mirror of
https://github.com/logos-storage/plonky2.git
synced 2026-01-22 15:43:09 +00:00
50 lines
1.1 KiB
NASM
50 lines
1.1 KiB
NASM
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// Copies `count` values from
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// SRC = (src_ctx, src_segment, src_addr)
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// to
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// DST = (dst_ctx, dst_segment, dst_addr).
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// These tuple definitions are used for brevity in the stack comments below.
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global memcpy:
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// stack: DST, SRC, count, retdest
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DUP7
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// stack: count, DST, SRC, count, retdest
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ISZERO
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// stack: count == 0, DST, SRC, count, retdest
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%jumpi(memcpy_finish)
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// stack: DST, SRC, count, retdest
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// Copy the next value.
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DUP6
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DUP6
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DUP6
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// stack: SRC, DST, SRC, count, retdest
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MLOAD_GENERAL
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// stack: value, DST, SRC, count, retdest
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DUP4
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DUP4
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DUP4
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// stack: DST, value, DST, SRC, count, retdest
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MSTORE_GENERAL
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// stack: DST, SRC, count, retdest
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// Increment dst_addr.
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SWAP2
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%add_const(1)
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SWAP2
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// Increment src_addr.
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SWAP5
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%add_const(1)
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SWAP5
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// Decrement count.
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SWAP6
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%sub_const(1)
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SWAP6
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// Continue the loop.
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%jump(memcpy)
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memcpy_finish:
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// stack: DST, SRC, count, retdest
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%pop7
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// stack: retdest
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JUMP
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