llama.cpp/vulkan-shaders/dequant_q4_0.comp

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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_q4_0 data_a[];};
layout (binding = 1) writeonly buffer D {D_TYPE data_b[];};
void main() {
const uint i = gl_WorkGroupID.x * 4 + gl_LocalInvocationID.x / 64;
const uint tid = gl_LocalInvocationID.x % 64;
const uint il = tid/32;
const uint ir = tid%32;
const uint ib = 32*i + ir;
if (ib >= p.nel / 32) {
return;
}
const uint b_idx = 1024*i + 32*ir + 8*il;
const float d = float(data_a[ib].d);
const float dm = -8.0f * d;
const uint q_idx = 8*il;
[[unroll]] for (uint l = 0; l < 8; ++l) {
data_b[b_idx + l + 0] = D_TYPE(d * (data_a[ib].qs[q_idx + l] & 0xF) + dm);
data_b[b_idx + l + 16] = D_TYPE(d * (data_a[ib].qs[q_idx + l] >> 4) + dm);
}
}