llama.cpp/ggml/src/ggml-vulkan/vulkan-shaders/contig_copy.comp

#version 450

#include "types.comp"
#include "generic_unary_head.comp"

#extension GL_EXT_control_flow_attributes : require

const uint num_threads = 128;

layout(local_size_x = num_threads, local_size_y = 1, local_size_z = 1) in;

void main() {
    uint idx = get_idx();

    // num_threads * num_iter must equal 512, to match the wg_denoms and get_idx calculation
    const uint num_iter = 4;

    // fast path for when all four iterations are in-bounds
    if (idx + (num_iter-1)*num_threads < p.ne) {
        [[unroll]] for (uint i = 0; i < num_iter; ++i) {
#ifndef OPTIMIZATION_ERROR_WORKAROUND
            data_d[p.d_offset + idx] = D_TYPE(data_a[idx]);
#else
            data_d[p.d_offset + idx] = data_a[idx];
#endif
            idx += num_threads;
        }
    } else {
        [[unroll]] for (uint i = 0; i < num_iter; ++i) {
            if (idx >= p.ne) {
                continue;
            }

#ifndef OPTIMIZATION_ERROR_WORKAROUND
            data_d[p.d_offset + idx] = D_TYPE(data_a[idx]);
#else
            data_d[p.d_offset + idx] = data_a[idx];
#endif
            idx += num_threads;
        }
    }
}