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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* device data taken from CUDA occupancy calculator */
/* 3.0 and 3.5 */
#if __CUDA_ARCH__ == 300 || __CUDA_ARCH__ == 350
# define CUDA_MULTIPRESSOR_MAX_REGISTERS 65536
# define CUDA_MULTIPROCESSOR_MAX_BLOCKS 16
# define CUDA_BLOCK_MAX_THREADS 1024
# define CUDA_THREAD_MAX_REGISTERS 63
/* tunable parameters */
# define CUDA_THREADS_BLOCK_WIDTH 16
# define CUDA_KERNEL_MAX_REGISTERS 63
# define CUDA_KERNEL_BRANCHED_MAX_REGISTERS 63
/* 3.2 */
#elif __CUDA_ARCH__ == 320
# define CUDA_MULTIPRESSOR_MAX_REGISTERS 32768
# define CUDA_MULTIPROCESSOR_MAX_BLOCKS 16
# define CUDA_BLOCK_MAX_THREADS 1024
# define CUDA_THREAD_MAX_REGISTERS 63
/* tunable parameters */
# define CUDA_THREADS_BLOCK_WIDTH 16
# define CUDA_KERNEL_MAX_REGISTERS 63
# define CUDA_KERNEL_BRANCHED_MAX_REGISTERS 63
/* 3.7 */
#elif __CUDA_ARCH__ == 370
# define CUDA_MULTIPRESSOR_MAX_REGISTERS 65536
# define CUDA_MULTIPROCESSOR_MAX_BLOCKS 16
# define CUDA_BLOCK_MAX_THREADS 1024
# define CUDA_THREAD_MAX_REGISTERS 255
/* tunable parameters */
# define CUDA_THREADS_BLOCK_WIDTH 16
# define CUDA_KERNEL_MAX_REGISTERS 63
# define CUDA_KERNEL_BRANCHED_MAX_REGISTERS 63
/* 5.x, 6.x */
#elif __CUDA_ARCH__ <= 699
# define CUDA_MULTIPRESSOR_MAX_REGISTERS 65536
# define CUDA_MULTIPROCESSOR_MAX_BLOCKS 32
# define CUDA_BLOCK_MAX_THREADS 1024
# define CUDA_THREAD_MAX_REGISTERS 255
/* tunable parameters */
# define CUDA_THREADS_BLOCK_WIDTH 16
/* CUDA 9.0 seems to cause slowdowns on high-end Pascal cards unless we increase the number of
* registers */
# if __CUDACC_VER_MAJOR__ >= 9 && __CUDA_ARCH__ >= 600
# define CUDA_KERNEL_MAX_REGISTERS 64
# else
# define CUDA_KERNEL_MAX_REGISTERS 48
# endif
# define CUDA_KERNEL_BRANCHED_MAX_REGISTERS 63
/* 7.x, 8.x */
#elif __CUDA_ARCH__ <= 899
# define CUDA_MULTIPRESSOR_MAX_REGISTERS 65536
# define CUDA_MULTIPROCESSOR_MAX_BLOCKS 32
# define CUDA_BLOCK_MAX_THREADS 1024
# define CUDA_THREAD_MAX_REGISTERS 255
/* tunable parameters */
# define CUDA_THREADS_BLOCK_WIDTH 16
# define CUDA_KERNEL_MAX_REGISTERS 64
# define CUDA_KERNEL_BRANCHED_MAX_REGISTERS 72
/* unknown architecture */
#else
# error "Unknown or unsupported CUDA architecture, can't determine launch bounds"
#endif
/* For split kernel using all registers seems fastest for now, but this
* is unlikely to be optimal once we resolve other bottlenecks. */
#define CUDA_KERNEL_SPLIT_MAX_REGISTERS CUDA_THREAD_MAX_REGISTERS
/* Compute number of threads per block and minimum blocks per multiprocessor
* given the maximum number of registers per thread. */
#define CUDA_LAUNCH_BOUNDS(threads_block_width, thread_num_registers) \
__launch_bounds__(threads_block_width *threads_block_width, \
CUDA_MULTIPRESSOR_MAX_REGISTERS / \
(threads_block_width * threads_block_width * thread_num_registers))
/* sanity checks */
#if CUDA_THREADS_BLOCK_WIDTH * CUDA_THREADS_BLOCK_WIDTH > CUDA_BLOCK_MAX_THREADS
# error "Maximum number of threads per block exceeded"
#endif
#if CUDA_MULTIPRESSOR_MAX_REGISTERS / \
(CUDA_THREADS_BLOCK_WIDTH * CUDA_THREADS_BLOCK_WIDTH * CUDA_KERNEL_MAX_REGISTERS) > \
CUDA_MULTIPROCESSOR_MAX_BLOCKS
# error "Maximum number of blocks per multiprocessor exceeded"
#endif
#if CUDA_KERNEL_MAX_REGISTERS > CUDA_THREAD_MAX_REGISTERS
# error "Maximum number of registers per thread exceeded"
#endif
#if CUDA_KERNEL_BRANCHED_MAX_REGISTERS > CUDA_THREAD_MAX_REGISTERS
# error "Maximum number of registers per thread exceeded"
#endif
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