mirror of
https://github.com/logos-storage/plonky2.git
synced 2026-01-10 01:33:07 +00:00
48 lines
1.4 KiB
NASM
48 lines
1.4 KiB
NASM
// Methods for encoding integers as bytes in memory, as well as the reverse,
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// decoding bytes as integers. All big-endian.
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global mload_packing:
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// stack: context, segment, offset, len, retdest
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// TODO
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// stack: value
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// Pre stack: context, segment, offset, value, len, retdest
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// Post stack: (empty)
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global mstore_unpacking:
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// stack: context, segment, offset, value, len, retdest
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// We will enumerate i in (32 - len)..32.
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// That way BYTE(i, value) will give us the bytes we want.
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DUP5 // len
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PUSH 32
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SUB
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mstore_unpacking_loop:
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// stack: i, context, segment, offset, value, len, retdest
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// If i == 32, finish.
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DUP1
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%eq_const(32)
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%jumpi(mstore_unpacking_finish)
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// stack: i, context, segment, offset, value, len, retdest
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DUP5 // value
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DUP2 // i
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BYTE
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// stack: value[i], i, context, segment, offset, value, len, retdest
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DUP5 DUP5 DUP5 // context, segment, offset
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// stack: context, segment, offset, value[i], i, context, segment, offset, value, len, retdest
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MSTORE_GENERAL
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// stack: i, context, segment, offset, value, len, retdest
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// Increment offset.
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SWAP3 %add_const(1) SWAP3
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// Increment i.
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%add_const(1)
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%jump(mstore_unpacking_loop)
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mstore_unpacking_finish:
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// stack: i, context, segment, offset, value, len, retdest
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%pop6
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// stack: retdest
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JUMP
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