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@micropython.asm_thumb
def asm_sum_words(r0, r1):
# r0 = len
# r1 = ptr
# r2 = sum
# r3 = dummy
mov(r2, 0)
b(loop_entry)
label(loop1)
ldr(r3, [r1, 0])
add(r2, r2, r3)
add(r1, r1, 4)
sub(r0, r0, 1)
label(loop_entry)
cmp(r0, 0)
bgt(loop1)
mov(r0, r2)
@micropython.asm_thumb
def asm_sum_bytes(r0, r1):
# r0 = len
# r1 = ptr
# r2 = sum
# r3 = dummy
mov(r2, 0)
b(loop_entry)
label(loop1)
ldrb(r3, [r1, 0])
add(r2, r2, r3)
add(r1, r1, 1)
sub(r0, r0, 1)
label(loop_entry)
cmp(r0, 0)
bgt(loop1)
mov(r0, r2)
import uarray as array
b = array.array('l', (100, 200, 300, 400))
n = asm_sum_words(len(b), b)
print(b, n)
b = array.array('b', (10, 20, 30, 40, 50, 60, 70, 80))
n = asm_sum_bytes(len(b), b)
print(b, n)
b = b'\x01\x02\x03\x04'
n = asm_sum_bytes(len(b), b)
print(b, n)
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