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https://github.com/logos-storage/plonky2.git
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43 lines
1.6 KiB
Rust
43 lines
1.6 KiB
Rust
//! Byte packing registers.
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use core::ops::Range;
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use crate::byte_packing::NUM_BYTES;
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/// 1 if this is a READ operation, and 0 if this is a WRITE operation.
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pub(crate) const IS_READ: usize = 0;
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pub(super) const LEN_INDICES_START: usize = IS_READ + 1;
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// There are `NUM_BYTES` columns used to represent the length of
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// the input byte sequence for a (un)packing operation.
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// index_len(i) is 1 iff the length is i+1.
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pub(crate) const fn index_len(i: usize) -> usize {
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debug_assert!(i < NUM_BYTES);
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LEN_INDICES_START + i
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}
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// Note: Those are used to obtain the length of a sequence of bytes being processed.
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pub(crate) const LEN_INDICES_COLS: Range<usize> = LEN_INDICES_START..LEN_INDICES_START + NUM_BYTES;
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pub(crate) const ADDR_CONTEXT: usize = LEN_INDICES_START + NUM_BYTES;
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pub(crate) const ADDR_SEGMENT: usize = ADDR_CONTEXT + 1;
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pub(crate) const ADDR_VIRTUAL: usize = ADDR_SEGMENT + 1;
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pub(crate) const TIMESTAMP: usize = ADDR_VIRTUAL + 1;
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// 32 byte limbs hold a total of 256 bits.
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const BYTES_VALUES_START: usize = TIMESTAMP + 1;
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// There are `NUM_BYTES` columns used to store the values of the bytes
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// that are being read/written for an (un)packing operation.
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pub(crate) const fn value_bytes(i: usize) -> usize {
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debug_assert!(i < NUM_BYTES);
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BYTES_VALUES_START + i
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}
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/// The counter column (used for the range check) starts from 0 and increments.
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pub(crate) const RANGE_COUNTER: usize = BYTES_VALUES_START + NUM_BYTES;
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/// The frequencies column used in logUp.
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pub(crate) const RC_FREQUENCIES: usize = RANGE_COUNTER + 1;
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/// Number of columns in `BytePackingStark`.
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pub(crate) const NUM_COLUMNS: usize = RANGE_COUNTER + 2;
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