added count-on-bits.s to first lecture

tofergregg · CS107E BOT · commit 9e5a15433d09 · 2025-01-06T17:54:23.000Z
commit 74ee67d69566a402c98e9695307cb1e4d540845e
Author: Chris Gregg &lt;tofergregg@gmail.com&gt;
Date:   Mon Jan 6 09:51:48 2025 -0800

    added count-on-bits.s to first lecture
diff --git a/lectures/RISC-V/code/count-on-bits.s b/lectures/RISC-V/code/count-on-bits.s
@@ -0,0 +1,7 @@
+li a0, 67 # 0x43 or 0b01000111
+li a1, 0
+loop:
+    andi a2, a0, 1
+    add a1, a1, a2
+    srli a0, a0, 1
+    bne a0, x0, loop
