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https://github.com/micropython/micropython.git
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268acb714d
This commit adds support for writing inline assembler functions when targeting a RV32IMC processor. Given that this takes up a bit of rodata space due to its large instruction decoding table and its extensive error messages, it is enabled by default only on offline targets such as mpy-cross and the qemu port. Signed-off-by: Alessandro Gatti <a.gatti@frob.it>
60 lines
894 B
Python
60 lines
894 B
Python
@micropython.asm_rv32
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def asm_sum_words(a0, a1):
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# a0 = len
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# a1 = ptr
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# a2 = sum
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# a3 = dummy
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li(a2, 0)
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jal(zero, loop_entry)
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label(loop1)
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lw(a3, 0(a1))
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add(a2, a2, a3)
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addi(a1, a1, 4)
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addi(a0, a0, -1)
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label(loop_entry)
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bne(a0, zero, loop1)
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mv(a0, a2)
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@micropython.asm_rv32
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def asm_sum_bytes(a0, a1):
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# a0 = len
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# a1 = ptr
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# a2 = sum
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# a3 = dummy
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li(a2, 0)
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jal(zero, loop_entry)
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label(loop1)
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lbu(a3, 0(a1))
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add(a2, a2, a3)
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addi(a1, a1, 1)
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addi(a0, a0, -1)
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label(loop_entry)
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bne(a0, zero, loop1)
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mv(a0, a2)
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import 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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