Use hardware support for byteswapping on glibc x86 etc.
On Fedora 19 x86-64, the new bswap_64 needs 1 instruction,
whereas the old swap64 needed 30.
* admin/merge-gnulib (GNULIB_MODULES): Add byteswap.
* lib/byteswap.in.h, m4/byteswap.m4: New files, copied from Gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/fringe.c (init_fringe_bitmap) [WORDS_BIGENDIAN]:
* src/sound.c (le2hl, le2hs, be2hl) [!WINDOWSNT]:
Use byteswap.h's macros to swap bytes.
* src/lisp.h (swap16, swap32, swap64): Remove.
All uses replaced by bswap_16, bswap_32, bswap_64.
2013-10-04 07:36:22 +00:00
|
|
|
/* byteswap.h - Byte swapping
|
2024-01-02 01:47:10 +00:00
|
|
|
Copyright (C) 2005, 2007, 2009-2024 Free Software Foundation, Inc.
|
Use hardware support for byteswapping on glibc x86 etc.
On Fedora 19 x86-64, the new bswap_64 needs 1 instruction,
whereas the old swap64 needed 30.
* admin/merge-gnulib (GNULIB_MODULES): Add byteswap.
* lib/byteswap.in.h, m4/byteswap.m4: New files, copied from Gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/fringe.c (init_fringe_bitmap) [WORDS_BIGENDIAN]:
* src/sound.c (le2hl, le2hs, be2hl) [!WINDOWSNT]:
Use byteswap.h's macros to swap bytes.
* src/lisp.h (swap16, swap32, swap64): Remove.
All uses replaced by bswap_16, bswap_32, bswap_64.
2013-10-04 07:36:22 +00:00
|
|
|
Written by Oskar Liljeblad <oskar@osk.mine.nu>, 2005.
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|
|
Update from Gnulib
Make the following changes by hand, and run 'admin/merge-gnulib'.
* .gitignore: Add lib/malloc/*.gl.h.
* admin/merge-gnulib: Copy lib/af_alg.h and lib/save-cwd.h
directly from Gnulib, without worrying about Gnulib modules,
as these files are special cases.
(AVOIDED_MODULES): Remove malloc-posix.
* lib/malloc.c, lib/realloc.c, m4/malloc.m4, m4/realloc.m4:
* m4/year2038.m4: New files, copied from Gnulib.
* lib/malloca.c, lib/malloca.h:
* m4/close-stream.m4, m4/glibc21.m4, m4/malloca.m4:
Remove. These are either no longer present in Gnulib, or are no
longer needed by modules that Emacs uses.
* oldXMenu/AddPane.c, oldXmenu/Addsel.c: Include XmenuInt.h first;
needed for new Gnulib.
* src/xmenu.c: Call emacs_abort, not abort.
2021-10-04 19:11:39 +00:00
|
|
|
This file is free software: you can redistribute it and/or modify
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|
it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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|
|
|
License, or (at your option) any later version.
|
Use hardware support for byteswapping on glibc x86 etc.
On Fedora 19 x86-64, the new bswap_64 needs 1 instruction,
whereas the old swap64 needed 30.
* admin/merge-gnulib (GNULIB_MODULES): Add byteswap.
* lib/byteswap.in.h, m4/byteswap.m4: New files, copied from Gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/fringe.c (init_fringe_bitmap) [WORDS_BIGENDIAN]:
* src/sound.c (le2hl, le2hs, be2hl) [!WINDOWSNT]:
Use byteswap.h's macros to swap bytes.
* src/lisp.h (swap16, swap32, swap64): Remove.
All uses replaced by bswap_16, bswap_32, bswap_64.
2013-10-04 07:36:22 +00:00
|
|
|
|
Update from Gnulib
Make the following changes by hand, and run 'admin/merge-gnulib'.
* .gitignore: Add lib/malloc/*.gl.h.
* admin/merge-gnulib: Copy lib/af_alg.h and lib/save-cwd.h
directly from Gnulib, without worrying about Gnulib modules,
as these files are special cases.
(AVOIDED_MODULES): Remove malloc-posix.
* lib/malloc.c, lib/realloc.c, m4/malloc.m4, m4/realloc.m4:
* m4/year2038.m4: New files, copied from Gnulib.
* lib/malloca.c, lib/malloca.h:
* m4/close-stream.m4, m4/glibc21.m4, m4/malloca.m4:
Remove. These are either no longer present in Gnulib, or are no
longer needed by modules that Emacs uses.
