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Fixed buffer overflow in ReduceOrCopy

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Bug caused AllGathers and ReduceScatters of less than
8 bytes to fail in certain cases.

Change-Id: I33e1beb50805bfdb457ae16a90e3f91c1b283b9b
Reviewed-on: http://git-master/r/1011505
Reviewed-by: Przemek Tredak <ptredak@nvidia.com>
Tested-by: Przemek Tredak <ptredak@nvidia.com>
This commit is contained in:
Nathan Luehr 2016-02-11 12:59:31 -08:00 committed by Przemek Tredak
parent caa40b8dd3
commit 9442285526
1 changed files with 2 additions and 2 deletions
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4
src/common_kernel.h
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@ -1,5 +1,5 @@
/*************************************************************************
* Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -274,7 +274,7 @@ __device__ inline void ReduceOrCopy(const int tid,
const int UNROLL2 = (UNROLL >= 2) ? (UNROLL / 2) : 1;
const bool NOUNROLL2 = ((UNROLL / 2) == 0);
int Npreamble = AlignUp(dest0, alignof(PackType)) - dest0;
int Npreamble = (N<alignof(PackType)) ? N : AlignUp(dest0, alignof(PackType)) - dest0;
// stage 0: check if we'll be able to use the fast, 64-bit aligned path.
// If not, we'll just use the slow preamble path for the whole operation