73 lines
2.2 KiB
Common Lisp
73 lines
2.2 KiB
Common Lisp
#define TS 32
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#define WPT 8
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#define RTS (TS/WPT)
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#define MAX(x, y) (((x) > (y)) ? (x) : (y))
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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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// Thread identifiers
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const int row = get_local_id(0); // Local row ID (max: TS)
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const int col = get_local_id(1); // Local col ID (max: TS/WPT == RTS)
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const int globalRow = TS*get_group_id(0) + row; // Row ID of C (0..M)
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const int globalCol = TS*get_group_id(1) + col; // Col ID of C (0..N)
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// if (globalRow >= M || globalCol >= MAX(N,K)) return; // boundary check
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// Local memory to fit a tile of TS*TS elements of A and B
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__local float Asub[TS][TS];
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__local float Bsub[TS][TS];
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// Initialise the accumulation registers
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float acc[WPT];
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for (int w=0; w<WPT; w++) {
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acc[w] = 0.0f;
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}
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// Loop over all tiles
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const int numTiles = (K+TS-1)/TS;
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for (int t=0; t<numTiles; t++) {
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int tile_size = TS;
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if (t == numTiles - 1) {
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}
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// Load one tile of A and B into local memory
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for (int w=0; w<WPT; w++) {
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const int tiledRow = TS*t + row;
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const int tiledCol = TS*t + col;
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if ((globalRow + w*RTS) >= M || tiledCol >= K) {
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Asub[row + w*RTS][col] = 0;
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} else {
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Asub[row + w*RTS][col] = A[(globalRow + w*RTS)*K + tiledCol];
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}
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if ((tiledRow + w*RTS) >= K || globalCol >= N) {
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Bsub[row + w*RTS][col] = 0;
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} else {
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Bsub[row + w*RTS][col] = B[(tiledRow + w*RTS)*N + globalCol];
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}
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}
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// Synchronise to make sure the tile is loaded
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barrier(CLK_LOCAL_MEM_FENCE);
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// Perform the computation for a single tile
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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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acc[w] += Asub[row + w*RTS][k] * Bsub[k][col];
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}
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}
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// Synchronise before loading the next tile
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barrier(CLK_LOCAL_MEM_FENCE);
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}
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// Store the final results in C
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for (int w=0; w<WPT; w++) {
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if ((globalRow + w*RTS) >= M || globalCol >= N) {
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continue;
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}
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C[(globalRow + w*RTS)*N + globalCol] = acc[w];
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}
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}
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