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processParentBatchSIMD

blake3.processParentBatchSIMD

fn processParentBatchSIMD(ctx: ParentBatchContext) void

File

lib/std/crypto/blake3.zig:728

Code

fn processParentBatchSIMD(ctx: ParentBatchContext) void {
    const num_parents = ctx.end_idx - ctx.start_idx;
    if (num_parents == 0) return;

    // Convert input CVs to bytes for SIMD processing
    var input_bytes: [max_simd_degree * 2 * Blake3.digest_length]u8 = undefined;
    var output_bytes: [max_simd_degree * Blake3.digest_length]u8 = undefined;
    var parents_array: [max_simd_degree][*]const u8 = undefined;

    var processed: usize = 0;
    while (processed < num_parents) {
        const batch_size: usize = @min(num_parents - processed, max_simd_degree);

        // Convert CV pairs to byte blocks for this batch
        for (0..batch_size) |i| {
            const pair_idx = ctx.start_idx + processed + i;
            const left_cv = ctx.input_cvs[pair_idx * 2];
            const right_cv = ctx.input_cvs[pair_idx * 2 + 1];

            // Write left CV || right CV to form 64-byte parent block
            for (0..8) |j| {
                store32(input_bytes[i * 64 + j * 4 ..][0..4], left_cv[j]);
                store32(input_bytes[i * 64 + 32 + j * 4 ..][0..4], right_cv[j]);
            }
            parents_array[i] = input_bytes[i * 64 ..].ptr;
        }

        hashMany(parents_array[0..batch_size], batch_size, 1, ctx.key, 0, false, ctx.flags.with(.{ .parent = true }), .{}, .{}, output_bytes[0 .. batch_size * Blake3.digest_length]);

        for (0..batch_size) |i| {
            const output_idx = ctx.start_idx + processed + i;
            ctx.output_cvs[output_idx] = loadCvWords(output_bytes[i * Blake3.digest_length ..][0..Blake3.digest_length].*);
        }

        processed += batch_size;
    }
}