BLI_endian_switch_inline.h

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include "BLI_compiler_compat.h"
#include "BLI_sys_types.h"
 
/* only include from header */
#ifndef __BLI_ENDIAN_SWITCH_H__
#  error "this file isn't to be directly included"
#endif

 
/* NOTE: using a temp char to switch endian is a lot slower,
 * use bit shifting instead. */
 
/* *** 16 *** */
 
BLI_INLINE void BLI_endian_switch_int16(short *val)
{
  BLI_endian_switch_uint16((unsigned short *)val);
}
BLI_INLINE void BLI_endian_switch_uint16(unsigned short *val)
{
#ifdef __GNUC__
  *val = __builtin_bswap16(*val);
#else
  unsigned short tval = *val;
  *val = (tval >> 8) | (tval << 8);
#endif
}
 
/* *** 32 *** */
 
BLI_INLINE void BLI_endian_switch_int32(int *val)
{
  BLI_endian_switch_uint32((unsigned int *)val);
}
BLI_INLINE void BLI_endian_switch_uint32(unsigned int *val)
{
#ifdef __GNUC__
  *val = __builtin_bswap32(*val);
#else
  unsigned int tval = *val;
  *val = ((tval >> 24)) | ((tval << 8) & 0x00ff0000) | ((tval >> 8) & 0x0000ff00) | ((tval << 24));
#endif
}
BLI_INLINE void BLI_endian_switch_float(float *val)
{
  BLI_endian_switch_uint32((unsigned int *)val);
}
 
/* *** 64 *** */
 
BLI_INLINE void BLI_endian_switch_int64(int64_t *val)
{
  BLI_endian_switch_uint64((uint64_t *)val);
}
BLI_INLINE void BLI_endian_switch_uint64(uint64_t *val)
{
#ifdef __GNUC__
  *val = __builtin_bswap64(*val);
#else
  uint64_t tval = *val;
  *val = ((tval >> 56)) | ((tval << 40) & 0x00ff000000000000ll) |
         ((tval << 24) & 0x0000ff0000000000ll) | ((tval << 8) & 0x000000ff00000000ll) |
         ((tval >> 8) & 0x00000000ff000000ll) | ((tval >> 24) & 0x0000000000ff0000ll) |
         ((tval >> 40) & 0x000000000000ff00ll) | ((tval << 56));
#endif
}
BLI_INLINE void BLI_endian_switch_double(double *val)
{
  BLI_endian_switch_uint64((uint64_t *)val);
}