#ifdef VEC
#define VEC_SIZE 4
#define SHMEM_TYPE vec4<f16>
#define DST_TYPE vec4<f32>
#define SRC0_TYPE vec4<SRC0_INNER_TYPE>
#define SRC1_TYPE vec4<SRC1_INNER_TYPE>
fn store_shmem(val: vec4<f16>, idx: u32) {
shmem[idx] = val.x;
shmem[idx + 1] = val.y;
shmem[idx + 2] = val.z;
shmem[idx + 3] = val.w;
}
#endif // VEC
#ifdef SCALAR
#define VEC_SIZE 1
#define SHMEM_TYPE f16
#define DST_TYPE f32
#define SRC0_TYPE SRC0_INNER_TYPE
#define SRC1_TYPE SRC1_INNER_TYPE
fn store_shmem(val: f16, idx: u32) {
shmem[idx] = val;
}
#endif // SCALAR
#ifdef INIT_SRC0_SHMEM_FLOAT
fn init_shmem_src0(thread_id: u32, batch_offset: u32, offset_m: u32, k_outer: u32) {
for (var elem_idx = thread_id * VEC_SIZE; elem_idx < TILE_SRC0_SHMEM; elem_idx += TOTAL_WORKGROUP_SIZE * VEC_SIZE) {
let tile_m = elem_idx / TILE_K;
let tile_k = elem_idx % TILE_K;
let global_m = offset_m + tile_m;
let global_k = k_outer + tile_k;
let src0_idx = batch_offset + global_m * params.stride_01 + global_k;
let src0_val = select( // taking a slight performance hit to avoid oob
SRC0_TYPE(0.0),
src0[src0_idx/VEC_SIZE],
global_m < params.m && global_k < params.k);
store_shmem(SHMEM_TYPE(src0_val), elem_idx);
}
}
#endif // INIT_SRC0_SHMEM_FLOAT
#ifndef MUL_MAT_ID
#ifdef INIT_SRC1_SHMEM_FLOAT
fn init_shmem_src1(thread_id: u32, batch_offset: u32, offset_n: u32, k_outer: u32) {
for (var elem_idx = thread_id * VEC_SIZE; elem_idx < TILE_SRC1_SHMEM; elem_idx += TOTAL_WORKGROUP_SIZE * VEC_SIZE) {
let tile_n = elem_idx / TILE_K;
let tile_k = elem_idx % TILE_K;
let global_n = offset_n + tile_n;
let global_k = k_outer + tile_k;
let src1_idx = batch_offset + global_n * params.stride_11 + global_k;
let src1_val = select(
SRC1_TYPE(0.0),
src1[src1_idx/VEC_SIZE],
global_n < params.n && global_k < params.k);
store_shmem(SHMEM_TYPE(src1_val), TILE_SRC0_SHMEM + elem_idx);
}
}
#endif // INIT_SRC1_SHMEM_FLOAT
#endif
#ifdef INIT_SRC0_SHMEM_Q4_0
const BLOCK_SIZE = 32u;
const BLOCK_SIZE_BYTES = 18u;
// the number of blocks per k-tile. Note that this currently only works if TILE_K is a multiple of BLOCK_SIZE, which may need to be rethought for larger quantized types.
