lowlevel_strided_loops.c.src

/*
 * This file contains low-level loops for copying and byte-swapping
 * strided data.
 *
 * Copyright (c) 2010 by Mark Wiebe (mwwiebe@gmail.com)
 * The Univerity of British Columbia
 *
 * See LICENSE.txt for the license.
 */

#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "structmember.h"

#define NPY_NO_DEPRECATED_API NPY_API_VERSION
#define _MULTIARRAYMODULE
#include <numpy/arrayobject.h>
#include <numpy/npy_cpu.h>
#include <numpy/halffloat.h>

#include "lowlevel_strided_loops.h"

/*
 * x86 platform may work with unaligned access, except when the
 * compiler uses aligned SSE instructions, which gcc does in some
 * cases.  This is disabled for the time being.
 */
#if (defined(NPY_CPU_X86) || defined(NPY_CPU_AMD64))
#  define NPY_USE_UNALIGNED_ACCESS 0
#else
#  define NPY_USE_UNALIGNED_ACCESS 0
#endif

#define _NPY_NOP1(x) (x)
#define _NPY_NOP2(x) (x)
#define _NPY_NOP4(x) (x)
#define _NPY_NOP8(x) (x)

#define _NPY_SWAP2(x) (((((npy_uint16)x)&0xffu) << 8) | \
                       (((npy_uint16)x) >> 8))

#define _NPY_SWAP4(x) (((((npy_uint32)x)&0xffu) << 24) | \
                       ((((npy_uint32)x)&0xff00u) << 8) | \
                       ((((npy_uint32)x)&0xff0000u) >> 8) | \
                       (((npy_uint32)x) >> 24))

#define _NPY_SWAP_PAIR4(x) (((((npy_uint32)x)&0xffu) << 8) | \
                       ((((npy_uint32)x)&0xff00u) >> 8) | \
                       ((((npy_uint32)x)&0xff0000u) << 8) | \
                       ((((npy_uint32)x)&0xff000000u) >> 8))

#define _NPY_SWAP8(x) (((((npy_uint64)x)&0xffULL) << 56) | \
                       ((((npy_uint64)x)&0xff00ULL) << 40) | \
                       ((((npy_uint64)x)&0xff0000ULL) << 24) | \
                       ((((npy_uint64)x)&0xff000000ULL) << 8) | \
                       ((((npy_uint64)x)&0xff00000000ULL) >> 8) | \
                       ((((npy_uint64)x)&0xff0000000000ULL) >> 24) | \
                       ((((npy_uint64)x)&0xff000000000000ULL) >> 40) | \
                       (((npy_uint64)x) >> 56))

#define _NPY_SWAP_PAIR8(x) (((((npy_uint64)x)&0xffULL) << 24) | \
                       ((((npy_uint64)x)&0xff00ULL) << 8) | \
                       ((((npy_uint64)x)&0xff0000ULL) >> 8) | \
                       ((((npy_uint64)x)&0xff000000ULL) >> 24) | \
                       ((((npy_uint64)x)&0xff00000000ULL) << 24) | \
                       ((((npy_uint64)x)&0xff0000000000ULL) << 8) | \
                       ((((npy_uint64)x)&0xff000000000000ULL) >> 8) | \
                       ((((npy_uint64)x)&0xff00000000000000ULL) >> 24))

#define _NPY_SWAP_INPLACE2(x) { \
        char a = (x)[0]; (x)[0] = (x)[1]; (x)[1] = a; \
        }

#define _NPY_SWAP_INPLACE4(x) { \
        char a = (x)[0]; (x)[0] = (x)[3]; (x)[3] = a; \
        a = (x)[1]; (x)[1] = (x)[2]; (x)[2] = a; \
        }

#define _NPY_SWAP_INPLACE8(x) { \
        char a = (x)[0]; (x)[0] = (x)[7]; (x)[7] = a; \
        a = (x)[1]; (x)[1] = (x)[6]; (x)[6] = a; \
        a = (x)[2]; (x)[2] = (x)[5]; (x)[5] = a; \
        a = (x)[3]; (x)[3] = (x)[4]; (x)[4] = a; \
        }

#define _NPY_SWAP_INPLACE16(x) { \
        char a = (x)[0]; (x)[0] = (x)[15]; (x)[15] = a; \
        a = (x)[1]; (x)[1] = (x)[14]; (x)[14] = a; \
        a = (x)[2]; (x)[2] = (x)[13]; (x)[13] = a; \
        a = (x)[3]; (x)[3] = (x)[12]; (x)[12] = a; \
        a = (x)[4]; (x)[4] = (x)[11]; (x)[11] = a; \
        a = (x)[5]; (x)[5] = (x)[10]; (x)[10] = a; \
        a = (x)[6]; (x)[6] = (x)[9]; (x)[9] = a; \
        a = (x)[7]; (x)[7] = (x)[8]; (x)[8] = a; \
        }

/************* STRIDED COPYING/SWAPPING SPECIALIZED FUNCTIONS *************/

/**begin repeat
 * #elsize = 1, 2, 4, 8, 16#
 * #elsize_half = 0, 1, 2, 4, 8#
 * #type = npy_uint8, npy_uint16, npy_uint32, npy_uint64, npy_uint128#
 */
/**begin repeat1
 * #oper = strided_to_strided, strided_to_contig,
 *         contig_to_strided, contig_to_contig#
 * #src_contig = 0, 0, 1 ,1#
 * #dst_contig = 0, 1, 0 ,1#
 */
/**begin repeat2
 * #swap = _NPY_NOP, _NPY_NOP, _NPY_SWAP_INPLACE, _NPY_SWAP,
 *         _NPY_SWAP_INPLACE, _NPY_SWAP_PAIR#
 * #prefix = , _aligned, _swap, _aligned_swap, _swap_pair, _aligned_swap_pair#
 * #is_aligned = 0, 1, 0, 1, 0, 1#
 * #minelsize = 1, 1, 2, 2, 4, 4#
 * #is_swap = 0, 0, 1, 1, 2, 2#
 */

