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

#version 450

#include "types.comp"
#include "generic_binary_head.comp"
#include "dequant_funcs.comp"

layout(local_size_x = 512, local_size_y = 1, local_size_z = 1) in;

void main() {
    const uint i00 = (gl_GlobalInvocationID.x)*2;
    const uint i10 = gl_GlobalInvocationID.y;
    const uint i11 = (gl_GlobalInvocationID.z)/p.ne12;
    const uint i12 = (gl_GlobalInvocationID.z)%p.ne12;

#if defined(DATA_A_IQ2_XXS) || defined(DATA_A_IQ2_XS) || defined(DATA_A_IQ2_S) || defined(DATA_A_IQ3_XXS) || defined(DATA_A_IQ3_S) || defined(DATA_A_IQ4_NL)
    init_iq_shmem(gl_WorkGroupSize);
#endif

    if (i00 >= p.ne00) {
        return;
    }

    const uint i01 = data_b[i10*p.nb10 + i11*p.nb11 + i12*p.nb12];

    const uint a_offset = i01*p.nb01 + i11*p.nb02 + i12*p.nb03;
    const uint d_offset = i10*p.nb21 + i11*p.nb22 + i12*p.nb23;

    const uint ib = a_offset + i00/QUANT_K; // block index
    const uint iqs = (i00%QUANT_K)/QUANT_R; // quant index
    const uint iybs = i00 - i00%QUANT_K; // dst block start index
    const uint y_offset = QUANT_R == 1 ? 1 : QUANT_K/2;

    vec2 v = dequantize(ib, iqs, 0);
    const vec2 dm = get_dm(ib, 0);
    v = v * dm.x + dm.y;

    data_d[d_offset + iybs + iqs           ] = D_TYPE(v.x);
    data_d[d_offset + iybs + iqs + y_offset] = D_TYPE(v.y);
}