override BLOCKS_K = TILE_K/BLOCK_SIZE;
const NQ = 16u;
const WEIGHTS_PER_F16 = 4u; // 4 weights per f16
const F16_PER_THREAD = NQ / WEIGHTS_PER_F16;
fn init_shmem_src0(thread_id: u32, batch_offset: u32, offset_m: u32, k_outer: u32) {
for (var i = thread_id * NQ; i < TILE_SRC0_SHMEM; i += TOTAL_WORKGROUP_SIZE * NQ) {
let blck_idx = i / BLOCK_SIZE;
let block_offset = (i % BLOCK_SIZE) / WEIGHTS_PER_F16;
let shmem_idx = blck_idx * BLOCK_SIZE + block_offset * 2u;
let tile_m = blck_idx / BLOCKS_K;
let global_m = offset_m + tile_m;
let block_k = blck_idx % BLOCKS_K;
let global_k = k_outer / BLOCK_SIZE + block_k;
if (global_m < params.m && global_k < params.k / BLOCK_SIZE) {
let src0_idx = batch_offset + global_m * params.stride_01 + global_k;
let block_byte_base = src0_idx * BLOCK_SIZE_BYTES;
let d = load_f16_at_src0(block_byte_base);
for (var j = 0u; j < F16_PER_THREAD; j += 2) {
let q_byte_offset = block_byte_base + 2u + 2u * (block_offset + j);
let q_packed = load_u32_at_src0(q_byte_offset);
for (var k = 0u; k < 4u; k++) {
let q_byte = get_byte(q_packed, k);
let q_hi = (f16((q_byte >> 4) & 0xF) - 8.0) * d;
let q_lo = (f16(q_byte & 0xF) - 8.0) * d;
shmem[shmem_idx + j * 2 + k] = q_lo;
shmem[shmem_idx + j * 2 + k + 16u] = q_hi;
}
}
}
}
}
#endif // INIT_SRC0_SHMEM_Q4_0
#ifdef INIT_SRC0_SHMEM_Q4_1
const BLOCK_SIZE = 32u;
const BLOCK_SIZE_BYTES = 20u;
// the number of blocks per k-tile. Note that this currently only works if TILE_K is a multiple of BLOCK_SIZE, which may need to be rethought for larger quantized types.
override BLOCKS_K = TILE_K/BLOCK_SIZE;
const NQ = 16u;
const WEIGHTS_PER_F16 = 4u; // 4 weights per f16
const F16_PER_THREAD = NQ / WEIGHTS_PER_F16;
fn init_shmem_src0(thread_id: u32, batch_offset: u32, offset_m: u32, k_outer: u32) {
for (var i = thread_id * NQ; i < TILE_SRC0_SHMEM; i += TOTAL_WORKGROUP_SIZE * NQ) {
let blck_idx = i / BLOCK_SIZE;
let block_offset = (i % BLOCK_SIZE) / WEIGHTS_PER_F16;
let shmem_idx = blck_idx * BLOCK_SIZE + block_offset * 2u;
let tile_m = blck_idx / BLOCKS_K;
let global_m = offset_m + tile_m;
let block_k = blck_idx % BLOCKS_K;
let global_k = k_outer / BLOCK_SIZE + block_k;
if (global_m < params.m && global_k < params.k / BLOCK_SIZE) {
let src0_idx = batch_offset + global_m * params.stride_01 + global_k;
let block_byte_base = src0_idx * BLOCK_SIZE_BYTES;
let d = load_f16_at_src0(block_byte_base);
let m = load_f16_at_src0(block_byte_base + 2u);
for (var j = 0u; j < F16_PER_THREAD; j += 2) {
let q_byte_offset = block_byte_base + 4u + 2u * (block_offset + j);
let q_packed = load_u32_at_src0(q_byte_offset);
for (var k = 0u; k < 4u; k++) {
let q_byte = get_byte(q_packed, k);
let q_lo = f16(q_byte & 0xF) * d + m;
let q_hi = f16((q_byte >> 4) & 0xF) * d + m;
shmem[shmem_idx + j * 2 + k] = q_lo;
shmem[shmem_idx + j * 2 + k + 16u] = q_hi;
}
}
}
}
}
#endif // INIT_SRC0_SHMEM_Q4_1
#ifdef INIT_SRC0_SHMEM_Q5_0
// 32 weights per block, each at 4 bits each = 32 * 4 = 128 bits / 16 = 8 f16s per block
const BLOCK_SIZE = 32u;
const BLOCK_SIZE_BYTES = 22u;
// the number of blocks per k-tile. Note that this currently only works if TILE_K is a multiple of BLOCK_SIZE, which may need to be rethought for larger quantized types.
