56 lines
1.4 KiB
Common Lisp
56 lines
1.4 KiB
Common Lisp
// 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;
|
|
}
|
|
}
|