chundoong-lab-ta/SamsungDS22/submissions/HW5/jihye65.park/kernel.cl

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Common Lisp
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2022-09-29 18:01:45 +09:00
// super super slow sgemm kernel by heehoon
#define TS 32
#define WPT 8
#define RTS (TS/WPT)
__kernel void sgemm(__global float *A, __global float *B, __global float *C, int M, int N, int K) {
const int row = get_local_id(0); // row index of C
const int col = get_local_id(1); // column index of C
const int global_row = TS*get_group_id(0)+row;
const int global_col = TS*get_group_id(1)+col;
__local float Asub[TS][TS];
__local float Bsub[TS][TS];
float sum[WPT];
for(int w=0; w<WPT; w++){
sum[w] = 0.0f;
}
int num_tiles = (K+TS-1)/TS;
// const int num_tiles = K/TS;
for(int t=0; t<num_tiles; t++){
for(int w=0; w<WPT; w++){
const int t_row = TS*t + row;
const int t_col = TS*t + col;
// Zero padding of A
if(global_row + w*RTS < M && t_col < K)
Asub[row + w*RTS][col] = A[(global_row + w*RTS)*K + t_col];
else
Asub[row + w*RTS][col] = 0.0f;
// Zero padding of B
if(t_row + w*RTS < K && global_col < N)
Bsub[row+w*RTS][col] = B[(t_row + w*RTS)*N + global_col];
else
Bsub[row+w*RTS][col] = 0.0f;
}
barrier(CLK_LOCAL_MEM_FENCE);
for (int k = 0; k < TS; k++) {
for(int w=0; w<WPT; w++){
sum[w] += Asub[row + w*RTS][k] * Bsub[k][col];
}
}
barrier(CLK_LOCAL_MEM_FENCE);
}
for(int w=0; w<WPT; w++){
if(global_row + w*RTS < M && global_col < N)
C[(global_row+w*RTS)*N + global_col] = sum[w];
else continue;
}
}