// tile_k is defined as 32u, so blocks_k ends up being 1 always
override BLOCKS_K = TILE_K / BLOCK_SIZE;
const NQ = 16u;
const WEIGHTS_PER_F16 = 4u; // 4 weights per f16
const F16_PER_THREAD = NQ / WEIGHTS_PER_F16; // 16 / 4 = 4 f16s per thread, each thread should handle 4 f16s * 4 weights per = 16 weights
fn init_shmem_src0(thread_id: u32, batch_offset: u32, offset_m: u32, k_outer: u32) {
for (var i = thread_id * NQ; i < TILE_SRC0_SHMEM; i += TOTAL_WORKGROUP_SIZE * NQ) {
let blck_idx = i / BLOCK_SIZE;
let block_offset = (i % BLOCK_SIZE) / WEIGHTS_PER_F16;
let shmem_idx = blck_idx * BLOCK_SIZE + block_offset * 2u;
let tile_m = blck_idx / BLOCKS_K;
let global_m = offset_m + tile_m;
let block_k = blck_idx % BLOCKS_K;
let global_k = k_outer / BLOCK_SIZE + block_k;
if (global_m < params.m && global_k < params.k / BLOCK_SIZE) {
let src0_idx = batch_offset + global_m * params.stride_01 + global_k;
let block_byte_base = src0_idx * BLOCK_SIZE_BYTES;
let d = load_f16_at_src0(block_byte_base);
let qh_packed = load_u32_at_src0(block_byte_base + 2u);
for (var j = 0u; j < 2; j++) {
let q_byte_offset = block_byte_base + 6u + 2u * (block_offset + j * 2u);
let q_packed = load_u32_at_src0(q_byte_offset);
let j_adjusted = j + (block_offset / 2u);
for (var k = 0u; k < 4u; k++) {
let q_byte = get_byte(q_packed, k);
let qh_hi = (qh_packed >> (j_adjusted * 4 + k + 12)) & 0x10;
let q_hi = (f16(((q_byte >> 4) & 0xF) | qh_hi) - 16.0) * d;
let qh_lo = ((qh_packed >> (j_adjusted * 4 + k)) << 4) & 0x10;
let q_lo = (f16((q_byte & 0xF) | qh_lo) - 16.0) * d;
shmem[shmem_idx + j * 4u + k] = q_lo; // store first weight
shmem[shmem_idx + j * 4u + k + 16u] = q_hi; // store second weight
}
}
}
}
}
#endif // INIT_SRC0_SHMEM_Q5_0
#ifdef INIT_SRC0_SHMEM_Q5_1
// 32 weights per block, each at 4 bits each = 32 * 4 = 128 bits / 16 = 8 f16s per block
const BLOCK_SIZE = 32u;
const BLOCK_SIZE_BYTES = 24u;
// the number of blocks per k-tile. Note that this currently only works if TILE_K is a multiple of BLOCK_SIZE, which may need to be rethought for larger quantized types.
// tile_k is defined as 32u, so blocks_k ends up being 1 always
override BLOCKS_K = TILE_K / BLOCK_SIZE;
const NQ = 16u;
const WEIGHTS_PER_F16 = 4u; // 4 weights per f16
const F16_PER_THREAD = NQ / WEIGHTS_PER_F16; // 16 / 4 = 4 f16s per thread, each thread should handle 4 f16s * 4 weights per = 16 weights
fn init_shmem_src0(thread_id: u32, batch_offset: u32, offset_m: u32, k_outer: u32) {
for (var i = thread_id * NQ; i < TILE_SRC0_SHMEM; i += TOTAL_WORKGROUP_SIZE * NQ) {
let blck_idx = i / BLOCK_SIZE;
let block_offset = (i % BLOCK_SIZE) / WEIGHTS_PER_F16;
let shmem_idx = blck_idx * BLOCK_SIZE + block_offset * 2u;
let tile_m = blck_idx / BLOCKS_K;
let global_m = offset_m + tile_m;
let block_k = blck_idx % BLOCKS_K;
let global_k = k_outer / BLOCK_SIZE + block_k;
if (global_m < params.m && global_k < params.k / BLOCK_SIZE) {
let src0_idx = batch_offset + global_m * params.stride_01 + global_k;
let block_byte_base = src0_idx * BLOCK_SIZE_BYTES;
let d = load_f16_at_src0(block_byte_base);
let m = load_f16_at_src0(block_byte_base + 2u);
let qh_packed = load_u32_at_src0(block_byte_base + 4u);
for (var j = 0u; j < 2; j++) {
let q_byte_offset = block_byte_base + 8u + 2u * (block_offset + j * 2u);
let q_packed = load_u32_at_src0(q_byte_offset);
let j_adjusted = j + (block_offset / 2u);
for (var k = 0u; k < 4u; k++) {
let q_byte = get_byte(q_packed, k);
let qh_hi = (qh_packed >> (j_adjusted * 4 + k + 12)) & 0x10;
let q_hi = (f16(((q_byte >> 4) & 0xF) | qh_hi)) * d + m;
let qh_lo = ((qh_packed >> (j_adjusted * 4 + k)) << 4) & 0x10;
let q_lo = (f16((q_byte & 0xF) | qh_lo)) * d + m;
shmem[shmem_idx + j * 4u + k] = q_lo; // store first weight
shmem[shmem_idx + j * 4u + k + 16u] = q_hi; // store second weight
}
}
}
}
}
#endif // INIT_SRC0_SHMEM_Q5_1
#ifdef INIT_SRC0_SHMEM_Q8_0
const BLOCK_SIZE = 32u;
const BLOCK_SIZE_BYTES = 34u;
// the number of blocks per k-tile. Note that this currently only works if TILE_K is a multiple of BLOCK_SIZE, which may need to be rethought for larger quantized types.
