Sergey Sharybin
cba0858ccd
Pre-4.8 GCC had a bug which lead to non-exposed __builtin_bswap16() symbol. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52624 for details.
105 lines
2.8 KiB
C++
105 lines
2.8 KiB
C++
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Contributor(s): Campbell Barton
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/* only include from header */
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#ifndef __BLI_ENDIAN_SWITCH_H__
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# error "this file isnt to be directly included"
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#endif
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#ifndef __BLI_ENDIAN_SWITCH_INLINE_H__
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#define __BLI_ENDIAN_SWITCH_INLINE_H__
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/** \file blender/blenlib/BLI_endian_switch_inline.h
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* \ingroup bli
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*/
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/* note: using a temp char to switch endian is a lot slower,
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* use bit shifting instead. */
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/* *** 16 *** */
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BLI_INLINE void BLI_endian_switch_int16(short *val)
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{
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BLI_endian_switch_uint16((unsigned short *)val);
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}
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BLI_INLINE void BLI_endian_switch_uint16(unsigned short *val)
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{
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#if (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 408)) /* gcc4.8+ only */
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*val = __builtin_bswap16(*val);
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#else
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unsigned short tval = *val;
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*val = (tval >> 8) |
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(tval << 8);
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#endif
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}
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/* *** 32 *** */
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BLI_INLINE void BLI_endian_switch_int32(int *val)
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{
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BLI_endian_switch_uint32((unsigned int *)val);
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}
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BLI_INLINE void BLI_endian_switch_uint32(unsigned int *val)
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{
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#ifdef __GNUC__
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*val = __builtin_bswap32(*val);
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#else
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unsigned int tval = *val;
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*val = ((tval >> 24)) |
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((tval << 8) & 0x00ff0000) |
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((tval >> 8) & 0x0000ff00) |
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((tval << 24));
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#endif
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}
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BLI_INLINE void BLI_endian_switch_float(float *val)
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{
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BLI_endian_switch_uint32((unsigned int *)val);
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}
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/* *** 64 *** */
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BLI_INLINE void BLI_endian_switch_int64(int64_t *val)
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{
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BLI_endian_switch_uint64((uint64_t *)val);
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}
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BLI_INLINE void BLI_endian_switch_uint64(uint64_t *val)
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{
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#ifdef __GNUC__
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*val = __builtin_bswap64(*val);
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#else
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uint64_t tval = *val;
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*val = ((tval >> 56)) |
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((tval << 40) & 0x00ff000000000000ll) |
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((tval << 24) & 0x0000ff0000000000ll) |
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((tval << 8) & 0x000000ff00000000ll) |
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((tval >> 8) & 0x00000000ff000000ll) |
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((tval >> 24) & 0x0000000000ff0000ll) |
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((tval >> 40) & 0x000000000000ff00ll) |
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((tval << 56));
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#endif
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}
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BLI_INLINE void BLI_endian_switch_double(double *val)
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{
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BLI_endian_switch_uint64((uint64_t *)val);
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}
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#endif /* __BLI_ENDIAN_SWITCH_INLINE_H__ */
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