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/*
* Copyright 2014 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.
*/
#ifndef __UTIL_ATOMIC_H__
#define __UTIL_ATOMIC_H__
#ifndef __KERNEL_GPU__
/* Using atomic ops header from Blender. */
# include "atomic_ops.h"
# define atomic_add_and_fetch_float(p, x) atomic_add_and_fetch_fl((p), (x))
# define atomic_compare_and_swap_float(p, old_val, new_val) \
atomic_cas_float((p), (old_val), (new_val))
# define atomic_fetch_and_inc_uint32(p) atomic_fetch_and_add_uint32((p), 1)
# define atomic_fetch_and_dec_uint32(p) atomic_fetch_and_add_uint32((p), -1)
# define CCL_LOCAL_MEM_FENCE 0
# define ccl_barrier(flags) ((void)0)
#else /* __KERNEL_GPU__ */
# ifdef __KERNEL_OPENCL__
/* Float atomics implementation credits:
* http://suhorukov.blogspot.in/2011/12/opencl-11-atomic-operations-on-floating.html
*/
ccl_device_inline float atomic_add_and_fetch_float(volatile ccl_global float *source,
const float operand)
{
union {
unsigned int int_value;
float float_value;
} new_value;
union {
unsigned int int_value;
float float_value;
} prev_value;
do {
prev_value.float_value = *source;
new_value.float_value = prev_value.float_value + operand;
} while (atomic_cmpxchg((volatile ccl_global unsigned int *)source,
prev_value.int_value,
new_value.int_value) != prev_value.int_value);
return new_value.float_value;
}
ccl_device_inline float atomic_compare_and_swap_float(volatile ccl_global float *dest,
const float old_val,
const float new_val)
{
union {
unsigned int int_value;
float float_value;
} new_value, prev_value, result;
prev_value.float_value = old_val;
new_value.float_value = new_val;
result.int_value = atomic_cmpxchg(
(volatile ccl_global unsigned int *)dest, prev_value.int_value, new_value.int_value);
return result.float_value;
}
# define atomic_fetch_and_add_uint32(p, x) atomic_add((p), (x))
# define atomic_fetch_and_inc_uint32(p) atomic_inc((p))
# define atomic_fetch_and_dec_uint32(p) atomic_dec((p))
# define atomic_fetch_and_or_uint32(p, x) atomic_or((p), (x))
# define CCL_LOCAL_MEM_FENCE CLK_LOCAL_MEM_FENCE
# define ccl_barrier(flags) barrier(flags)
# endif /* __KERNEL_OPENCL__ */
# ifdef __KERNEL_CUDA__
# define atomic_add_and_fetch_float(p, x) (atomicAdd((float *)(p), (float)(x)) + (float)(x))
# define atomic_fetch_and_add_uint32(p, x) atomicAdd((unsigned int *)(p), (unsigned int)(x))
# define atomic_fetch_and_sub_uint32(p, x) atomicSub((unsigned int *)(p), (unsigned int)(x))
# define atomic_fetch_and_inc_uint32(p) atomic_fetch_and_add_uint32((p), 1)
# define atomic_fetch_and_dec_uint32(p) atomic_fetch_and_sub_uint32((p), 1)
# define atomic_fetch_and_or_uint32(p, x) atomicOr((unsigned int *)(p), (unsigned int)(x))
ccl_device_inline float atomic_compare_and_swap_float(volatile float *dest,
const float old_val,
const float new_val)
{
union {
unsigned int int_value;
float float_value;
} new_value, prev_value, result;
prev_value.float_value = old_val;
new_value.float_value = new_val;
result.int_value = atomicCAS((unsigned int *)dest, prev_value.int_value, new_value.int_value);
return result.float_value;
}
# define CCL_LOCAL_MEM_FENCE
# define ccl_barrier(flags) __syncthreads()
# endif /* __KERNEL_CUDA__ */
#endif /* __KERNEL_GPU__ */
#endif /* __UTIL_ATOMIC_H__ */
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