override BLOCKS_K = TILE_K/BLOCK_SIZE;
const NQ = 16u;
const WEIGHTS_PER_F16 = 2u; // 2 8-bit weights per f16
const F16_PER_THREAD = NQ / WEIGHTS_PER_F16; // 8 f16s per thread
fn init_shmem_src0(thread_id: u32, batch_offset: u32, offset_m: u32, k_outer: u32) {
for (var i = thread_id * NQ; i < TILE_SRC0_SHMEM; i += TOTAL_WORKGROUP_SIZE * NQ) {
let blck_idx = i / BLOCK_SIZE;
let block_offset = (i % BLOCK_SIZE) / WEIGHTS_PER_F16;
let shmem_idx = blck_idx * BLOCK_SIZE + block_offset * 2u;
let tile_m = blck_idx / BLOCKS_K;
let global_m = offset_m + tile_m;
let block_k = blck_idx % BLOCKS_K;
let global_k = k_outer / BLOCK_SIZE + block_k;
if (global_m < params.m && global_k < params.k / BLOCK_SIZE) {
let src0_idx = batch_offset + global_m * params.stride_01 + global_k;
let block_byte_base = src0_idx * BLOCK_SIZE_BYTES;
let d = load_f16_at_src0(block_byte_base);
for (var j = 0u; j < F16_PER_THREAD; j+=2) {
let q_byte_offset = block_byte_base + 2u + 2u * (block_offset + j);
let q_packed = load_u32_at_src0(q_byte_offset);
for (var k = 0u; k < 4u; k++) {
let q_byte = get_byte_i32(q_packed, k);
let q_val = f16(q_byte) * d;
shmem[shmem_idx + j * 2 + k] = q_val;
}
}
}
}
}
#endif // INIT_SRC0_SHMEM_Q8_0
#ifdef INIT_SRC0_SHMEM_Q8_1
const BLOCK_SIZE = 32u;
const BLOCK_SIZE_BYTES = 36u;
// the number of blocks per k-tile. Note that this currently only works if TILE_K is a multiple of BLOCK_SIZE, which may need to be rethought for larger quantized types.
