godot/thirdparty/bullet/BulletCollision/Gimpact/gim_memory.h

#ifndef GIM_MEMORY_H_INCLUDED
#define GIM_MEMORY_H_INCLUDED
/*! \file gim_memory.h
\author Francisco Leon Najera
*/
/*
-----------------------------------------------------------------------------
This source file is part of GIMPACT Library.

For the latest info, see http://gimpact.sourceforge.net/

Copyright (c) 2006 Francisco Leon Najera. C.C. 80087371.
email: projectileman@yahoo.com

 This library is free software; you can redistribute it and/or
 modify it under the terms of EITHER:
   (1) The GNU Lesser General Public License as published by the Free
       Software Foundation; either version 2.1 of the License, or (at
       your option) any later version. The text of the GNU Lesser
       General Public License is included with this library in the
       file GIMPACT-LICENSE-LGPL.TXT.
   (2) The BSD-style license that is included with this library in
       the file GIMPACT-LICENSE-BSD.TXT.
   (3) The zlib/libpng license that is included with this library in
       the file GIMPACT-LICENSE-ZLIB.TXT.

 This library 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 files
 GIMPACT-LICENSE-LGPL.TXT, GIMPACT-LICENSE-ZLIB.TXT and GIMPACT-LICENSE-BSD.TXT for more details.

-----------------------------------------------------------------------------
*/

#include "gim_math.h"
#include <string.h>

#ifdef PREFETCH
#include <xmmintrin.h>  // for prefetch
#define pfval 64
#define pfval2 128
//! Prefetch 64
#define pf(_x, _i) _mm_prefetch((void *)(_x + _i + pfval), 0)
//! Prefetch 128
#define pf2(_x, _i) _mm_prefetch((void *)(_x + _i + pfval2), 0)
#else
//! Prefetch 64
#define pf(_x, _i)
//! Prefetch 128
#define pf2(_x, _i)
#endif

///Functions for manip packed arrays of numbers
#define GIM_COPY_ARRAYS(dest_array, source_array, element_count) \
	{                                                            \
		for (GUINT _i_ = 0; _i_ < element_count; ++_i_)          \
		{                                                        \
			dest_array[_i_] = source_array[_i_];                 \
		}                                                        \
	}

#define GIM_COPY_ARRAYS_1(dest_array, source_array, element_count, copy_macro) \
	{                                                                          \
		for (GUINT _i_ = 0; _i_ < element_count; ++_i_)                        \
		{                                                                      \
			copy_macro(dest_array[_i_], source_array[_i_]);                    \
		}                                                                      \
	}

#define GIM_ZERO_ARRAY(array, element_count)            \
	{                                                   \
		for (GUINT _i_ = 0; _i_ < element_count; ++_i_) \
		{                                               \
			array[_i_] = 0;                             \
		}                                               \
	}

#define GIM_CONSTANT_ARRAY(array, element_count, constant) \
	{                                                      \
		for (GUINT _i_ = 0; _i_ < element_count; ++_i_)    \
		{                                                  \
			array[_i_] = constant;                         \
		}                                                  \
	}

///Function prototypes to allocate and free memory.
typedef void *gim_alloc_function(size_t size);
typedef void *gim_alloca_function(size_t size);  //Allocs on the heap
typedef void *gim_realloc_function(void *ptr, size_t oldsize, size_t newsize);
typedef void gim_free_function(void *ptr);

///Memory Function Handlers
///set new memory management functions. if fn is 0, the default handlers are used.
void gim_set_alloc_handler(gim_alloc_function *fn);
void gim_set_alloca_handler(gim_alloca_function *fn);
void gim_set_realloc_handler(gim_realloc_function *fn);
void gim_set_free_handler(gim_free_function *fn);

///get current memory management functions.
gim_alloc_function *gim_get_alloc_handler(void);
gim_alloca_function *gim_get_alloca_handler(void);
gim_realloc_function *gim_get_realloc_handler(void);
gim_free_function *gim_get_free_handler(void);

///Standar Memory functions
void *gim_alloc(size_t size);
void *gim_alloca(size_t size);
void *gim_realloc(void *ptr, size_t oldsize, size_t newsize);
void gim_free(void *ptr);

#if defined(_WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__)
#define GIM_SIMD_MEMORY 1
#endif

//! SIMD POINTER INTEGER
#define SIMD_T GUINT64
//! SIMD INTEGER SIZE
#define SIMD_T_SIZE sizeof(SIMD_T)

inline void gim_simd_memcpy(void *dst, const void *src, size_t copysize)
{
#ifdef GIM_SIMD_MEMORY
	/*
//'long long int' is incompatible with visual studio 6...
    //copy words
    SIMD_T * ui_src_ptr = (SIMD_T *)src;
    SIMD_T * ui_dst_ptr = (SIMD_T *)dst;
    while(copysize>=SIMD_T_SIZE)
    {
        *(ui_dst_ptr++) = *(ui_src_ptr++);
        copysize-=SIMD_T_SIZE;
    }
    if(copysize==0) return;
*/

	char *c_src_ptr = (char *)src;
	char *c_dst_ptr = (char *)dst;
	while (copysize > 0)
	{
		*(c_dst_ptr++) = *(c_src_ptr++);
		copysize--;
	}
	return;
#else
	memcpy(dst, src, copysize);
#endif
}

template <class T>
inline void gim_swap_elements(T *_array, size_t _i, size_t _j)
{
	T _e_tmp_ = _array[_i];
	_array[_i] = _array[_j];
	_array[_j] = _e_tmp_;
}

template <class T>
inline void gim_swap_elements_memcpy(T *_array, size_t _i, size_t _j)
{
	char _e_tmp_[sizeof(T)];
	gim_simd_memcpy(_e_tmp_, &_array[_i], sizeof(T));
	gim_simd_memcpy(&_array[_i], &_array[_j], sizeof(T));
	gim_simd_memcpy(&_array[_j], _e_tmp_, sizeof(T));
}

template <int SIZE>
inline void gim_swap_elements_ptr(char *_array, size_t _i, size_t _j)
{
	char _e_tmp_[SIZE];
	_i *= SIZE;
	_j *= SIZE;
	gim_simd_memcpy(_e_tmp_, _array + _i, SIZE);
	gim_simd_memcpy(_array + _i, _array + _j, SIZE);
	gim_simd_memcpy(_array + _j, _e_tmp_, SIZE);
}

#endif  // GIM_MEMORY_H_INCLUDED