circuitpython/tests/inlineasm/asmbitops.py

@micropython.asm_thumb
def clz(r0):
    clz(r0, r0)

print(clz(0xf0))
print(clz(0x8000))

@micropython.asm_thumb
def rbit(r0):
    rbit(r0, r0)

print(hex(rbit(0xf0)))
print(hex(rbit(0x8000)))