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/*
* N-dimensional strided array
* Copyright 2018-2020 Anton Khirnov <anton@khirnov.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "ndarray.h"
struct NDArrayInternal {
size_t alloc_size;
void *data;
size_t *shape;
ptrdiff_t *stride;
};
int ndarray_alloc(NDArray **result, unsigned int dims,
const size_t * const size, unsigned int flags)
{
NDArray *a;
int ret;
if (!dims || dims >= INT_MAX)
return -EINVAL;
a = calloc(1, sizeof(*a));
if (!a)
return -ENOMEM;
a->priv = calloc(1, sizeof(*a->priv));
if (!a->priv) {
free(a);
return -ENOMEM;
}
a->priv->shape = calloc(dims, sizeof(*a->priv->shape));
if (!a->priv->shape) {
ret = -ENOMEM;
goto fail;
}
memcpy(a->priv->shape, size, dims * sizeof(*a->priv->shape));
a->priv->stride = calloc(dims, sizeof(*a->priv->stride));
if (!a->priv->stride) {
ret = -ENOMEM;
goto fail;
}
a->priv->stride[dims - 1] = 1;
for (int i = (int)dims - 2; i >= 0; i--)
a->priv->stride[i] = size[i + 1] * a->priv->stride[i + 1];
a->priv->alloc_size = a->priv->stride[0] * size[0] * sizeof(*a->data);
ret = posix_memalign((void**)&a->priv->data, 64, a->priv->alloc_size);
if (ret != 0) {
ret = -ret;
goto fail;
}
if (flags & NDARRAY_ALLOC_ZERO)
memset(a->priv->data, 0, a->priv->alloc_size);
a->dims = dims;
a->data = a->priv->data;
a->shape = a->priv->shape;
a->stride = a->priv->stride;
*result = a;
return 0;
fail:
ndarray_free(&a);
return ret;
}
int ndarray_slice(NDArray **result, NDArray *src,
const NDASlice * const slice)
{
NDArray *a;
ptrdiff_t offset;
int ret;
a = calloc(1, sizeof(*a));
if (!a)
return -ENOMEM;
a->priv = calloc(1, sizeof(*a->priv));
if (!a->priv) {
free(a);
return -ENOMEM;
}
a->priv->shape = calloc(src->dims, sizeof(*a->priv->shape));
if (!a->priv->shape) {
ret = -ENOMEM;
goto fail;
}
memcpy(a->priv->shape, src->priv->shape, src->dims * sizeof(*a->priv->shape));
a->priv->stride = calloc(src->dims, sizeof(*a->priv->stride));
if (!a->priv->stride) {
ret = -ENOMEM;
goto fail;
}
memcpy(a->priv->stride, src->priv->stride, src->dims * sizeof(*a->priv->shape));
offset = 0;
for (unsigned int i = 0; i < src->dims; i++) {
const NDASlice *s = &slice[i];
ptrdiff_t start, end, step;
if (s->start == PTRDIFF_MAX) {
start = 0;
end = src->shape[i];
step = 1;
} else {
start = s->start;
end = s->end;
step = s->step;
if (step < 1) {
ret = step ? -ENOSYS : -EINVAL;
goto fail;
}
if (start < 0)
start = src->shape[i] + start;
if (end <= 0)
end = src->shape[i] + end;
if (start >= end || end > src->shape[i]) {
ret = -EINVAL;
goto fail;
}
}
offset += src->stride[i] * start;
a->priv->stride[i] *= step;
a->priv->shape[i] = (end - start) / step;
}
a->dims = src->dims;
a->data = src->data + offset;
a->shape = a->priv->shape;
a->stride = a->priv->stride;
*result = a;
return 0;
fail:
ndarray_free(&a);
return ret;
}
int ndarray_wrap(NDArray **result, unsigned int dims,
const size_t * const size, double *data,
const ptrdiff_t * const stride)
{
NDArray *a;
int ret;
if (!dims || dims >= INT_MAX)
return -EINVAL;
a = calloc(1, sizeof(*a));
if (!a)
return -ENOMEM;
a->priv = calloc(1, sizeof(*a->priv));
if (!a->priv) {
free(a);
return -ENOMEM;
}
a->priv->shape = calloc(dims, sizeof(*a->priv->shape));
if (!a->priv->shape) {
ret = -ENOMEM;
goto fail;
}
memcpy(a->priv->shape, size, dims * sizeof(*a->priv->shape));
a->priv->stride = calloc(dims, sizeof(*a->priv->stride));
if (!a->priv->stride) {
ret = -ENOMEM;
goto fail;
}
memcpy(a->priv->stride, stride, dims * sizeof(*a->priv->shape));
a->dims = dims;
a->data = data;
a->shape = a->priv->shape;
a->stride = a->priv->stride;
*result = a;
return 0;
fail:
ndarray_free(&a);
return ret;
}
void ndarray_free(NDArray **pa)
{
NDArray *a = *pa;
if (!a)
return;
if (a->priv) {
free(a->priv->data);
free(a->priv->shape);
free(a->priv->stride);
}
free(a->priv);
free(a);
*pa = NULL;
}
static int copy_axis(NDArray *dst, const NDArray *src, unsigned int axis,
ptrdiff_t offset_dst, ptrdiff_t offset_src)
{
if (dst->shape[axis] != src->shape[axis])
return -EINVAL;
if (axis == dst->dims - 1) {
if (dst->stride[axis] == 1 && src->stride[axis] == 1)
memcpy(dst->data + offset_dst, src->data + offset_src, sizeof(*dst->data) * dst->shape[axis]);
else {
for (size_t idx = 0; idx < dst->shape[axis]; idx++)
dst->data[offset_dst + idx * dst->stride[axis]] = src->data[offset_src + idx * src->stride[axis]];
}
return 0;
}
for (size_t idx = 0; idx < dst->shape[axis]; idx++)
copy_axis(dst, src, axis + 1, offset_dst + idx * dst->stride[axis], offset_src + idx * src->stride[axis]);
return 0;
}
int ndarray_copy(NDArray *dst, const NDArray *src)
{
const unsigned int dims = src->dims;
if (dims != dst->dims)
return -EINVAL;
return copy_axis(dst, src, 0, 0, 0);
}
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