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Correctly set the index value for __shf_up. #2

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Correctly set the index value for __shf_up. #2

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2 changes: 1 addition & 1 deletion include/hip/amd_detail/amd_device_functions.h
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Original file line number Diff line number Diff line change
Expand Up @@ -425,7 +425,7 @@ inline
int __shfl_up(int var, unsigned int lane_delta, int width = warpSize) {
int self = __lane_id();
int index = self - lane_delta;
index = (index < (self & ~(width-1)))?self:index;
index = (index < (self & ~(width-1)))?index:self;
return __builtin_amdgcn_ds_bpermute(index<<2, var);
}
__device__
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