36 lines
1.1 KiB
Plaintext
36 lines
1.1 KiB
Plaintext
#version 450
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#include "dequant_head.comp"
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layout(local_size_x = 256, local_size_y = 1, local_size_z = 1) in;
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layout (binding = 0) readonly buffer A {block_iq1_s data_a[];};
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layout (binding = 1) writeonly buffer D {D_TYPE data_b[];};
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void main() {
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// Each thread handles 1 subblock (32 values with 2 scales)
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const uint ib = gl_WorkGroupID.x * 32 + gl_LocalInvocationID.x / 8;
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init_iq_shmem(gl_WorkGroupSize);
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if (ib >= p.nel / 256) {
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return;
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}
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const uint ib32 = gl_LocalInvocationID.x % 8;
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const uint b_idx = 256 * ib + 32 * ib32;
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uint qh = data_a[ib].qh[ib32];
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const float d = float(data_a[ib].d);
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const float dl = d * float(2 * bitfieldExtract(qh, 12, 3) + 1);
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const float delta = ((qh & 0x8000) != 0) ? -IQ1S_DELTA : IQ1S_DELTA;
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[[unroll]] for (uint l = 0; l < 4; ++l) {
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const uint qs = data_a[ib].qs[4 * ib32 + l];
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const uint hi = bitfieldExtract(qh, 3 * int(l), 3);
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const int16_t grid = int16_t(iq1s_grid[qs | (hi << 8)]);
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[[unroll]] for (int j = 0; j < 8; ++j) {
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data_b[b_idx + 8 * l + j] = D_TYPE(dl * (bitfieldExtract(grid, 2*j, 2) + delta));
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}
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}
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}
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