override BLOCKS_K = TILE_K/BLOCK_SIZE;
const NQ = 16u;
const WEIGHTS_PER_F16 = 2u; // 2 8-bit weights per f16
const F16_PER_THREAD = NQ / WEIGHTS_PER_F16; // 8 f16s per thread, 2 threads per block
fn init_shmem_src0(thread_id: u32, batch_offset: u32, offset_m: u32, k_outer: u32) {
for (var i = thread_id * NQ; i < TILE_SRC0_SHMEM; i += TOTAL_WORKGROUP_SIZE * NQ) {
let blck_idx = i / BLOCK_SIZE;
let block_offset = (i % BLOCK_SIZE) / WEIGHTS_PER_F16;
let shmem_idx = blck_idx * BLOCK_SIZE + block_offset * 2u;
let tile_m = blck_idx / BLOCKS_K;
let global_m = offset_m + tile_m;
let block_k = blck_idx % BLOCKS_K;
let global_k = k_outer / BLOCK_SIZE + block_k;
if (global_m < params.m && global_k < params.k / BLOCK_SIZE) {
let src0_idx = batch_offset + global_m * params.stride_01 + global_k;
let block_byte_base = src0_idx * BLOCK_SIZE_BYTES;
let d = load_f16_at_src0(block_byte_base);
let m = load_f16_at_src0(block_byte_base + 2u);
for (var j = 0u; j < F16_PER_THREAD; j+=2) {
let q_byte_offset = block_byte_base + 4u + 2u * (block_offset + j);
let q_packed = load_u32_at_src0(q_byte_offset);
for (var k = 0u; k < 4u; k++) {
let q_byte = get_byte_i32(q_packed, k);
let q_val = f16(q_byte) * d + m;
shmem[shmem_idx + j * 2 + k] = q_val;
}
}
}
}
}
#endif // INIT_SRC0_SHMEM_Q8_1
#ifdef INIT_SRC0_SHMEM_Q2_K
const BLOCK_SIZE = 256u;
const BLOCK_SIZE_BYTES = 84u;
fn init_shmem_src0(thread_id: u32, batch_offset: u32, offset_m: u32, k_outer: u32) {
// Use standard thread layout instead of lane/row_group
for (var elem_idx = thread_id; elem_idx < TILE_SRC0_SHMEM; elem_idx += TOTAL_WORKGROUP_SIZE) {
let tile_m = elem_idx / TILE_K;
let tile_k = elem_idx % TILE_K;
let global_m = offset_m + tile_m;
let global_k = k_outer + tile_k;
if (global_m >= params.m || global_k >= params.k) {
shmem[elem_idx] = f16(0.0);
continue;
}
let block_k = global_k / BLOCK_SIZE;
let k_in_block = global_k % BLOCK_SIZE;
let src0_idx = batch_offset + global_m * params.stride_01 + block_k;
let block_byte_base = src0_idx * BLOCK_SIZE_BYTES;
let d = load_f16_at_src0(block_byte_base + 80u);
let dmin = load_f16_at_src0(block_byte_base + 82u);
// Decode the element at position k_in_block
let block_of_32 = k_in_block / 32u;
let pos_in_32 = k_in_block % 32u;
let q_b_idx = (block_of_32 / 4u) * 32u;
let shift = (block_of_32 % 4u) * 2u;
let k = (pos_in_32 / 16u) * 16u;
let l = pos_in_32 % 16u;
let is = k_in_block / 16u;
let sc_packed = load_u32_at_src0(block_byte_base + 4u * (is / 4u));
let sc = get_byte(sc_packed, is % 4u);
let dl = d * f16(sc & 0xFu);
let ml = dmin * f16(sc >> 4u);
let q_idx = q_b_idx + k + l;
let q_packed = load_u32_at_src0(block_byte_base + 16u + 4u * (q_idx / 4u));
let q_byte = get_byte(q_packed, q_idx % 4u);
let qs_val = (q_byte >> shift) & 3u;
let q_val = f16(qs_val) * dl - ml;
shmem[elem_idx] = q_val;
}
}
#endif // INIT_SRC0_SHMEM_Q2_K
#ifdef INIT_SRC0_SHMEM_Q3_K
const BLOCK_SIZE = 256u;
const BLOCK_SIZE_BYTES = 110u;
fn init_shmem_src0(thread_id: u32, batch_offset: u32, offset_m: u32, k_outer: u32) {