#if (@elsize@ >= @minelsize@) && \
    (@elsize@ > 1 || @is_aligned@) && \
    (!NPY_USE_UNALIGNED_ACCESS || @is_aligned@)


#if @is_swap@ || @src_contig@ == 0 || @dst_contig@ == 0
static void
@prefix@_@oper@_size@elsize@(char *dst, npy_intp dst_stride,
                        char *src, npy_intp src_stride,
                        npy_intp N, npy_intp NPY_UNUSED(src_itemsize),
                        NpyAuxData *NPY_UNUSED(data))
{
    /*printf("fn @prefix@_@oper@_size@elsize@\n");*/
    while (N > 0) {
#if @is_aligned@

        /* aligned copy and swap */
#  if @elsize@ != 16
        (*((@type@ *)dst)) = @swap@@elsize@(*((@type@ *)src));
#  else
#    if @is_swap@ == 0
        (*((npy_uint64 *)dst)) = (*((npy_uint64 *)src));
        (*((npy_uint64 *)dst + 1)) = (*((npy_uint64 *)src + 1));
#    elif @is_swap@ == 1
        (*((npy_uint64 *)dst)) = _NPY_SWAP8(*((npy_uint64 *)src + 1));
        (*((npy_uint64 *)dst + 1)) = _NPY_SWAP8(*((npy_uint64 *)src));
#    elif @is_swap@ == 2
        (*((npy_uint64 *)dst)) = _NPY_SWAP8(*((npy_uint64 *)src));
        (*((npy_uint64 *)dst + 1)) = _NPY_SWAP8(*((npy_uint64 *)src + 1));
#    endif
#  endif

#else

        /* unaligned copy and swap */
        memmove(dst, src, @elsize@);
#  if @is_swap@ == 1
        @swap@@elsize@(dst);
#  elif @is_swap@ == 2
        @swap@@elsize_half@(dst);
        @swap@@elsize_half@(dst + @elsize_half@);
#  endif

#endif

#if @dst_contig@
        dst += @elsize@;
#else
        dst += dst_stride;
#endif

#if @src_contig@
        src += @elsize@;
#else
        src += src_stride;
#endif

        --N;
    }
}
#endif


/* specialized copy and swap for source stride 0 */
#if (@src_contig@ == 0) && @is_aligned@
static void
@prefix@_@oper@_size@elsize@_srcstride0(char *dst,
                        npy_intp dst_stride,
                        char *src, npy_intp NPY_UNUSED(src_stride),
                        npy_intp N, npy_intp NPY_UNUSED(src_itemsize),
                        NpyAuxData *NPY_UNUSED(data))
{
#if @elsize@ == 1 && @dst_contig@
    memset(dst, *src, N);
#else

#  if @elsize@ != 16
    @type@ temp = @swap@@elsize@(*((@type@ *)src));
#  else
    npy_uint64 temp0, temp1;
#    if @is_swap@ == 0
        temp0 = (*((npy_uint64 *)src));
        temp1 = (*((npy_uint64 *)src + 1));
#    elif @is_swap@ == 1
        temp0 = _NPY_SWAP8(*((npy_uint64 *)src + 1));
        temp1 = _NPY_SWAP8(*((npy_uint64 *)src));
#    elif @is_swap@ == 2
        temp0 = _NPY_SWAP8(*((npy_uint64 *)src));
        temp1 = _NPY_SWAP8(*((npy_uint64 *)src + 1));
#    endif
#  endif

    while (N > 0) {
#  if @elsize@ != 16
        *((@type@ *)dst) = temp;
#  else
        *((npy_uint64 *)dst) = temp0;
        *((npy_uint64 *)dst + 1) = temp1;
#  endif
#  if @dst_contig@
        dst += @elsize@;
#  else
        dst += dst_stride;
#  endif
        --N;
    }
#endif/* @elsize == 1 && @dst_contig@ -- else */
}
#endif/* (@src_contig@ == 0) && @is_aligned@ */

#endif/* @elsize@ >= @minelsize@ */

/**end repeat2**/
/**end repeat1**/
/**end repeat**/

static void
_strided_to_strided(char *dst, npy_intp dst_stride,
                        char *src, npy_intp src_stride,
                        npy_intp N, npy_intp src_itemsize,
                        NpyAuxData *NPY_UNUSED(data))
{
    while (N > 0) {
        memmove(dst, src, src_itemsize);
        dst += dst_stride;
        src += src_stride;
        --N;
    }
}

static void
_swap_strided_to_strided(char *dst, npy_intp dst_stride,
                        char *src, npy_intp src_stride,
                        npy_intp N, npy_intp src_itemsize,
                        NpyAuxData *NPY_UNUSED(data))
{
    char *a, *b, c;

    while (N > 0) {
        memmove(dst, src, src_itemsize);
        /* general in-place swap */
        a = dst;
        b = dst + src_itemsize - 1;
        while (a < b) {
            c = *a;
            *a = *b;
            *b = c;
            ++a; --b;
        }
        dst += dst_stride;
        src += src_stride;
        --N;
    }
}

