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authorSanto Cariotti <dcariotti24@gmail.com>2020-06-08 19:55:38 +0200
committerSanto Cariotti <dcariotti24@gmail.com>2020-06-08 19:55:38 +0200
commitd8dd8f916b1e6ca9756a0643c7a0d4cd3461e92c (patch)
tree94e06995533f0e0e4bba8f81dd1bbcd856d176a8
parent317a35795dae5533a9e012f978c731dfb80faddf (diff)
feat: add exercise
Count number of ones in a number
-rw-r--r--I_anno/Architettura_Elaboratori/num_of_1s.asm20
1 files changed, 20 insertions, 0 deletions
diff --git a/I_anno/Architettura_Elaboratori/num_of_1s.asm b/I_anno/Architettura_Elaboratori/num_of_1s.asm
new file mode 100644
index 0000000..ffbd4f4
--- /dev/null
+++ b/I_anno/Architettura_Elaboratori/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