spec v0.2#370
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See the original yetanotherco/lambda_vm_spec #1 for more details, if it still exists. * Introduce `config` and "variables" * chip column-to-table rendering * restructuring * some basic interactions idea * Sample lt chip design * Update formatting * Interpret variable indexing * BRANCH draft * Fix indexing + render template * Render labels for references to constraints * Rendering chip assumptions * Add an editorconfig for consistency in indentation and trailing newlines * The constraint range index found its way back home * Finish (?) LT chip * Improve lisp rendering * support constraint group rendering * Support "^" type setting * dvrm * add dvrm assumptions * Rendering virtual column definitions and polynomials for arith constraints * ignore ebook.pdf * Split LT and BRANCH into groups * Nicer mutual recursion in expression formatting * Use negation instead of mult by -1 in lt * Format expr.typ * Simplify subtraction expression * Remove parentheses using precedence rules * fmt * improve dvrm readability * fix lt parentheses * move `extended_n_sub_r` def from constraint to var * Set div chip word types to HL * divrem fixes * more dvrm tweaks * Specify grammar * add docs * Drop chip files * Improve `chip` readability * minor fixes --------- Co-authored-by: Erik Takke <erik.takke@3milabs.tech>
This fixes the following pain points: - Assumptions and constraints requiring a `ref` for rendering to succeed - The `desc` field of `arith` constraints not being rendered - The `constraint` field of an `arith` constraint using eval in code mode - Long tables (columns and constraints) didn't break across pages - Template constraints did not have conditions rendered - Constraint groups didn't get the proper prefix if specified - The default branch of expression rendering has missing arguments It also introduces a nice visual todo macro --------- Co-authored-by: Erik <159244975+erik-3milabs@users.noreply.github.com>
Support array-like variable types. Typed as: ```toml [[variables.auxiliary]] name = "var" type = ["Bit", 5] desc = "five bits" ``` --------- Co-authored-by: Robin Jadoul <robin.jadoul@3milabs.tech>
Updated definition rendering: * definitions are only allowed for virtual variables * definitions are now labelled with `def` rather than `poly` or `polys` * more flexible definitions possible for array-type virtuals.
* spec: update `description` printing * spec: update `polynomial constraint` printing
* spec: Initial CPU version to handle RV64IMC * Address review comments * Add word_instr as input to SHIFT --------- Co-authored-by: Erik <159244975+erik-3milabs@users.noreply.github.com>
* spec: init BRANCH chip * Small cleanup * Clean up variable naming and generally address review comments * outdated comment --------- Co-authored-by: Erik Takke <erik.takke@3milabs.tech>
* spec: conditionally render constraint table headers * spec: simplify `selected_constraints` expression * spec: repurpose `selected_constraints`
…s in one document (#108)
Co-authored-by: Erik Takke <erik.takke@3milabs.tech>
* spec: rough draft SHIFT chip * various minor fixes * implement right-limb shifting * Update rendering "polynomial constriant" in table * fix degree 4 issues * Further update to SHIFT chip * Clean up SHIFT * spec/shift: add assumption * spec/shift: Add lookup constraint * spec/shift: make extension virtual Kudos to Robin for uncovering this! * spec/shift: Simplify limb-situation Kudos to Robin for pointing this out! * spec/SHIFT: fix typo * Turn `limb_shift_x` into array * spec: support "sum" expression in math * Simplify limb-shifting constraint * spec: attempt at refactoring `shift` * spec: overhaul SHIFT * spec: SHIFT: rename `extensions` as `extension` Co-authored-by: Robin Jadoul <robin.jadoul@3milabs.tech> * spec: SHIFT: make `shift` of type Byte * spec: SHIFT: replace variable '0x' with constant 0x * spec: SHIFT: remove "cheaper" remark * spec: SHIFT: fix `shifted` description * spec: SHIFT: make output a DWordWL * spec: SHIFT * spec: SHIFT: introduce explanation; update some constraint elaborations * Apply suggestions from the code review Co-authored-by: Robin Jadoul <robin.jadoul@3milabs.tech> * spec: SHIFT: update `bits_shift` desc * spec: SHIFT: update `limb_shift` desc * spec: SHIFT: add missing IS_BIT constraint for limb_shift * spec: SHIFT: update description * spec: SHIFT: fix sum's expr-to-math * Minor language pass Co-authored-by: Robin Jadoul <robin.jadoul@3milabs.tech> --------- Co-authored-by: Robin Jadoul <robin.jadoul@3milabs.tech>