for (var elem_idx = thread_id; elem_idx < TILE_SRC0_SHMEM; elem_idx += TOTAL_WORKGROUP_SIZE) {
let tile_m = elem_idx / TILE_K;
let tile_k = elem_idx % TILE_K;
let global_m = offset_m + tile_m;
let global_k = k_outer + tile_k;
if (global_m >= params.m || global_k >= params.k) {
shmem[elem_idx] = f16(0.0);
continue;
}
let block_k = global_k / BLOCK_SIZE;
let k_in_block = global_k % BLOCK_SIZE;
let src0_idx = batch_offset + global_m * params.stride_01 + block_k;
let block_byte_base = src0_idx * BLOCK_SIZE_BYTES;
let d = load_f16_at_src0(block_byte_base + 108u);
// Load and unpack scales
let kmask1: u32 = 0x03030303u;
let kmask2: u32 = 0x0f0f0f0fu;
var scale_vals: array<u32, 4>;
for (var i: u32 = 0u; i < 4u; i++) {
scale_vals[i] = load_u32_at_src0(block_byte_base + 96u + 4u * i);
}
var tmp: u32 = scale_vals[2];
scale_vals[2] = ((scale_vals[0] >> 4u) & kmask2) | (((tmp >> 4u) & kmask1) << 4u);
scale_vals[3] = ((scale_vals[1] >> 4u) & kmask2) | (((tmp >> 6u) & kmask1) << 4u);
scale_vals[0] = (scale_vals[0] & kmask2) | ((tmp & kmask1) << 4u);
scale_vals[1] = (scale_vals[1] & kmask2) | (((tmp >> 2u) & kmask1) << 4u);
// Load hmask and qs arrays
var hmask_vals: array<u32, 8>;
for (var i: u32 = 0u; i < 8u; i++) {
hmask_vals[i] = load_u32_at_src0(block_byte_base + 4u * i);
}
var qs_vals: array<u32, 16>;
for (var i: u32 = 0u; i < 16u; i++) {
qs_vals[i] = load_u32_at_src0(block_byte_base + 32u + 4u * i);
}
let half = k_in_block / 128u; // 0 or 1
let pos_in_half = k_in_block % 128u; // 0-127
let shift_group = pos_in_half / 32u; // 0-3
let pos_in_32 = pos_in_half % 32u; // 0-31
let k_group = pos_in_32 / 16u; // 0 or 1
let l = pos_in_32 % 16u; // 0-15
let q_b_idx = half * 32u; // 0 or 32
let shift = shift_group * 2u; // 0, 2, 4, 6
let k = k_group * 16u; // 0 or 16
let is = k_in_block / 16u; // 0-15
// m increments every 32 elements across entire 256 element block
let m_shift = k_in_block / 32u; // 0-7
let m: u32 = 1u << m_shift; // 1,2,4,8,16,32,64,128
let sc = get_byte(scale_vals[is / 4u], is % 4u);
let dl = d * (f16(sc) - 32.0);
let q_idx = q_b_idx + k + l;
let hm_idx = k + l;
let q_byte = get_byte(qs_vals[q_idx / 4u], q_idx % 4u);
let hmask_byte = get_byte(hmask_vals[hm_idx / 4u], hm_idx % 4u);
let hm = select(4.0, 0.0, (hmask_byte & m) != 0);
let qs_val = (q_byte >> shift) & 3u;
let q_val = (f16(qs_val) - f16(hm)) * dl;
shmem[elem_idx] = q_val;
}
}
#endif // INIT_SRC0_SHMEM_Q3_K
#ifdef INIT_SRC0_SHMEM_Q4_K
const BLOCK_SIZE = 256u;
const BLOCK_SIZE_BYTES = 144u;
fn init_shmem_src0(thread_id: u32, batch_offset: u32, offset_m: u32, k_outer: u32) {
for (var elem_idx = thread_id; elem_idx < TILE_SRC0_SHMEM; elem_idx += TOTAL_WORKGROUP_SIZE) {
let tile_m = elem_idx / TILE_K;
let tile_k = elem_idx % TILE_K;
let global_m = offset_m + tile_m;
let global_k = k_outer + tile_k;
if (global_m >= params.m || global_k >= params.k) {
shmem[elem_idx] = f16(0.0);
continue;
}
let block_k = global_k / BLOCK_SIZE;
let k_in_block = global_k % BLOCK_SIZE;
let src0_idx = batch_offset + global_m * params.stride_01 + block_k;
