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