static void
_swap_pair_strided_to_strided(char *dst, npy_intp dst_stride,
                        char *src, npy_intp src_stride,
                        npy_intp N, npy_intp src_itemsize,
                        NpyAuxData *NPY_UNUSED(data))
{
    char *a, *b, c;
    npy_intp itemsize_half = src_itemsize / 2;

    while (N > 0) {
        memmove(dst, src, src_itemsize);
        /* general in-place swap */
        a = dst;
        b = dst + itemsize_half - 1;
        while (a < b) {
            c = *a;
            *a = *b;
            *b = c;
            ++a; --b;
        }
        /* general in-place swap */
        a = dst + itemsize_half;
        b = dst + 2*itemsize_half - 1;
        while (a < b) {
            c = *a;
            *a = *b;
            *b = c;
            ++a; --b;
        }
        dst += dst_stride;
        src += src_stride;
        --N;
    }
}

static void
_contig_to_contig(char *dst, npy_intp NPY_UNUSED(dst_stride),
                        char *src, npy_intp NPY_UNUSED(src_stride),
                        npy_intp N, npy_intp src_itemsize,
                        NpyAuxData *NPY_UNUSED(data))
{
    memmove(dst, src, src_itemsize*N);
}


NPY_NO_EXPORT PyArray_StridedUnaryOp *
PyArray_GetStridedCopyFn(int aligned, npy_intp src_stride,
                         npy_intp dst_stride, npy_intp itemsize)
{
/*
 * Skip the "unaligned" versions on CPUs which support unaligned
 * memory accesses.
 */
#if !NPY_USE_UNALIGNED_ACCESS
    if (aligned) {
#endif/*!NPY_USE_UNALIGNED_ACCESS*/

        /* contiguous dst */
        if (itemsize != 0 && dst_stride == itemsize) {
            /* constant src */
            if (src_stride == 0) {
                switch (itemsize) {
/**begin repeat
 * #elsize = 1, 2, 4, 8, 16#
 */
                    case @elsize@:
                        return
                          &_aligned_strided_to_contig_size@elsize@_srcstride0;
/**end repeat**/
                }
            }
            /* contiguous src */
            else if (src_stride == itemsize) {
                return &_contig_to_contig;
            }
            /* general src */
            else {
                switch (itemsize) {
/**begin repeat
 * #elsize = 1, 2, 4, 8, 16#
 */
                    case @elsize@:
                        return &_aligned_strided_to_contig_size@elsize@;
/**end repeat**/
                }
            }

            return &_strided_to_strided;
        }
        /* general dst */
        else {
            /* constant src */
            if (src_stride == 0) {
                switch (itemsize) {
/**begin repeat
 * #elsize = 1, 2, 4, 8, 16#
 */
                    case @elsize@:
                        return
                          &_aligned_strided_to_strided_size@elsize@_srcstride0;
/**end repeat**/
                }
            }
            /* contiguous src */
            else if (src_stride == itemsize) {
                switch (itemsize) {
/**begin repeat
 * #elsize = 1, 2, 4, 8, 16#
 */
                    case @elsize@:
                        return &_aligned_contig_to_strided_size@elsize@;
/**end repeat**/
                }

                return &_strided_to_strided;
            }
            else {
                switch (itemsize) {
/**begin repeat
 * #elsize = 1, 2, 4, 8, 16#
 */
                    case @elsize@:
                        return &_aligned_strided_to_strided_size@elsize@;
/**end repeat**/
                }
            }
        }

#if !NPY_USE_UNALIGNED_ACCESS
    }
    else {
        /* contiguous dst */
        if (itemsize != 0 && dst_stride == itemsize) {
            /* contiguous src */
            if (itemsize != 0 && src_stride == itemsize) {
                return &_contig_to_contig;
            }
            /* general src */
            else {
                switch (itemsize) {
                    case 1:
                        return &_aligned_strided_to_contig_size1;
/**begin repeat
 * #elsize = 2, 4, 8, 16#
 */
                    case @elsize@:
                        return &_strided_to_contig_size@elsize@;
/**end repeat**/
                }
            }

            return &_strided_to_strided;
        }
        /* general dst */
        else {
            /* contiguous src */
            if (itemsize != 0 && src_stride == itemsize) {
                switch (itemsize) {
                    case 1:
                        return &_aligned_contig_to_strided_size1;
/**begin repeat
 * #elsize = 2, 4, 8, 16#
 */
                    case @elsize@:
                        return &_contig_to_strided_size@elsize@;
/**end repeat**/
                }

                return &_strided_to_strided;
            }
            /* general src */
            else {
                switch (itemsize) {
                    case 1:
                        return &_aligned_strided_to_strided_size1;
/**begin repeat
 * #elsize = 2, 4, 8, 16#
 */
                    case @elsize@:
                        return &_strided_to_strided_size@elsize@;
/**end repeat**/
                }
            }
        }
    }
#endif/*!NPY_USE_UNALIGNED_ACCESS*/

    return &_strided_to_strided;
}

/*
 * PyArray_GetStridedCopySwapFn and PyArray_GetStridedCopySwapPairFn are
 * nearly identical, so can do a repeat for them.
 */
/**begin repeat
 * #function = PyArray_GetStridedCopySwapFn, PyArray_GetStridedCopySwapPairFn#
 * #tag = , _pair#
 * #not_pair = 1, 0#
 */

NPY_NO_EXPORT PyArray_StridedUnaryOp *
@function@(int aligned, npy_intp src_stride,
                             npy_intp dst_stride, npy_intp itemsize)
{
/*
 * Skip the "unaligned" versions on CPUs which support unaligned
 * memory accesses.
 */
#if !NPY_USE_UNALIGNED_ACCESS
    if (aligned) {
#endif/*!NPY_USE_UNALIGNED_ACCESS*/

