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| author | Santo Cariotti <santo@dcariotti.me> | 2021-02-06 19:56:36 +0100 |
|---|---|---|
| committer | Santo Cariotti <santo@dcariotti.me> | 2021-02-06 19:56:36 +0100 |
| commit | d2edbc38cac8da52f58c5cd3da6c0c625fa05736 (patch) | |
| tree | a51e9a4e56fc9d4c7c9e37576dceedca3a0c72b4 /Year_1/Computer_Architecture/num_of_1s.asm | |
| parent | 98f34040820dc3a964b7be59a698323e8cc6c8a3 (diff) | |
conf: rename
Diffstat (limited to 'Year_1/Computer_Architecture/num_of_1s.asm')
| -rw-r--r-- | Year_1/Computer_Architecture/num_of_1s.asm | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Year_1/Computer_Architecture/num_of_1s.asm b/Year_1/Computer_Architecture/num_of_1s.asm new file mode 100644 index 0000000..ffbd4f4 --- /dev/null +++ b/Year_1/Computer_Architecture/num_of_1s.asm @@ -0,0 +1,20 @@ +num dcd 27 ; 0b11011 + + mov r0, #num + ldr r0, [r0] + mov r2, r0 + + mov r1, #32 + +loop + and r4, r2, #1 + cmp r4, #1 + bne itszero + add r3, r3, #1 +itszero + lsr r2, r2, #1 + sub r1, r1, #1 + cmp r1, #0 + bne loop + + end |