62 lines
1.5 KiB
Common Lisp
62 lines
1.5 KiB
Common Lisp
// super super slow sgemm kernel by heehoon
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#define TS 32
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#define WPT 8
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#define RTS TS/WPT
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__kernel void sgemm(__global float *A, __global float *B, __global float *C, int M, int N, int K) {
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const int row = get_local_id(0); // row index of C
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const int col = get_local_id(1); // column index of C
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const int global_row = TS * get_group_id(0) + row;
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const int global_col = TS * get_group_id(1) + col;
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__local float Asub[TS][TS];
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__local float Bsub[TS][TS];
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float intermediate_val[WPT];
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for(int w=0; w<WPT; w++){
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intermediate_val[w]=0.0f;
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}
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int num_tiles;
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if(K%TS == 0)
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num_tiles = K/TS;
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else
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num_tiles = K/TS + 1;
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for(int t=0; t<num_tiles; t++){
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for(int w=0; w<WPT; w++) {
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const int t_row = TS*t + row;
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const int t_col = TS*t + col;
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if((global_row + w*RTS)<M && t_col<K)
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Asub[row + w*RTS][col] = A[(global_row + w*RTS)*K+ t_col];
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else
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Asub[row + w*RTS][col] = 0.0f;
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if((t_row + w*RTS)<K && global_col<N)
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Bsub[row + w*RTS][col] = B[(t_row + w*RTS)*N + global_col];
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else
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Bsub[row + w*RTS][col] = 0.0f;
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}
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barrier(CLK_LOCAL_MEM_FENCE);
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for(int k=0; k<TS; k++){
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for(int w=0; w< WPT; w++){
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intermediate_val[w] += Asub[row + w*RTS][k] * Bsub[k][col];
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}
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}
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barrier(CLK_LOCAL_MEM_FENCE);
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}
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for(int w=0; w<WPT; w++) {
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if((global_row + w*RTS)<M && global_col<N)
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C[(global_row + w*RTS)*N + global_col] = intermediate_val[w];
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}
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}
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