        /* contiguous dst */
        if (itemsize != 0 && dst_stride == itemsize) {
            /* constant src */
            if (src_stride == 0) {
                switch (itemsize) {
/**begin repeat1
 * #elsize = 2, 4, 8, 16#
 */
#if @not_pair@ || @elsize@ > 2
                case @elsize@:
                    return
                 &_aligned_swap@tag@_strided_to_contig_size@elsize@_srcstride0;
#endif
/**end repeat1**/
                }
            }
            /* contiguous src */
            else if (src_stride == itemsize) {
                switch (itemsize) {
/**begin repeat1
 * #elsize = 2, 4, 8, 16#
 */
#if @not_pair@ || @elsize@ > 2
                case @elsize@:
                    return &_aligned_swap@tag@_contig_to_contig_size@elsize@;
#endif
/**end repeat1**/
                }
            }
            /* general src */
            else {
                switch (itemsize) {
/**begin repeat1
 * #elsize = 2, 4, 8, 16#
 */
#if @not_pair@ || @elsize@ > 2
                case @elsize@:
                    return &_aligned_swap@tag@_strided_to_contig_size@elsize@;
#endif
/**end repeat1**/
                }
            }
        }
        /* general dst */
        else {
            /* constant src */
            if (src_stride == 0) {
                switch (itemsize) {
/**begin repeat1
 * #elsize = 2, 4, 8, 16#
 */
#if @not_pair@ || @elsize@ > 2
                case @elsize@:
                    return
                &_aligned_swap@tag@_strided_to_strided_size@elsize@_srcstride0;
#endif
/**end repeat1**/
                }
            }
            /* contiguous src */
            else if (src_stride == itemsize) {
                switch (itemsize) {
/**begin repeat1
 * #elsize = 2, 4, 8, 16#
 */
#if @not_pair@ || @elsize@ > 2
                case @elsize@:
                    return &_aligned_swap@tag@_contig_to_strided_size@elsize@;
#endif
/**end repeat1**/
                }

                return &_strided_to_strided;
            }
            else {
                switch (itemsize) {
/**begin repeat1
 * #elsize = 2, 4, 8, 16#
 */
#if @not_pair@ || @elsize@ > 2
                case @elsize@:
                    return &_aligned_swap@tag@_strided_to_strided_size@elsize@;
#endif
/**end repeat1**/
                }
            }
        }

#if !NPY_USE_UNALIGNED_ACCESS
    }
    else {
        /* contiguous dst */
        if (itemsize != 0 && dst_stride == itemsize) {
            /* contiguous src */
            if (itemsize != 0 && src_stride == itemsize) {
                switch (itemsize) {
/**begin repeat1
 * #elsize = 2, 4, 8, 16#
 */
#if @not_pair@ || @elsize@ > 2
                case @elsize@:
                    return &_swap@tag@_contig_to_contig_size@elsize@;
#endif
/**end repeat1**/
                }
            }
            /* general src */
            else {
                switch (itemsize) {
/**begin repeat1
 * #elsize = 2, 4, 8, 16#
 */
#if @not_pair@ || @elsize@ > 2
                    case @elsize@:
                        return &_swap@tag@_strided_to_contig_size@elsize@;
#endif
/**end repeat1**/
                }
            }

            return &_strided_to_strided;
        }
        /* general dst */
        else {
            /* contiguous src */
            if (itemsize != 0 && src_stride == itemsize) {
                switch (itemsize) {
/**begin repeat1
 * #elsize = 2, 4, 8, 16#
 */
#if @not_pair@ || @elsize@ > 2
                case @elsize@:
                    return &_swap@tag@_contig_to_strided_size@elsize@;
#endif
/**end repeat1**/
                }

                return &_strided_to_strided;
            }
            /* general src */
            else {
                switch (itemsize) {
/**begin repeat1
 * #elsize = 2, 4, 8, 16#
 */
#if @not_pair@ || @elsize@ > 2
                case @elsize@:
                    return &_swap@tag@_strided_to_strided_size@elsize@;
#endif
/**end repeat1**/
                }
            }
        }
    }
#endif/*!NPY_USE_UNALIGNED_ACCESS*/

    return &_swap@tag@_strided_to_strided;
}

/**end repeat**/

/************* STRIDED CASTING SPECIALIZED FUNCTIONS *************/

/**begin repeat
 *
 * #NAME1 = BOOL,
 *          UBYTE, USHORT, UINT, ULONG, ULONGLONG,
 *          BYTE, SHORT, INT, LONG, LONGLONG,
 *          HALF, FLOAT, DOUBLE, LONGDOUBLE,
 *          CFLOAT, CDOUBLE, CLONGDOUBLE#
 * #name1 = bool,
 *          ubyte, ushort, uint, ulong, ulonglong,
 *          byte, short, int, long, longlong,
 *          half, float, double, longdouble,
 *          cfloat, cdouble, clongdouble#
 * #type1 = npy_bool,
 *          npy_ubyte, npy_ushort, npy_uint, npy_ulong, npy_ulonglong,
 *          npy_byte, npy_short, npy_int, npy_long, npy_longlong,
 *          npy_half, npy_float, npy_double, npy_longdouble,
 *          npy_cfloat, npy_cdouble, npy_clongdouble#
 * #rtype1 = npy_bool,
 *           npy_ubyte, npy_ushort, npy_uint, npy_ulong, npy_ulonglong,
 *           npy_byte, npy_short, npy_int, npy_long, npy_longlong,
 *           npy_half, npy_float, npy_double, npy_longdouble,
 *           npy_float, npy_double, npy_longdouble#
 * #is_bool1 = 1, 0*17#
 * #is_half1 = 0*11, 1, 0*6#
 * #is_float1 = 0*12, 1, 0, 0, 1, 0, 0#
 * #is_double1 = 0*13, 1, 0, 0, 1, 0#
 * #is_complex1 = 0*15, 1*3#
 */

