vyre-conform 0.1.0

Conformance suite for vyre backends — proves byte-identical output to CPU reference
Documentation 
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#[cfg(loom)]
use loom::sync::atomic::{AtomicUsize, Ordering};
#[cfg(not(loom))]
use std::sync::atomic::{AtomicUsize, Ordering};
use crate::pipeline::backend::{ConformDispatchConfig, ExecutionModel, VyreBackend};

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

    struct MockBackend {
        name: &'static str,
        output: Vec<u8>,
    }

    impl VyreBackend for MockBackend {
        fn name(&self) -> &str {
            self.name
        }

        fn dispatch(
            &self,
            _wgsl: &str,
            _input: &[u8],
            _output_size: usize,
            _config: ConformDispatchConfig,
        ) -> Result<Vec<u8>, String> {
            Ok(self.output.clone())
        }

        fn dispatch_program(
            &self,
            _program: &[u8],
            _input: &[u8],
            _output_size: usize,
            _config: ConformDispatchConfig,
        ) -> Result<Vec<u8>, String> {
            Ok(self.output.clone())
        }
    }

    #[test]
    fn swap_backend_uses_a_before_threshold() {
        let a = MockBackend {
            name: "a",
            output: vec![0xAA],
        };
        let b = MockBackend {
            name: "b",
            output: vec![0xBB],
        };
        let swap = SwapBackend::new(&a, &b, 2);

        assert_eq!(
            swap.dispatch("", &[], 1, ConformDispatchConfig::default())
                .unwrap(),
            vec![0xAA]
        );
        assert_eq!(
            swap.dispatch("", &[], 1, ConformDispatchConfig::default())
                .unwrap(),
            vec![0xAA]
        );
    }

    #[test]
    fn swap_backend_uses_b_after_threshold() {
        let a = MockBackend {
            name: "a",
            output: vec![0xAA],
        };
        let b = MockBackend {
            name: "b",
            output: vec![0xBB],
        };
        let swap = SwapBackend::new(&a, &b, 1);

        // First dispatch uses A.
        assert_eq!(
            swap.dispatch("", &[], 1, ConformDispatchConfig::default())
                .unwrap(),
            vec![0xAA]
        );
        // Second dispatch uses B.
        assert_eq!(
            swap.dispatch("", &[], 1, ConformDispatchConfig::default())
                .unwrap(),
            vec![0xBB]
        );
    }

    #[test]
    fn with_backend_swap_detects_divergence() {
        let a = MockBackend {
            name: "a",
            output: vec![0x00; 4],
        };
        let b = MockBackend {
            name: "b",
            output: vec![0xFF; 4],
        };
        let program = vyre::ir::Program::new(vec![], [1, 1, 1], vec![vyre::ir::Node::Return]);

        // swap_after = 0 means B is used immediately.
        let result = with_backend_swap(&a, &b, &program, &[], 4, ConformDispatchConfig::default(), 0);
        assert!(
            result.is_err(),
            "mixed run must be rejected when pure baselines diverge"
        );

        // swap_after = 1 means A is used for the first dispatch.
        let result = with_backend_swap(&a, &b, &program, &[], 4, ConformDispatchConfig::default(), 1);
        assert!(
            result.is_err(),
            "mixed run must be rejected when pure baselines diverge"
        );
    }

    #[test]
    fn with_backend_swap_propagates_backend_b_error() {
        struct FailingBackend;
        impl VyreBackend for FailingBackend {
            fn name(&self) -> &str {
                "failing"
            }
            fn dispatch(
                &self,
                _wgsl: &str,
                _input: &[u8],
                _output_size: usize,
                _config: ConformDispatchConfig,
            ) -> Result<Vec<u8>, String> {
                Err("backend b error".to_string())
            }
            fn dispatch_program(
                &self,
                _program: &[u8],
                _input: &[u8],
                _output_size: usize,
                _config: ConformDispatchConfig,
            ) -> Result<Vec<u8>, String> {
                Err("backend b error".to_string())
            }
        }

        let a = MockBackend {
            name: "a",
            output: vec![0x00; 4],
        };
        let program = vyre::ir::Program::new(vec![], [1, 1, 1], vec![vyre::ir::Node::Return]);

        // swap_after = 0 uses the failing backend immediately.
        let result = with_backend_swap(
            &a,
            &FailingBackend,
            &program,
            &[],
            4,
            ConformDispatchConfig::default(),
            0,
        );
        assert!(
            result.is_err(),
            "expected error from backend B, got: {:?}",
            result
        );
        let msg = result.unwrap_err();
        assert!(
            msg.contains("backend b error"),
            "error must propagate from backend B, got: {msg}"
        );
    }
}