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author | Joseph Myers <joseph@codesourcery.com> | 2012-07-01 13:08:59 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2012-07-01 13:08:59 +0000 |
commit | e84eabb3871c9b39e59323bf3f6b98c2ca9d1cd0 (patch) | |
tree | dff3f1b79454b518d15a7b9bbedeb57ff156bbe8 /ports/sysdeps/m68k/bits/byteswap.h | |
parent | 75f0d3040a2c2de8842bfa7a09e11da1a73e17d0 (diff) | |
parent | e64ac02c24b43659048622714afdc92fedf561fa (diff) |
Merge glibc-ports into ports/ directory.glibc-2.16-ports-merge
Diffstat (limited to 'ports/sysdeps/m68k/bits/byteswap.h')
-rw-r--r-- | ports/sysdeps/m68k/bits/byteswap.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/ports/sysdeps/m68k/bits/byteswap.h b/ports/sysdeps/m68k/bits/byteswap.h new file mode 100644 index 0000000000..029fb32a5c --- /dev/null +++ b/ports/sysdeps/m68k/bits/byteswap.h @@ -0,0 +1,87 @@ +/* Macros to swap the order of bytes in integer values. m68k version. + Copyright (C) 1997, 2002, 2008, 2011 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of 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 GNU C 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 GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + <http://www.gnu.org/licenses/>. */ + +#if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H +# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." +#endif + +#ifndef _BITS_BYTESWAP_H +#define _BITS_BYTESWAP_H 1 + +/* Swap bytes in 16 bit value. We don't provide an assembler version + because GCC is smart enough to generate optimal assembler output, and + this allows for better cse. */ +#define __bswap_constant_16(x) \ + ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)) + +static __inline unsigned short int +__bswap_16 (unsigned short int __bsx) +{ + return __bswap_constant_16 (__bsx); +} + +/* Swap bytes in 32 bit value. */ +#define __bswap_constant_32(x) \ + ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \ + (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24)) + +#if !defined(__mcoldfire__) +static __inline unsigned int +__bswap_32 (unsigned int __bsx) +{ + if (__builtin_constant_p (__bsx)) + return __bswap_constant_32 (__bsx); + __asm__ __volatile__ ("ror%.w %#8, %0;" + "swap %0;" + "ror%.w %#8, %0" + : "+d" (__bsx)); + return __bsx; +} +#else +static __inline unsigned int +__bswap_32 (unsigned int __bsx) +{ + return __bswap_constant_32 (__bsx); +} +#endif + +#if defined __GNUC__ && __GNUC__ >= 2 +/* Swap bytes in 64 bit value. */ +# define __bswap_constant_64(x) \ + __extension__ \ + ((((x) & 0xff00000000000000ull) >> 56) \ + | (((x) & 0x00ff000000000000ull) >> 40) \ + | (((x) & 0x0000ff0000000000ull) >> 24) \ + | (((x) & 0x000000ff00000000ull) >> 8) \ + | (((x) & 0x00000000ff000000ull) << 8) \ + | (((x) & 0x0000000000ff0000ull) << 24) \ + | (((x) & 0x000000000000ff00ull) << 40) \ + | (((x) & 0x00000000000000ffull) << 56)) + +/* Swap bytes in 64 bit value. */ +static __inline unsigned long long +__bswap_64 (unsigned long long __bsx) +{ + if (__builtin_constant_p (__bsx)) + return __bswap_constant_64 (__bsx); + return (__bswap_32 (__bsx >> 32) + | ((unsigned long long) __bswap_32 (__bsx) << 32)); +} +#endif + +#endif /* _BITS_BYTESWAP_H */ |