/**begin repeat1
 *
 * #NAME2 = BOOL,
 *          UBYTE, USHORT, UINT, ULONG, ULONGLONG,
 *          BYTE, SHORT, INT, LONG, LONGLONG,
 *          HALF, FLOAT, DOUBLE, LONGDOUBLE,
 *          CFLOAT, CDOUBLE, CLONGDOUBLE#
 * #name2 = bool,
 *          ubyte, ushort, uint, ulong, ulonglong,
 *          byte, short, int, long, longlong,
 *          half, float, double, longdouble,
 *          cfloat, cdouble, clongdouble#
 * #type2 = npy_bool,
 *          npy_ubyte, npy_ushort, npy_uint, npy_ulong, npy_ulonglong,
 *          npy_byte, npy_short, npy_int, npy_long, npy_longlong,
 *          npy_half, npy_float, npy_double, npy_longdouble,
 *          npy_cfloat, npy_cdouble, npy_clongdouble#
 * #rtype2 = npy_bool,
 *          npy_ubyte, npy_ushort, npy_uint, npy_ulong, npy_ulonglong,
 *          npy_byte, npy_short, npy_int, npy_long, npy_longlong,
 *          npy_half, npy_float, npy_double, npy_longdouble,
 *          npy_float, npy_double, npy_longdouble#
 * #is_bool2 = 1, 0*17#
 * #is_half2 = 0*11, 1, 0*6#
 * #is_float2 = 0*12, 1, 0, 0, 1, 0, 0#
 * #is_double2 = 0*13, 1, 0, 0, 1, 0#
 * #is_complex2 = 0*15, 1*3#
 */

/**begin repeat2
 * #prefix = _aligned,,_aligned_contig,_contig#
 * #aligned = 1,0,1,0#
 * #contig = 0,0,1,1#
 */

#if !(NPY_USE_UNALIGNED_ACCESS && !@aligned@)

/* For half types, don't use actual double/float types in conversion */
#if @is_half1@ || @is_half2@

#  if @is_float1@
#    define _TYPE1 npy_uint32
#  elif @is_double1@
#    define _TYPE1 npy_uint64
#  else
#    define _TYPE1 @rtype1@
#  endif

#  if @is_float2@
#    define _TYPE2 npy_uint32
#  elif @is_double2@
#    define _TYPE2 npy_uint64
#  else
#    define _TYPE2 @rtype2@
#  endif

#else

#define _TYPE1 @rtype1@
#define _TYPE2 @rtype2@

#endif

/* Determine an appropriate casting conversion function */
#if @is_half1@

#  if @is_float2@
#    define _CONVERT_FN(x) npy_halfbits_to_floatbits(x)
#  elif @is_double2@
#    define _CONVERT_FN(x) npy_halfbits_to_doublebits(x)
#  elif @is_half2@
#    define _CONVERT_FN(x) (x)
#  elif @is_bool2@
#    define _CONVERT_FN(x) ((npy_bool)!npy_half_iszero(x))
#  else
#    define _CONVERT_FN(x) ((_TYPE2)npy_half_to_float(x))
#  endif

#elif @is_half2@

#  if @is_float1@
#    define _CONVERT_FN(x) npy_floatbits_to_halfbits(x)
#  elif @is_double1@
#    define _CONVERT_FN(x) npy_doublebits_to_halfbits(x)
#  else
#    define _CONVERT_FN(x) npy_float_to_half((float)x)
#  endif

#else

#  if @is_bool2@
#    define _CONVERT_FN(x) ((npy_bool)(x != 0))
#  else
#    define _CONVERT_FN(x) ((_TYPE2)x)
#  endif

#endif

static void
@prefix@_cast_@name1@_to_@name2@(
                        char *dst, npy_intp dst_stride,
                        char *src, npy_intp src_stride,
                        npy_intp N, npy_intp NPY_UNUSED(src_itemsize),
                        NpyAuxData *NPY_UNUSED(data))
{
#if @is_complex1@
    _TYPE1 src_value[2];
#elif !@aligned@
    _TYPE1 src_value;
#endif
#if @is_complex2@
    _TYPE2 dst_value[2];
#elif !@aligned@
    _TYPE2 dst_value;
#endif

    /*printf("@prefix@_cast_@name1@_to_@name2@\n");*/

    while (N--) {
#if @aligned@
#  if @is_complex1@
        src_value[0] = ((_TYPE1 *)src)[0];
        src_value[1] = ((_TYPE1 *)src)[1];
#  elif !@aligned@
        src_value = *((_TYPE1 *)src);
#  endif
#else
        memmove(&src_value, src, sizeof(src_value));
#endif

