1#version 450
 2
 3#include "dequant_head.glsl"
 4
 5layout(local_size_x = 256, local_size_y = 1, local_size_z = 1) in;
 6
 7layout (binding = 0) readonly buffer A {block_mxfp4 data_a[];};
 8layout (binding = 1) writeonly buffer D {D_TYPE data_b[];};
 9
10void main() {
11    const uint i = gl_WorkGroupID.x * 4 + gl_LocalInvocationID.x / 64;
12
13    init_iq_shmem(gl_WorkGroupSize);
14
15    const uint tid = gl_LocalInvocationID.x % 64;
16    const uint il  = tid/32;
17    const uint ir  = tid%32;
18    const uint ib = 32*i + ir;
19    if (ib >= p.nel / 32) {
20        return;
21    }
22
23    const uint q_idx = 8*il;
24    const uint b_idx = 1024*i + 32*ir + q_idx;
25
26    const float d = e8m0_to_fp32(data_a[ib].e);
27
28    [[unroll]] for (uint l = 0; l < 8; ++l) {
29        data_b[b_idx + l +  0] = D_TYPE(d * 0.5 * float(kvalues_mxfp4[data_a[ib].qs[q_idx + l] & 0xF]));
30        data_b[b_idx + l + 16] = D_TYPE(d * 0.5 * float(kvalues_mxfp4[data_a[ib].qs[q_idx + l] >>  4]));
31    }
32}