* spec: ADD draft * spec: ADD: fix `carry` size * spec: ADD: clarify sum is mod 2^64 * spec: introduce `SUB` template notation. * Fix assumption indices Co-authored-by: Robin Jadoul <robin.jadoul@3milabs.tech> * Fix typos Co-authored-by: Robin Jadoul <robin.jadoul@3milabs.tech> --------- Co-authored-by: Robin Jadoul <robin.jadoul@3milabs.tech>
* spec: support "sum" expression * spec: introduce "QuadHL" type * spec: introduce MUL chip * spec: Introduce QuadWL * spec: introduce B20[4] * spec: simplify MUL to 26 columns * spec: Fix expr-sum bug * spec: simplify MUL to 22 columns * spec: improve MUL readability * spec: MUL: fix indexing * spec: MUL: refactor * spec: drop B20 * spec: MUL: fix raw_product relation * spec: MUL: fix IS_B19 check range Co-authored-by: Robin Jadoul <robin.jadoul@3milabs.tech> * spec: MUL: add missing res range check assumption * spec: MUL: remove superfluous/invalid constraints * spec: MUL: leverage SIGN template * spec: MUL: fix index mistake * spec: MUL: update description * spec: permit non-constant exponents * spec: MUL: drop `limb_product` * spec: MUL: minor tweaks * spec: MUL: bump headers * spec: MUL: update description * spec: MUL: update to IS_B20 * spec: MUL: remove 'eloquent' * Apply suggestions from code review Thanks Robin! Co-authored-by: Robin Jadoul <robin.jadoul@3milabs.tech> * spec: MUL: define padding --------- Co-authored-by: Robin Jadoul <robin.jadoul@3milabs.tech>
Co-authored-by: Erik <159244975+erik-3milabs@users.noreply.github.com>
Co-authored-by: Erik <159244975+erik-3milabs@users.noreply.github.com>
* spec/memw: read/write from/to -> read from/write to * spec/memw: rename add_limb_overflow as carry * spec/memw: minor var desc updates * spec/memw: remove superfluous minus symbol * spec/memw: update description * spec/memw_a: minor optimization * Apply suggestions from code review Co-authored-by: Robin Jadoul <robin.jadoul@gmail.com> * spec/MEMW: fix interaction typing * spec/MEMW: drop superfluous notes * spec/MEMW: update alignment requirement * spec/MEMW: intentionally separate carry's prose and .toml descriptions --------- Co-authored-by: Robin Jadoul <robin.jadoul@gmail.com>
* spec/memw: read/write from/to -> read from/write to * spec/memw: rename add_limb_overflow as carry * spec/memw: minor var desc updates * spec/memw: remove superfluous minus symbol * spec/memw: update description * spec/memw_a: minor optimization * Apply suggestions from code review Co-authored-by: Robin Jadoul <robin.jadoul@gmail.com> * spec/MEMW: fix interaction typing * spec/MEMW: drop superfluous notes * spec/MEMW: update alignment requirement * spec/MEMW: intentionally separate carry's prose and .toml descriptions * spec/MEMW: fix multiplicities * spec/MEMW_A: padding * spec/MEMW: padding * spec/MEMW: bit check multiplicities * spec/MEMW: simplify padding --------- Co-authored-by: Robin Jadoul <robin.jadoul@gmail.com>
--------- Co-authored-by: Robin Jadoul <robin.jadoul@gmail.com>
* spec: recursively compute chip interaction count * spec: print interaction count per chip * spec: cleanup * spec/interaction-counter: add multi-dimensional iter support * spec/interaction-counter: count SUB interactions * spec/interaction-counter: drop silent lookup fails * spec/interaction-counter: remove superfluous code * spec/interaction_count: merge getter and setter * spec/interaction_counter: clean up
* spec: have tooling exit(1) on error * spec: run spec tooling in CI * spec/tooling: verbosely state when no issues are found * spec/CI: ignore benchmarks for spec stuff
* spec: add chapters * spec: clean up toc * spec: separate ecalls * Fixes for shiroa * Reformat ebook.typ a bit --------- Co-authored-by: Robin Jadoul <robin.jadoul@3milabs.tech>
* spec: add backticks to section titles * spec: replace "columns" headers with "variables" * spec: auto count nr_variables * spec: standardize "optimizations"-section headers * spec/config: add missing spaces * spec/chip: rename *_column_table as *_variable_table * spec: drop table captions * spec/v0.2: turn note into aside * spec: place correctness arguments in separate section
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Swap precedence of ADD and SUB and treat the first subexpression of a SUB differently
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Apr 10, 2026
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spec/tooling: add default case in `build_signature` spec/tooling: fix hidden global variable spec/tooling: fix silent side effect spec/tooling: context manage file reads spec: fix precedence Swap precedence of ADD and SUB and treat the first subexpression of a SUB differently
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