* oldXMenu/AddPane.c, oldXmenu/Addsel.c: Include XmenuInt.h first;
needed for new Gnulib.
* src/xmenu.c: Call emacs_abort, not abort.
2021-10-04 19:11:39 +00:00
|
|
|
This file is distributed in the hope that it will be useful,
|
Use hardware support for byteswapping on glibc x86 etc.
On Fedora 19 x86-64, the new bswap_64 needs 1 instruction,
whereas the old swap64 needed 30.
* admin/merge-gnulib (GNULIB_MODULES): Add byteswap.
* lib/byteswap.in.h, m4/byteswap.m4: New files, copied from Gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/fringe.c (init_fringe_bitmap) [WORDS_BIGENDIAN]:
* src/sound.c (le2hl, le2hs, be2hl) [!WINDOWSNT]:
Use byteswap.h's macros to swap bytes.
* src/lisp.h (swap16, swap32, swap64): Remove.
All uses replaced by bswap_16, bswap_32, bswap_64.
2013-10-04 07:36:22 +00:00
|
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
Update from Gnulib
Make the following changes by hand, and run 'admin/merge-gnulib'.
* .gitignore: Add lib/malloc/*.gl.h.
* admin/merge-gnulib: Copy lib/af_alg.h and lib/save-cwd.h
directly from Gnulib, without worrying about Gnulib modules,
as these files are special cases.
(AVOIDED_MODULES): Remove malloc-posix.
* lib/malloc.c, lib/realloc.c, m4/malloc.m4, m4/realloc.m4:
* m4/year2038.m4: New files, copied from Gnulib.
* lib/malloca.c, lib/malloca.h:
* m4/close-stream.m4, m4/glibc21.m4, m4/malloca.m4:
Remove. These are either no longer present in Gnulib, or are no
longer needed by modules that Emacs uses.
* oldXMenu/AddPane.c, oldXmenu/Addsel.c: Include XmenuInt.h first;
needed for new Gnulib.
* src/xmenu.c: Call emacs_abort, not abort.
2021-10-04 19:11:39 +00:00
|
|
|
GNU Lesser General Public License for more details.
|
Use hardware support for byteswapping on glibc x86 etc.
On Fedora 19 x86-64, the new bswap_64 needs 1 instruction,
whereas the old swap64 needed 30.
* admin/merge-gnulib (GNULIB_MODULES): Add byteswap.
* lib/byteswap.in.h, m4/byteswap.m4: New files, copied from Gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/fringe.c (init_fringe_bitmap) [WORDS_BIGENDIAN]:
* src/sound.c (le2hl, le2hs, be2hl) [!WINDOWSNT]:
Use byteswap.h's macros to swap bytes.
* src/lisp.h (swap16, swap32, swap64): Remove.
All uses replaced by bswap_16, bswap_32, bswap_64.
2013-10-04 07:36:22 +00:00
|
|
|
|
Update from Gnulib
Make the following changes by hand, and run 'admin/merge-gnulib'.
* .gitignore: Add lib/malloc/*.gl.h.
* admin/merge-gnulib: Copy lib/af_alg.h and lib/save-cwd.h
directly from Gnulib, without worrying about Gnulib modules,
as these files are special cases.
(AVOIDED_MODULES): Remove malloc-posix.
* lib/malloc.c, lib/realloc.c, m4/malloc.m4, m4/realloc.m4:
* m4/year2038.m4: New files, copied from Gnulib.
* lib/malloca.c, lib/malloca.h:
* m4/close-stream.m4, m4/glibc21.m4, m4/malloca.m4:
Remove. These are either no longer present in Gnulib, or are no
longer needed by modules that Emacs uses.
* oldXMenu/AddPane.c, oldXmenu/Addsel.c: Include XmenuInt.h first;
needed for new Gnulib.
* src/xmenu.c: Call emacs_abort, not abort.
2021-10-04 19:11:39 +00:00
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
2017-09-13 09:07:03 +00:00
|
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
Use hardware support for byteswapping on glibc x86 etc.
On Fedora 19 x86-64, the new bswap_64 needs 1 instruction,
whereas the old swap64 needed 30.
* admin/merge-gnulib (GNULIB_MODULES): Add byteswap.
