vyre-lower 0.6.4

Substrate-neutral lowering: vyre Program → KernelDescriptor consumed by vyre-emit-* crates.
Documentation 
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//! Output type for the texture-memory promotion analysis.

use crate::analyses::candidate_plan::CandidatePlan;
use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct TextureCandidate {
    pub binding_slot: u32,
    /// Number of distinct LoadGlobal sites against this binding.
    pub load_count: u32,
    /// Estimated speedup multiplier from texture promotion. Conservative
    /// `1.5 + log2(load_count)` to avoid overpromise.
    pub estimated_speedup_factor: f32,
}

pub type TexturePromotionPlan = CandidatePlan<TextureCandidate>;

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

    #[test]
    fn candidate_speedup_grows_with_log_load_count() {
        let cand = TextureCandidate {
            binding_slot: 0,
            load_count: 8,
            estimated_speedup_factor: 1.5 + 3.0, // log2(8) = 3
        };
        assert!((cand.estimated_speedup_factor - 4.5).abs() < 1e-5);
    }
}