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@micropython.asm_rv32
def asm_sum_words(a0, a1):
# a0 = len
# a1 = ptr
# a2 = sum
# a3 = dummy
li(a2, 0)
jal(zero, loop_entry)
label(loop1)
lw(a3, 0(a1))
add(a2, a2, a3)
addi(a1, a1, 4)
addi(a0, a0, -1)
label(loop_entry)
bne(a0, zero, loop1)
mv(a0, a2)
@micropython.asm_rv32
def asm_sum_bytes(a0, a1):
# a0 = len
# a1 = ptr
# a2 = sum
# a3 = dummy
li(a2, 0)
jal(zero, loop_entry)
label(loop1)
lbu(a3, 0(a1))
add(a2, a2, a3)
addi(a1, a1, 1)
addi(a0, a0, -1)
label(loop_entry)
bne(a0, zero, loop1)
mv(a0, a2)
import 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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