* lib/byteswap.in.h, m4/byteswap.m4: New files, copied from Gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/fringe.c (init_fringe_bitmap) [WORDS_BIGENDIAN]:
* src/sound.c (le2hl, le2hs, be2hl) [!WINDOWSNT]:
Use byteswap.h's macros to swap bytes.
* src/lisp.h (swap16, swap32, swap64): Remove.
All uses replaced by bswap_16, bswap_32, bswap_64.
2013-10-04 07:36:22 +00:00
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#ifndef _GL_BYTESWAP_H
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2024-05-18 16:33:03 +00:00
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#define _GL_BYTESWAP_H 1
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/* This file uses _GL_INLINE. */
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#if !_GL_CONFIG_H_INCLUDED
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#error "Please include config.h first."
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#endif
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#include <stdint.h>
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_GL_INLINE_HEADER_BEGIN
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#ifndef _GL_BYTESWAP_INLINE
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# define _GL_BYTESWAP_INLINE _GL_INLINE
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
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# define _GL_BYTESWAP_HAS_BUILTIN_BSWAP16 true
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|
#elif defined __has_builtin
|
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# if __has_builtin (__builtin_bswap16)
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# define _GL_BYTESWAP_HAS_BUILTIN_BSWAP16 true
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# endif
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#endif
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#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
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# define _GL_BYTESWAP_HAS_BUILTIN_BSWAP32 true
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# define _GL_BYTESWAP_HAS_BUILTIN_BSWAP64 true
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#elif defined __has_builtin
|
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|
|
# if __has_builtin (__builtin_bswap32)
|
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# define _GL_BYTESWAP_HAS_BUILTIN_BSWAP32 true
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|
# endif
|
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|
|
# if __has_builtin (__builtin_bswap64)
|
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|
# define _GL_BYTESWAP_HAS_BUILTIN_BSWAP64 true
|
|
|
|
# endif
|
|
|
|
#endif
|
Use hardware support for byteswapping on glibc x86 etc.
On Fedora 19 x86-64, the new bswap_64 needs 1 instruction,
whereas the old swap64 needed 30.
* admin/merge-gnulib (GNULIB_MODULES): Add byteswap.
* lib/byteswap.in.h, m4/byteswap.m4: New files, copied from Gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/fringe.c (init_fringe_bitmap) [WORDS_BIGENDIAN]:
* src/sound.c (le2hl, le2hs, be2hl) [!WINDOWSNT]:
Use byteswap.h's macros to swap bytes.
* src/lisp.h (swap16, swap32, swap64): Remove.
All uses replaced by bswap_16, bswap_32, bswap_64.
2013-10-04 07:36:22 +00:00
|
|
|
|
|
|
|
/* Given an unsigned 16-bit argument X, return the value corresponding to
|
|
|
|
X with reversed byte order. */
|
2024-05-18 16:33:03 +00:00
|
|
|
_GL_BYTESWAP_INLINE uint_least16_t
|
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|
|
bswap_16 (uint_least16_t x)
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|
|
|
{
|
|
|
|
#ifdef _GL_BYTESWAP_HAS_BUILTIN_BSWAP16
|
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|
return __builtin_bswap16 (x);
|
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|
#else
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|
uint_fast16_t mask = 0xff;
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|
return ( (x & mask << 8 * 1) >> 8 * 1
|
|
|
|
| (x & mask << 8 * 0) << 8 * 1);
|
|
|
|
#endif
|
|
|
|
}
|
Use hardware support for byteswapping on glibc x86 etc.
On Fedora 19 x86-64, the new bswap_64 needs 1 instruction,
whereas the old swap64 needed 30.
* admin/merge-gnulib (GNULIB_MODULES): Add byteswap.
* lib/byteswap.in.h, m4/byteswap.m4: New files, copied from Gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/fringe.c (init_fringe_bitmap) [WORDS_BIGENDIAN]:
* src/sound.c (le2hl, le2hs, be2hl) [!WINDOWSNT]:
Use byteswap.h's macros to swap bytes.
* src/lisp.h (swap16, swap32, swap64): Remove.
All uses replaced by bswap_16, bswap_32, bswap_64.