let block_byte_base = src0_idx * BLOCK_SIZE_BYTES;
let d = load_f16_at_src0(block_byte_base);
let dmin = load_f16_at_src0(block_byte_base + 2u);
// Map k_in_block to loop structure:
// Outer loop over 64-element groups (alternating q_b_idx)
// Inner loop over 2 shifts per group
let group_of_64 = k_in_block / 64u; // 0-3 (maps to q_b_idx)
let pos_in_64 = k_in_block % 64u; // 0-63
let shift_group = pos_in_64 / 32u; // 0 or 1
let l = pos_in_64 % 32u; // 0-31
let q_b_idx = group_of_64 * 32u; // 0, 32, 64, 96
let shift = shift_group * 4u; // 0 or 4
let is = k_in_block / 32u; // 0-7
var sc: u32;
var mn: u32;
let scale_base = block_byte_base + 4u;
if (is < 4u) {
let sc_byte = get_byte(load_u32_at_src0(scale_base), is % 4u);
let min_byte = get_byte(load_u32_at_src0(scale_base + 4), is % 4u);
sc = sc_byte & 63u;
mn = min_byte & 63u;
} else {
let sc_min_lo = get_byte(load_u32_at_src0(scale_base + 8), (is + 4u) % 4u);
let sc_hi = get_byte(load_u32_at_src0(scale_base), (is - 4u) % 4u);
let min_hi = get_byte(load_u32_at_src0(scale_base + 4), is % 4u);
sc = (sc_min_lo & 0xFu) | ((sc_hi >> 6u) << 4u);
mn = (sc_min_lo >> 4u) | ((min_hi >> 6u) << 4u);
}
let dl = d * f16(sc);
let ml = dmin * f16(mn);
let q_idx = q_b_idx + l;
let q_packed = load_u32_at_src0(block_byte_base + 16u + 4u * (q_idx / 4u));
let q_byte = get_byte(q_packed, q_idx % 4u);
let qs_val = (q_byte >> shift) & 0xFu;
let q_val = f16(qs_val) * dl - ml;
shmem[elem_idx] = q_val;
}
}
#endif // INIT_SRC0_SHMEM_Q4_K
#ifdef INIT_SRC0_SHMEM_Q5_K
const BLOCK_SIZE = 256u;
const BLOCK_SIZE_BYTES = 176u;
fn init_shmem_src0(thread_id: u32, batch_offset: u32, offset_m: u32, k_outer: u32) {
for (var elem_idx = thread_id; elem_idx < TILE_SRC0_SHMEM; elem_idx += TOTAL_WORKGROUP_SIZE) {
let tile_m = elem_idx / TILE_K;
let tile_k = elem_idx % TILE_K;
let global_m = offset_m + tile_m;
let global_k = k_outer + tile_k;
if (global_m >= params.m || global_k >= params.k) {
shmem[elem_idx] = f16(0.0);
continue;
}
let block_k = global_k / BLOCK_SIZE;
let k_in_block = global_k % BLOCK_SIZE;
let src0_idx = batch_offset + global_m * params.stride_01 + block_k;
let block_byte_base = src0_idx * BLOCK_SIZE_BYTES;
let d = load_f16_at_src0(block_byte_base);
let dmin = load_f16_at_src0(block_byte_base + 2u);
// The original loop processes elements in groups of 64
// Each group of 64: q_b_idx cycles through [0,32,64,96], shift cycles [0,4]
// But u increments EVERY 32 elements (after each l loop)
let group_of_64 = k_in_block / 64u; // 0-3
let pos_in_64 = k_in_block % 64u; // 0-63
let shift_group = pos_in_64 / 32u; // 0 or 1
let l = pos_in_64 % 32u; // 0-31
let q_b_idx = group_of_64 * 32u; // 0, 32, 64, 96
let shift = shift_group * 4u; // 0 or 4
let is = k_in_block / 32u; // 0-7
// u increments every 32 elements (0->1, 1->2, 2->4, 3->8, 4->16, 5->32, 6->64, 7->128)
let u_shift = k_in_block / 32u; // 0-7
let u: u32 = 1u << u_shift;
var sc: u32;
var mn: u32;
let scale_base = block_byte_base + 4u;
if (is < 4u) {
let sc_byte = get_byte(load_u32_at_src0(scale_base), is % 4u);
