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GPU: skip the rows out of reach of a looper in a loop of their own #16112

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GPU: skip the rows out of reach of a looper in a loop of their own #16112

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3 changes: 3 additions & 0 deletions GPU/GPUTracking/Merger/GPUTPCGMTrackParam.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -713,6 +713,9 @@ GPUdi() void GPUTPCGMTrackParam::AttachClustersLooperFollow(const GPUTPCGMMerger
}
CADEBUG(printf("\tPropagated to y = %f: X %f Z %f SinPhi %f\n", mX, mP[0], mP[1], mP[2]));
for (uint32_t j = 0; j < GPUTPCGeometry::NROWS; j++) { // TODO: Avoid iterating over all rows
while (j < GPUTPCGeometry::NROWS - 1 && !(CAMath::Abs(GPUTPCGeometry::Row2X(j) - (-mP[0] * lrFactor)) < 1.5f)) {
j++; // Skip the rows out of reach in a loop of its own, so that the threads of a GPU warp reach the attachment together
}
float rowX = GPUTPCGeometry::Row2X(j);
if (CAMath::Abs(rowX - (-mP[0] * lrFactor)) < 1.5f) {
CADEBUG(printf("\t\tAttempt row %d (X %f Y %f Z %f)\n", j, rowX, mX * lrFactor, mP[1]));
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