2013-10-04 07:36:22 +00:00
|
|
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|
|
/* Given an unsigned 32-bit argument X, return the value corresponding to
|
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|
X with reversed byte order. */
|
2024-05-18 16:33:03 +00:00
|
|
|
_GL_BYTESWAP_INLINE uint_least32_t
|
|
|
|
bswap_32 (uint_least32_t x)
|
|
|
|
{
|
|
|
|
#ifdef _GL_BYTESWAP_HAS_BUILTIN_BSWAP32
|
|
|
|
return __builtin_bswap32 (x);
|
|
|
|
#else
|
|
|
|
uint_fast32_t mask = 0xff;
|
|
|
|
return ( (x & mask << 8 * 3) >> 8 * 3
|
|
|
|
| (x & mask << 8 * 2) >> 8 * 1
|
|
|
|
| (x & mask << 8 * 1) << 8 * 1
|
|
|
|
| (x & mask << 8 * 0) << 8 * 3);
|
|
|
|
#endif
|
|
|
|
}
|
Use hardware support for byteswapping on glibc x86 etc.
On Fedora 19 x86-64, the new bswap_64 needs 1 instruction,
whereas the old swap64 needed 30.
* admin/merge-gnulib (GNULIB_MODULES): Add byteswap.
* lib/byteswap.in.h, m4/byteswap.m4: New files, copied from Gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/fringe.c (init_fringe_bitmap) [WORDS_BIGENDIAN]:
* src/sound.c (le2hl, le2hs, be2hl) [!WINDOWSNT]:
Use byteswap.h's macros to swap bytes.
* src/lisp.h (swap16, swap32, swap64): Remove.
All uses replaced by bswap_16, bswap_32, bswap_64.
2013-10-04 07:36:22 +00:00
|
|
|
|
2024-05-18 16:33:03 +00:00
|
|
|
#ifdef UINT_LEAST64_MAX
|
Use hardware support for byteswapping on glibc x86 etc.
On Fedora 19 x86-64, the new bswap_64 needs 1 instruction,
whereas the old swap64 needed 30.
* admin/merge-gnulib (GNULIB_MODULES): Add byteswap.
* lib/byteswap.in.h, m4/byteswap.m4: New files, copied from Gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/fringe.c (init_fringe_bitmap) [WORDS_BIGENDIAN]:
* src/sound.c (le2hl, le2hs, be2hl) [!WINDOWSNT]:
Use byteswap.h's macros to swap bytes.
* src/lisp.h (swap16, swap32, swap64): Remove.
All uses replaced by bswap_16, bswap_32, bswap_64.
2013-10-04 07:36:22 +00:00
|
|
|
/* Given an unsigned 64-bit argument X, return the value corresponding to
|
|
|
|
X with reversed byte order. */
|
2024-05-18 16:33:03 +00:00
|
|
|
_GL_BYTESWAP_INLINE uint_least64_t
|
|
|
|
bswap_64 (uint_least64_t x)
|
|
|
|
{
|
|
|
|
# ifdef _GL_BYTESWAP_HAS_BUILTIN_BSWAP64
|
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|
return __builtin_bswap64 (x);
|
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|
# else
|
|
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|
uint_fast64_t mask = 0xff;
|
|
|
|
return ( (x & mask << 8 * 7) >> 8 * 7
|
|
|
|
| (x & mask << 8 * 6) >> 8 * 5
|
|
|
|
| (x & mask << 8 * 5) >> 8 * 3
|
|
|
|
| (x & mask << 8 * 4) >> 8 * 1
|
|
|
|
| (x & mask << 8 * 3) << 8 * 1
|
|
|
|
| (x & mask << 8 * 2) << 8 * 3
|
|
|
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| (x & mask << 8 * 1) << 8 * 5
|
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|
|
| (x & mask << 8 * 0) << 8 * 7);
|
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|
|
# endif
|
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|
|
}
|
|
|
|
#endif
|
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|
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#ifdef __cplusplus
|
|
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|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
_GL_INLINE_HEADER_END
|
Use hardware support for byteswapping on glibc x86 etc.
On Fedora 19 x86-64, the new bswap_64 needs 1 instruction,
whereas the old swap64 needed 30.
* admin/merge-gnulib (GNULIB_MODULES): Add byteswap.
* lib/byteswap.in.h, m4/byteswap.m4: New files, copied from Gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/fringe.c (init_fringe_bitmap) [WORDS_BIGENDIAN]:
* src/sound.c (le2hl, le2hs, be2hl) [!WINDOWSNT]:
Use byteswap.h's macros to swap bytes.
* src/lisp.h (swap16, swap32, swap64): Remove.
All uses replaced by bswap_16, bswap_32, bswap_64.
2013-10-04 07:36:22 +00:00
|
|
|
|
|
|
|
#endif /* _GL_BYTESWAP_H */
|