chundoong-lab-ta/SamsungDS22/submissions/HW5/kaye.jeong/kernel.cl

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Common Lisp
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2022-09-29 18:01:45 +09:00
// version 3
#define TS 32
#define WPT 16
#define RTS 2
__kernel void sgemm(__global float *A, __global float *B, __global float *C, int M, int N, int K) {
// Thread identifiers
const int row = get_local_id(0); // Local row ID (max: TS)
const int col = get_local_id(1); // Local col ID (max: TS/WPT == RTS)
const int globalRow = TS*get_group_id(0) + row; // Row ID of C (0..M)
const int globalCol = TS*get_group_id(1) + col; // Col ID of C (0..N)
// Local memory to fit a tile of TS*TS elements of A and B
__local float Asub[TS][TS];
__local float Bsub[TS][TS];
// Initialise the accumulation registers
float acc[WPT];
for (int w=0; w<WPT; w++) {
acc[w] = 0.0f;
}
// Loop over all tiles
const int numTiles = (K + TS - 1)/TS;
for (int t=0; t<numTiles; t++) {
// Load one tile of A and B into local memory
const int tiledRow = TS*t + row;
const int tiledCol = TS*t + col;
if (M % TS == 0 && M == N && M == K) {
for (int w=0; w<WPT; w++) {
Asub[row + w*RTS][col] = A[(globalRow + w*RTS)*K + tiledCol];
Bsub[row + w*RTS][col] = B[(tiledRow + w*RTS)*N + globalCol];
}
} else {
for (int w=0; w<WPT; w++) {
if (globalRow + w*RTS >= M || tiledCol >= K) {
Asub[row + w*RTS][col] = 0.0f;
} else {
Asub[row + w*RTS][col] = A[(globalRow + w*RTS)*K + tiledCol];
}
if (tiledRow + w*RTS >= K || globalCol >= N) {
Bsub[row + w*RTS][col] = 0.0f;
} else {
Bsub[row + w*RTS][col] = B[(tiledRow + w*RTS)*N + globalCol];
}
}
}
// Synchronise to make sure the tile is loaded
barrier(CLK_LOCAL_MEM_FENCE);
// Perform the computation for a single tile
for (int k=0; k<TS; k++) {
for (int w=0; w<WPT; w++) {
acc[w] += Asub[row + w*RTS][k] * Bsub[k][col];
}
}
// Synchronise before loading the next tile
barrier(CLK_LOCAL_MEM_FENCE);
}
// Store the final results in C
if (M % TS == 0 && M == N && M == K) {
for (int w=0; w<WPT; w++) {
C[(globalRow + w*RTS)*N + globalCol] = acc[w];
}
} else {
for (int w=0; w<WPT; w++) {
if (globalRow + w*RTS >= M || globalCol >= N) continue;
C[(globalRow + w*RTS)*N + globalCol] = acc[w];
}
}
}