weirflow 0.1.0

GPU-first dataflow analysis primitives for Vyre and Santh compiler pipelines.
Documentation 
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//! `value_set`  -  constant-value set: enumerate constants reachable
//! to a node. Used by dataflow consumers for "magic-number reaches sink"
//! patterns.

use vyre::ir::Program;
use vyre_primitives::bitset::and::bitset_and;
use vyre_primitives::graph::csr_forward_traverse::bitset_words;

pub(crate) const OP_ID: &str = "weir::value_set";

/// Build a value-set query Program.
///
/// Inputs:
/// - `const_in_buf`: per-node bitset where bit `n` is set iff some
///   constant value reaches the entry of `n`
///   (host-supplied via constant propagation).
/// - `query_set`:    per-node bitset of nodes being queried.
/// - `out`:          per-node bitset; bit `n` set iff `n` is in
///   `query_set` AND has a reaching constant.
#[must_use]
pub fn value_set(node_count: u32, const_in_buf: &str, query_set: &str, out: &str) -> Program {
    let words = bitset_words(node_count);
    vyre_harness::region::tag_program(OP_ID, bitset_and(const_in_buf, query_set, out, words))
}

/// reference oracle.
#[must_use]
#[cfg(any(test, feature = "cpu-parity"))]
#[deprecated(
    note = "reference oracle only; production code must dispatch the Weir Program on a concrete GPU backend or use weir::oracle for parity evidence"
)]
pub(crate) fn cpu_ref(const_in: &[u32], query_set: &[u32]) -> Vec<u32> {
    vyre_primitives::bitset::and::cpu_ref(const_in, query_set)
}

/// Soundness marker for [`value_set`].
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct ValueSet;
impl super::soundness::SoundnessTagged for ValueSet {
    fn soundness(&self) -> super::soundness::Soundness {
        super::soundness::Soundness::MayOver
    }
}

inventory::submit! {
    vyre_harness::OpEntry::new(
        OP_ID,
        || value_set(4, "consts", "query", "out"),
        Some(|| {
            let u32s = crate::dispatch_decode::pack_u32;
            vec![vec![u32s(&[0b1111]), u32s(&[0b0011]), u32s(&[0])]]
        }),
        Some(|| {
            let u32s = crate::dispatch_decode::pack_u32;
            vec![vec![u32s(&[0b0011])]]
        }),
    )
}

#[cfg(test)]
#[allow(deprecated)]
mod tests {
    use super::*;

    #[test]
    fn constants_reach_query() {
        assert_eq!(cpu_ref(&[0b1111], &[0b0011]), vec![0b0011]);
    }

    #[test]
    fn no_constants_yields_empty() {
        assert_eq!(cpu_ref(&[0], &[0xFFFF]), vec![0]);
    }

    #[test]
    fn empty_query_yields_empty() {
        assert_eq!(cpu_ref(&[0xFFFF], &[0]), vec![0]);
    }

    #[test]
    fn distributes_over_words() {
        let r = cpu_ref(&[0xFF00, 0x00FF], &[0x0FF0, 0x0FF0]);
        assert_eq!(r, vec![0x0F00, 0x00F0]);
    }
}