/* Do the cast */
#if @is_complex1@
#  if @is_complex2@
    dst_value[0] = _CONVERT_FN(src_value[0]);
    dst_value[1] = _CONVERT_FN(src_value[1]);
#  elif !@aligned@
#    if @is_bool2@
       dst_value = _CONVERT_FN(src_value[0]) || _CONVERT_FN(src_value[1]);
#    else
       dst_value = _CONVERT_FN(src_value[0]);
#    endif
#  else
#    if @is_bool2@
       *(_TYPE2 *)dst = _CONVERT_FN(src_value[0]) || _CONVERT_FN(src_value[1]);
#    else
       *(_TYPE2 *)dst = _CONVERT_FN(src_value[0]);
#    endif
#  endif
#else
#  if @is_complex2@
#    if !@aligned@
    dst_value[0] = _CONVERT_FN(src_value);
#    else
    dst_value[0] = _CONVERT_FN(*(_TYPE1 *)src);
#    endif
    dst_value[1] = 0;
#  elif !@aligned@
    dst_value = _CONVERT_FN(src_value);
#  else
    *(_TYPE2 *)dst = _CONVERT_FN(*(_TYPE1 *)src);
#  endif
#endif

#if @aligned@
#  if @is_complex2@
        ((_TYPE2 *)dst)[0] = dst_value[0];
        ((_TYPE2 *)dst)[1] = dst_value[1];
#  elif !@aligned@
        *((_TYPE2 *)dst) = dst_value;
#  endif
#else
        memmove(dst, &dst_value, sizeof(dst_value));
#endif

#if @contig@
        dst += sizeof(@type2@);
        src += sizeof(@type1@);
#else
        dst += dst_stride;
        src += src_stride;
#endif
    }
}

#undef _CONVERT_FN
#undef _TYPE2
#undef _TYPE1

#endif

/**end repeat2**/

/**end repeat1**/

/**end repeat**/

NPY_NO_EXPORT PyArray_StridedUnaryOp *
PyArray_GetStridedNumericCastFn(int aligned, npy_intp src_stride,
                             npy_intp dst_stride,
                             int src_type_num, int dst_type_num)
{
    switch (src_type_num) {
/**begin repeat
 *
 * #NAME1 = BOOL,
 *          UBYTE, USHORT, UINT, ULONG, ULONGLONG,
 *          BYTE, SHORT, INT, LONG, LONGLONG,
 *          HALF, FLOAT, DOUBLE, LONGDOUBLE,
 *          CFLOAT, CDOUBLE, CLONGDOUBLE#
 * #name1 = bool,
 *          ubyte, ushort, uint, ulong, ulonglong,
 *          byte, short, int, long, longlong,
 *          half, float, double, longdouble,
 *          cfloat, cdouble, clongdouble#
 * #type1 = npy_bool,
 *          npy_ubyte, npy_ushort, npy_uint, npy_ulong, npy_ulonglong,
 *          npy_byte, npy_short, npy_int, npy_long, npy_longlong,
 *          npy_half, npy_float, npy_double, npy_longdouble,
 *          npy_cfloat, npy_cdouble, npy_clongdouble#
 */

        case NPY_@NAME1@:
            /*printf("test fn %d - second %d\n", NPY_@NAME1@, dst_type_num);*/
            switch (dst_type_num) {
/**begin repeat1
 *
 * #NAME2 = BOOL,
 *          UBYTE, USHORT, UINT, ULONG, ULONGLONG,
 *          BYTE, SHORT, INT, LONG, LONGLONG,
 *          HALF, FLOAT, DOUBLE, LONGDOUBLE,
 *          CFLOAT, CDOUBLE, CLONGDOUBLE#
 * #name2 = bool,
 *          ubyte, ushort, uint, ulong, ulonglong,
 *          byte, short, int, long, longlong,
 *          half, float, double, longdouble,
 *          cfloat, cdouble, clongdouble#
 * #type2 = npy_bool,
 *          npy_ubyte, npy_ushort, npy_uint, npy_ulong, npy_ulonglong,
 *          npy_byte, npy_short, npy_int, npy_long, npy_longlong,
 *          npy_half, npy_float, npy_double, npy_longdouble,
 *          npy_cfloat, npy_cdouble, npy_clongdouble#
 */

                case NPY_@NAME2@:
                    /*printf("ret fn %d %d\n", NPY_@NAME1@, NPY_@NAME2@);*/
#  if NPY_USE_UNALIGNED_ACCESS
                    if (src_stride == sizeof(@type1@) &&
                                dst_stride == sizeof(@type2@)) {
                        return &_aligned_contig_cast_@name1@_to_@name2@;
                    }
                    else {
                        return &_aligned_cast_@name1@_to_@name2@;
                    }
#  else
                    if (src_stride == sizeof(@type1@) &&
                                dst_stride == sizeof(@type2@)) {
                        return aligned ?
                                    &_aligned_contig_cast_@name1@_to_@name2@ :
                                    &_contig_cast_@name1@_to_@name2@;
                    }
                    else {
                        return aligned ? &_aligned_cast_@name1@_to_@name2@ :
                                         &_cast_@name1@_to_@name2@;
                    }
#  endif

/**end repeat1**/
            }
            /*printf("switched test fn %d - second %d\n", NPY_@NAME1@, dst_type_num);*/

/**end repeat**/
    }

    return NULL;
}


/****************** PRIMITIVE FLAT TO/FROM NDIM FUNCTIONS ******************/

/* See documentation of arguments in lowlevel_strided_loops.h */
NPY_NO_EXPORT npy_intp
PyArray_TransferNDimToStrided(npy_intp ndim,
                char *dst, npy_intp dst_stride,
                char *src, npy_intp *src_strides, npy_intp src_strides_inc,
                npy_intp *coords, npy_intp coords_inc,
                npy_intp *shape, npy_intp shape_inc,
                npy_intp count, npy_intp src_itemsize,
                PyArray_StridedUnaryOp *stransfer,
                NpyAuxData *data)
{
    npy_intp i, M, N, coord0, shape0, src_stride0, coord1, shape1, src_stride1;

