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81 lines
3.5 KiB
Plaintext
81 lines
3.5 KiB
Plaintext
/* Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SIMPLEVOTE_KERNEL_CU
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#define SIMPLEVOTE_KERNEL_CU
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////////////////////////////////////////////////////////////////////////////////
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// Vote Any/All intrinsic kernel function tests are supported only by CUDA
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// capable devices that are CUDA hardware that has SM1.2 or later
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// Vote Functions (refer to section 4.4.5 in the CUDA Programming Guide)
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////////////////////////////////////////////////////////////////////////////////
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// Kernel #1 tests the across-the-warp vote(any) intrinsic.
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// If ANY one of the threads (within the warp) of the predicated condition
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// returns a non-zero value, then all threads within this warp will return a
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// non-zero value
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__global__ void VoteAnyKernel1(unsigned int *input, unsigned int *result,
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int size) {
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int tx = threadIdx.x;
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int mask = 0xffffffff;
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result[tx] = __any_sync(mask, input[tx]);
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}
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// Kernel #2 tests the across-the-warp vote(all) intrinsic.
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// If ALL of the threads (within the warp) of the predicated condition returns
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// a non-zero value, then all threads within this warp will return a non-zero
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// value
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__global__ void VoteAllKernel2(unsigned int *input, unsigned int *result,
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int size) {
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int tx = threadIdx.x;
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int mask = 0xffffffff;
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result[tx] = __all_sync(mask, input[tx]);
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}
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// Kernel #3 is a directed test for the across-the-warp vote(all) intrinsic.
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// This kernel will test for conditions across warps, and within half warps
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__global__ void VoteAnyKernel3(bool *info, int warp_size) {
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int tx = threadIdx.x;
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unsigned int mask = 0xffffffff;
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bool *offs = info + (tx * 3);
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// The following should hold true for the second and third warp
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*offs = __any_sync(mask, (tx >= (warp_size * 3) / 2));
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// The following should hold true for the "upper half" of the second warp,
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// and all of the third warp
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*(offs + 1) = (tx >= (warp_size * 3) / 2 ? true : false);
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// The following should hold true for the third warp only
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if (__all_sync(mask, (tx >= (warp_size * 3) / 2))) {
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*(offs + 2) = true;
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}
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}
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#endif
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