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Round the epilogue offset to positive values in cunn_SoftMaxForward #2210

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Round the epilogue offset to positive values in cunn_SoftMaxForward #2210

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13 changes: 13 additions & 0 deletions aten/src/ATen/native/cuda/SoftMax.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
#include <ATen/TensorUtils.h>
#include <ATen/TensorOperators.h>
#include <ATen/WrapDimUtils.h>
#include <ATen/ceil_div.h>
#include <c10/macros/Macros.h>

#include <ATen/AccumulateType.h>
Expand Down Expand Up @@ -486,6 +487,10 @@ ilpReduce(index_t shift,
}

offset = size - last + threadIdx.x;
if (offset < 0) {
// Ensure offset >= 0
offset += round_up<long>(-offset, blockDim.x);
}
// Epilogue
for (; offset < size; offset += blockDim.x)
threadVal = r(threadVal, data[offset]);
Expand Down Expand Up @@ -543,6 +548,10 @@ WriteFpropResultsVectorized(
}

offset = size - last + threadIdx.x;
if (offset < 0) {
// Ensure offset >= 0
offset += round_up<long>(-offset, blockDim.x);
}
// handle the tail
for (; offset < size; offset += blockDim.x) {
output[offset] = epilogue(input[offset]);
Expand Down Expand Up @@ -603,6 +612,10 @@ WriteBpropResultsVectorized(
}

offset = size - last + threadIdx.x;
if (offset < 0) {
// Ensure offset >= 0
offset += round_up<long>(-offset, blockDim.x);
}
for (; offset < size; offset += blockDim.x) {
gradInput[offset] = epilogue(gradOutput[offset], output[offset]);
}
Expand Down