    /* Finish off dimension 0 */
    coord0 = coords[0];
    shape0 = shape[0];
    src_stride0 = src_strides[0];
    N = shape0 - coord0;
    if (N >= count) {
        stransfer(dst, dst_stride, src, src_stride0, count, src_itemsize, data);
        return 0;
    }
    stransfer(dst, dst_stride, src, src_stride0, N, src_itemsize, data);
    count -= N;

    /* If it's 1-dimensional, there's no more to copy */
    if (ndim == 1) {
        return count;
    }

    /* Adjust the src and dst pointers */
    coord1 = (coords + coords_inc)[0];
    shape1 = (shape + shape_inc)[0];
    src_stride1 = (src_strides + src_strides_inc)[0];
    src = src - coord0*src_stride0 + src_stride1;
    dst += N*dst_stride;

    /* Finish off dimension 1 */
    M = (shape1 - coord1 - 1);
    N = shape0*M;
    for (i = 0; i < M; ++i) {
        if (shape0 >= count) {
            stransfer(dst, dst_stride, src, src_stride0,
                        count, src_itemsize, data);
            return 0;
        }
        else {
            stransfer(dst, dst_stride, src, src_stride0,
                        shape0, src_itemsize, data);
        }
        count -= shape0;
        src += src_stride1;
        dst += shape0*dst_stride;
    }

    /* If it's 2-dimensional, there's no more to copy */
    if (ndim == 2) {
        return count;
    }

    /* General-case loop for everything else */
    else {
        /* Iteration structure for dimensions 2 and up */
        struct {
            npy_intp coord, shape, src_stride;
        } it[NPY_MAXDIMS];

        /* Copy the coordinates and shape */
        coords += 2*coords_inc;
        shape += 2*shape_inc;
        src_strides += 2*src_strides_inc;
        for (i = 0; i < ndim-2; ++i) {
            it[i].coord = coords[0];
            it[i].shape = shape[0];
            it[i].src_stride = src_strides[0];
            coords += coords_inc;
            shape += shape_inc;
            src_strides += src_strides_inc;
        }

        for (;;) {
            /* Adjust the src pointer from the dimension 0 and 1 loop */
            src = src - shape1*src_stride1;

            /* Increment to the next coordinate */
            for (i = 0; i < ndim-2; ++i) {
                src += it[i].src_stride;
                if (++it[i].coord >= it[i].shape) {
                    it[i].coord = 0;
                    src -= it[i].src_stride*it[i].shape;
                }
                else {
                    break;
                }
            }
            /* If the last dimension rolled over, we're done */
            if (i == ndim-2) {
                return count;
            }

            /* A loop for dimensions 0 and 1 */
            for (i = 0; i < shape1; ++i) {
                if (shape0 >= count) {
                    stransfer(dst, dst_stride, src, src_stride0,
                                count, src_itemsize, data);
                    return 0;
                }
                else {
                    stransfer(dst, dst_stride, src, src_stride0,
                                shape0, src_itemsize, data);
                }
                count -= shape0;
                src += src_stride1;
                dst += shape0*dst_stride;
            }
        }
    }
}

/* See documentation of arguments in lowlevel_strided_loops.h */
NPY_NO_EXPORT npy_intp
PyArray_TransferStridedToNDim(npy_intp ndim,
                char *dst, npy_intp *dst_strides, npy_intp dst_strides_inc,
                char *src, npy_intp src_stride,
                npy_intp *coords, npy_intp coords_inc,
                npy_intp *shape, npy_intp shape_inc,
                npy_intp count, npy_intp src_itemsize,
                PyArray_StridedUnaryOp *stransfer,
                NpyAuxData *data)
{
    npy_intp i, M, N, coord0, shape0, dst_stride0, coord1, shape1, dst_stride1;

    /* Finish off dimension 0 */
    coord0 = coords[0];
    shape0 = shape[0];
    dst_stride0 = dst_strides[0];
    N = shape0 - coord0;
    if (N >= count) {
        stransfer(dst, dst_stride0, src, src_stride, count, src_itemsize, data);
        return 0;
    }
    stransfer(dst, dst_stride0, src, src_stride, N, src_itemsize, data);
    count -= N;

    /* If it's 1-dimensional, there's no more to copy */
    if (ndim == 1) {
        return count;
    }

    /* Adjust the src and dst pointers */
    coord1 = (coords + coords_inc)[0];
    shape1 = (shape + shape_inc)[0];
    dst_stride1 = (dst_strides + dst_strides_inc)[0];
    dst = dst - coord0*dst_stride0 + dst_stride1;
    src += N*src_stride;

    /* Finish off dimension 1 */
    M = (shape1 - coord1 - 1);
    N = shape0*M;
    for (i = 0; i < M; ++i) {
        if (shape0 >= count) {
            stransfer(dst, dst_stride0, src, src_stride,
                        count, src_itemsize, data);
            return 0;
        }
        else {
            stransfer(dst, dst_stride0, src, src_stride,
                        shape0, src_itemsize, data);
        }
        count -= shape0;
        dst += dst_stride1;
        src += shape0*src_stride;
    }

    /* If it's 2-dimensional, there's no more to copy */
    if (ndim == 2) {
        return count;
    }

    /* General-case loop for everything else */
    else {
        /* Iteration structure for dimensions 2 and up */
        struct {
            npy_intp coord, shape, dst_stride;
        } it[NPY_MAXDIMS];

