frame pointer
sw $31, 4 ($29) # save return address
addi $30, $29, 8 # update frame pointer
sw $4, 0 ($29) # save n
addi $4, $4, -1 # make n-1
jal fact # recursive call to fact(n-1)
lw $4, 0 ($29) # restore n
mult $2, $4 # fact (n-1) * n
mflo $2 # put product in result reg.
lw $31, 4 ($29) # restore return address
lw $30, 8 ($29) # restore frame pointer
addi $29, $29, 12 # restore stack pointer
jr $31 # return