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Applying simd to AnnUpdateSgradient #18

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Applying simd to AnnUpdateSgradient #18

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21 changes: 17 additions & 4 deletions nn.c
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Original file line number Diff line number Diff line change
Expand Up @@ -737,10 +737,23 @@ void AnnUpdateSgradient(struct Ann *net) {
for (j = 1; j < layers; j++) {
int units = UNITS(net, j);
int weights = units * UNITS(net,j-1);
/* In theory this is a good target for SSE "ADDPS" instructions,
* however modern compilers figure out this automatically. */
for (i = 0; i < weights; i++)
net->layer[j].sgradient[i] += net->layer[j].gradient[i];
float *sgradient = net->layer[j].sgradient;
float *gradient = net->layer[j].gradient;
i = 0;
#ifdef USING_SIMD
int psteps = weights/SIMDF_SIZE;
for (int x = 0; x < psteps; x++) {
simdf_t sg = simdf_loadu(sgradient);
simdf_t g = simdf_loadu(gradient);
simdf_storeu(sgradient, simdf_add( sg, g));
sg += SIMDF_SIZE;
g += SIMDF_SIZE;
}
i += SIMDF_SIZE*psteps;
#endif
/* Handle final piece shorter than SIMDF_SIZE . */
for (; i < weights; i++)
(*sgradient++) += (*gradient++);
}
}

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