let min_byte = get_byte(load_u32_at_src0(scale_base + 4), is % 4u);
sc = sc_byte & 63u;
mn = min_byte & 63u;
} else {
let sc_min_lo = get_byte(load_u32_at_src0(scale_base + 8), (is + 4u) % 4u);
let sc_hi = get_byte(load_u32_at_src0(scale_base), (is - 4u) % 4u);
let min_hi = get_byte(load_u32_at_src0(scale_base + 4), is % 4u);
sc = (sc_min_lo & 0xFu) | ((sc_hi >> 6u) << 4u);
mn = (sc_min_lo >> 4u) | ((min_hi >> 6u) << 4u);
}
let dl = d * f16(sc);
let ml = dmin * f16(mn);
let q_idx = q_b_idx + l;
let q_packed = load_u32_at_src0(block_byte_base + 48u + 4u * (q_idx / 4u));
let q_byte = get_byte(q_packed, q_idx % 4u);
let qh_packed = load_u32_at_src0(block_byte_base + 16u + 4u * (l / 4u));
let qh_byte = get_byte(qh_packed, l % 4u);
let qs_val = (q_byte >> shift) & 0xFu;
let qh_val = select(0.0, 16.0, (qh_byte & u) != 0);
let q_val = (f16(qs_val) + f16(qh_val)) * dl - ml;
shmem[elem_idx] = q_val;
}
}
#endif // INIT_SRC0_SHMEM_Q5_K
#ifdef INIT_SRC0_SHMEM_Q6_K
const BLOCK_SIZE = 256u;
const BLOCK_SIZE_BYTES = 210u;
fn init_shmem_src0(thread_id: u32, batch_offset: u32, offset_m: u32, k_outer: u32) {
for (var elem_idx = thread_id; elem_idx < TILE_SRC0_SHMEM; elem_idx += TOTAL_WORKGROUP_SIZE) {
let tile_m = elem_idx / TILE_K;
let tile_k = elem_idx % TILE_K;
let global_m = offset_m + tile_m;
let global_k = k_outer + tile_k;
if (global_m >= params.m || global_k >= params.k) {
shmem[elem_idx] = f16(0.0);
continue;
}
let block_k = global_k / BLOCK_SIZE;
let k_in_block = global_k % BLOCK_SIZE;
let src0_idx = batch_offset + global_m * params.stride_01 + block_k;
let block_byte_base = src0_idx * BLOCK_SIZE_BYTES;
let half = k_in_block / 128u;
let pos_in_half = k_in_block % 128u;
let quarter = pos_in_half / 32u;
let l = pos_in_half % 32u;
let ql_b_idx = half * 64u;
let qh_b_idx = half * 32u;
let sc_b_idx = half * 8u;
// Load only ql13 word needed
let ql13_flat = ql_b_idx + l;
let ql13 = load_u32_at_src0(block_byte_base + ql13_flat);
let ql13_b = get_byte(ql13, 0u);
// Load only ql24 word needed
let ql24_flat = ql_b_idx + l + 32u;
let ql24 = load_u32_at_src0(block_byte_base + ql24_flat);
let ql24_b = get_byte(ql24, 0u);
// Load only qh word needed
let qh_flat = qh_b_idx + l;
let qh = load_u32_at_src0(block_byte_base + 128u + qh_flat);
let qh_b = get_byte(qh, 0u);
let q1 = f16((ql13_b & 0xFu) | ((qh_b & 3u) << 4u)) - f16(32.0);
let q2 = f16((ql24_b & 0xFu) | (((qh_b >> 2u) & 3u) << 4u)) - f16(32.0);
let q3 = f16((ql13_b >> 4u) | (((qh_b >> 4u) & 3u) << 4u)) - f16(32.0);
let q4 = f16((ql24_b >> 4u) | (((qh_b >> 6u) & 3u) << 4u)) - f16(32.0);
// Load only the scale word needed
let is = l / 16u;
let sc_idx = sc_b_idx + is + quarter * 2u;
let sc = load_u32_at_src0(block_byte_base + 192u + sc_idx);
let sc_val = get_byte_i32(sc, 0u);
let d = load_f16_at_src0(block_byte_base + 208u);
var q_val: f16;
if (quarter == 0u) {
q_val = q1;
} else if (quarter == 1u) {
q_val = q2;
} else if (quarter == 2u) {
q_val = q3;
} else {
q_val = q4;
}
shmem[elem_idx] = d * f16(sc_val) * q_val;
}
}
#endif // INIT_SRC0_SHMEM_Q6_K