0dd6ed74fd
This patch implements the device runtime library whose interface is used in the code generation for OpenMP offloading devices. Currently there is a single device RTL written in CUDA meant to CUDA enabled GPUs. The interface is a variation of the kmpc interface that includes some extra calls to do thread and storage management that only make sense for a GPU target. Differential revision: https://reviews.llvm.org/D14254 llvm-svn: 323649
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
//===--------- statequeue.h - NVPTX OpenMP GPU State Queue ------- CUDA -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.txt for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a queue to hand out OpenMP state objects to teams of
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// one or more kernels.
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//
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// Reference:
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// Thomas R.W. Scogland and Wu-chun Feng. 2015.
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// Design and Evaluation of Scalable Concurrent Queues for Many-Core
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// Architectures. International Conference on Performance Engineering.
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//
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//===----------------------------------------------------------------------===//
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#ifndef __STATE_QUEUE_H
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#define __STATE_QUEUE_H
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#include <stdint.h>
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#include "option.h" // choices we have
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template <typename ElementType, uint32_t SIZE> class omptarget_nvptx_Queue {
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private:
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ElementType elements[SIZE];
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volatile ElementType *elementQueue[SIZE];
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volatile uint32_t head;
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volatile uint32_t ids[SIZE];
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volatile uint32_t tail;
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static const uint32_t MAX_ID = (1u << 31) / SIZE / 2;
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INLINE uint32_t ENQUEUE_TICKET();
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INLINE uint32_t DEQUEUE_TICKET();
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INLINE uint32_t ID(uint32_t ticket);
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INLINE bool IsServing(uint32_t slot, uint32_t id);
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INLINE void PushElement(uint32_t slot, ElementType *element);
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INLINE ElementType *PopElement(uint32_t slot);
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INLINE void DoneServing(uint32_t slot, uint32_t id);
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public:
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INLINE omptarget_nvptx_Queue(){};
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INLINE void Enqueue(ElementType *element);
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INLINE ElementType *Dequeue();
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};
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#include "state-queuei.h"
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#endif
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