2020-11-24 07:37:58 -05:00
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# Miscellaneous viper tests
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2023-02-01 03:08:41 -05:00
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2020-11-24 07:37:58 -05:00
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# Test correct use of registers in load and store
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@micropython.viper
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def expand(dest: ptr8, source: ptr8, length: int):
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n = 0
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for x in range(0, length, 2):
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c = source[x]
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d = source[x + 1]
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dest[n] = (c & 0xE0) | ((c & 0x1C) >> 1)
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n += 1
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dest[n] = ((c & 3) << 6) | ((d & 0xE0) >> 4)
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n += 1
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dest[n] = ((d & 0x1C) << 3) | ((d & 3) << 2)
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n += 1
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source = b"\xaa\xaa\xff\xff"
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dest = bytearray(len(source) // 2 * 3)
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expand(dest, source, len(source))
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print(dest)
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