File size: 1,123 Bytes
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#version 450
#include "dequant_head.comp"
layout(local_size_x = 256, local_size_y = 1, local_size_z = 1) in;
layout (binding = 0) readonly buffer A {block_iq4_xs data_a[];};
layout (binding = 1) writeonly buffer D {D_TYPE data_b[];};
void main() {
// Each thread handles 1 subblock (1 scale and 32 quantized values)
const uint ib = gl_WorkGroupID.x * 32 + gl_LocalInvocationID.x / 8;
init_iq_shmem(gl_WorkGroupSize);
if (ib >= p.nel / 256) {
return;
}
const uint ib32 = gl_LocalInvocationID.x % 8;
const float d = float(data_a[ib].d);
// Scales are 6 bits
const uint scale = ((data_a[ib].scales_l[ib32/2] >> (4 * (ib32 & 1))) & 0xF)
| (((data_a[ib].scales_h >> (2 * ib32)) & 3) << 4);
const float dl = d * (int(scale) - 32);
const uint b_idx = 256 * ib + 32 * ib32;
const uint q_idx = 16 * ib32;
[[unroll]] for (uint l = 0; l < 16; ++l) {
data_b[b_idx + l + 0] = D_TYPE(dl * kvalues_iq4nl[data_a[ib].qs[q_idx + l] & 0xF]);
data_b[b_idx + l + 16] = D_TYPE(dl * kvalues_iq4nl[data_a[ib].qs[q_idx + l] >> 4]);
}
}
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