        /* Copy the coordinates and shape */
        coords += 2*coords_inc;
        shape += 2*shape_inc;
        dst_strides += 2*dst_strides_inc;
        for (i = 0; i < ndim-2; ++i) {
            it[i].coord = coords[0];
            it[i].shape = shape[0];
            it[i].dst_stride = dst_strides[0];
            coords += coords_inc;
            shape += shape_inc;
            dst_strides += dst_strides_inc;
        }

        for (;;) {
            /* Adjust the dst pointer from the dimension 0 and 1 loop */
            dst = dst - shape1*dst_stride1;

            /* Increment to the next coordinate */
            for (i = 0; i < ndim-2; ++i) {
                dst += it[i].dst_stride;
                if (++it[i].coord >= it[i].shape) {
                    it[i].coord = 0;
                    dst -= it[i].dst_stride*it[i].shape;
                }
                else {
                    break;
                }
            }
            /* If the last dimension rolled over, we're done */
            if (i == ndim-2) {
                return count;
            }

            /* A loop for dimensions 0 and 1 */
            for (i = 0; i < shape1; ++i) {
                if (shape0 >= count) {
                    stransfer(dst, dst_stride0, src, src_stride,
                                count, src_itemsize, data);
                    return 0;
                }
                else {
                    stransfer(dst, dst_stride0, src, src_stride,
                                shape0, src_itemsize, data);
                }
                count -= shape0;
                dst += dst_stride1;
                src += shape0*src_stride;
            }
        }
    }
}

/* See documentation of arguments in lowlevel_strided_loops.h */
NPY_NO_EXPORT npy_intp
PyArray_TransferMaskedStridedToNDim(npy_intp ndim,
                char *dst, npy_intp *dst_strides, npy_intp dst_strides_inc,
                char *src, npy_intp src_stride,
                npy_uint8 *mask, npy_intp mask_stride,
                npy_intp *coords, npy_intp coords_inc,
                npy_intp *shape, npy_intp shape_inc,
                npy_intp count, npy_intp src_itemsize,
                PyArray_MaskedStridedUnaryOp *stransfer,
                NpyAuxData *data)
{
    npy_intp i, M, N, coord0, shape0, dst_stride0, coord1, shape1, dst_stride1;

    /* Finish off dimension 0 */
    coord0 = coords[0];
    shape0 = shape[0];
    dst_stride0 = dst_strides[0];
    N = shape0 - coord0;
    if (N >= count) {
        stransfer(dst, dst_stride0,
                    src, src_stride,
                    mask, mask_stride,
                    count, src_itemsize, data);
        return 0;
    }
    stransfer(dst, dst_stride0,
                src, src_stride,
                mask, mask_stride,
                N, src_itemsize, data);
    count -= N;

    /* If it's 1-dimensional, there's no more to copy */
    if (ndim == 1) {
        return count;
    }

    /* Adjust the src and dst pointers */
    coord1 = (coords + coords_inc)[0];
    shape1 = (shape + shape_inc)[0];
    dst_stride1 = (dst_strides + dst_strides_inc)[0];
    dst = dst - coord0*dst_stride0 + dst_stride1;
    src += N*src_stride;
    mask += N*mask_stride;

    /* Finish off dimension 1 */
    M = (shape1 - coord1 - 1);
    N = shape0*M;
    for (i = 0; i < M; ++i) {
        if (shape0 >= count) {
            stransfer(dst, dst_stride0,
                        src, src_stride,
                        mask, mask_stride,
                        count, src_itemsize, data);
            return 0;
        }
        else {
            stransfer(dst, dst_stride0,
                        src, src_stride,
                        mask, mask_stride,
                        shape0, src_itemsize, data);
        }
        count -= shape0;
        dst += dst_stride1;
        src += shape0*src_stride;
        mask += shape0*mask_stride;
    }

    /* If it's 2-dimensional, there's no more to copy */
    if (ndim == 2) {
        return count;
    }

    /* General-case loop for everything else */
    else {
        /* Iteration structure for dimensions 2 and up */
        struct {
            npy_intp coord, shape, dst_stride;
        } it[NPY_MAXDIMS];

        /* Copy the coordinates and shape */
        coords += 2*coords_inc;
        shape += 2*shape_inc;
        dst_strides += 2*dst_strides_inc;
        for (i = 0; i < ndim-2; ++i) {
            it[i].coord = coords[0];
            it[i].shape = shape[0];
            it[i].dst_stride = dst_strides[0];
            coords += coords_inc;
            shape += shape_inc;
            dst_strides += dst_strides_inc;
        }

        for (;;) {
            /* Adjust the dst pointer from the dimension 0 and 1 loop */
            dst = dst - shape1*dst_stride1;

            /* Increment to the next coordinate */
            for (i = 0; i < ndim-2; ++i) {
                dst += it[i].dst_stride;
                if (++it[i].coord >= it[i].shape) {
                    it[i].coord = 0;
                    dst -= it[i].dst_stride*it[i].shape;
                }
                else {
                    break;
                }
            }
            /* If the last dimension rolled over, we're done */
            if (i == ndim-2) {
                return count;
            }

            /* A loop for dimensions 0 and 1 */
            for (i = 0; i < shape1; ++i) {
                if (shape0 >= count) {
                    stransfer(dst, dst_stride0,
                                src, src_stride,
                                mask, mask_stride,
                                count, src_itemsize, data);
                    return 0;
                }
                else {
                    stransfer(dst, dst_stride0,
                                src, src_stride,
                                mask, mask_stride,
                                shape0, src_itemsize, data);
                }
                count -= shape0;
                dst += dst_stride1;
                src += shape0*src_stride;
                mask += shape0*mask_stride;
            }
        }
    }
}