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(__bswap_64): Handle constant argument case separately.

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This commit is contained in:
Ulrich Drepper 2000-12-27 20:01:21 +00:00
parent ed073f0e62
commit 3d7f417bde
3 changed files with 59 additions and 14 deletions
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25
bits/byteswap.h
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@ -53,12 +53,27 @@ __bswap_32 (unsigned int __bsx)
#if defined __GNUC__ && __GNUC__ >= 2
/* Swap bytes in 64 bit value. */
#define __bswap_constant_64(x) \
((((x) & 0xff00000000000000ull) >> 56) \
| (((x) & 0x00ff000000000000ull) >> 40) \
| (((x) & 0x0000ff0000000000ull) >> 24) \
| (((x) & 0x000000ff00000000ull) >> 8) \
| (((x) & 0x00000000ff000000ull) << 8) \
| (((x) & 0x0000000000ff0000ull) << 24) \
| (((x) & 0x000000000000ff00ull) << 40) \
| (((x) & 0x00000000000000ffull) << 56))
# define __bswap_64(x) \
(__extension__ \
({ union { unsigned long long int __ll; \
unsigned int __l[2]; } __v, __r; \
__v.__ll = (x); \
__r.__l[0] = __bswap_32 (__v.__l[1]); \
__r.__l[1] = __bswap_32 (__v.__l[0]); \
({ union { __extension__ unsigned long long int __ll; \
unsigned long int __l[2]; } __w, __r; \
if (__builtin_constant_p (x)) \
__r.__ll = __bswap_constant_64 (x); \
else \
{ \
__w.__ll = (x); \
__r.__l[0] = __bswap_32 (__w.__l[1]); \
__r.__l[1] = __bswap_32 (__w.__l[0]); \
} \
__r.__ll; }))
#endif

25
sysdeps/generic/bits/byteswap.h
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@ -53,12 +53,27 @@ __bswap_32 (unsigned int __bsx)
#if defined __GNUC__ && __GNUC__ >= 2
/* Swap bytes in 64 bit value. */
#define __bswap_constant_64(x) \
((((x) & 0xff00000000000000ull) >> 56) \
| (((x) & 0x00ff000000000000ull) >> 40) \
| (((x) & 0x0000ff0000000000ull) >> 24) \
| (((x) & 0x000000ff00000000ull) >> 8) \
| (((x) & 0x00000000ff000000ull) << 8) \
| (((x) & 0x0000000000ff0000ull) << 24) \
| (((x) & 0x000000000000ff00ull) << 40) \
| (((x) & 0x00000000000000ffull) << 56))
# define __bswap_64(x) \
(__extension__ \
({ union { unsigned long long int __ll; \
unsigned int __l[2]; } __v, __r; \
__v.__ll = (x); \
__r.__l[0] = __bswap_32 (__v.__l[1]); \
__r.__l[1] = __bswap_32 (__v.__l[0]); \
({ union { __extension__ unsigned long long int __ll; \
unsigned long int __l[2]; } __w, __r; \
if (__builtin_constant_p (x)) \
__r.__ll = __bswap_constant_64 (x); \
else \
{ \
__w.__ll = (x); \
__r.__l[0] = __bswap_32 (__w.__l[1]); \
__r.__l[1] = __bswap_32 (__w.__l[0]); \
} \
__r.__ll; }))
#endif

23
sysdeps/i386/bits/byteswap.h
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@ -1,5 +1,5 @@
/* Macros to swap the order of bytes in integer values.
Copyright (C) 1997, 1998 Free Software Foundation, Inc.
Copyright (C) 1997, 1998, 2000 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
@ -84,12 +84,27 @@
#if defined __GNUC__ && __GNUC__ >= 2
/* Swap bytes in 64 bit value. */
#define __bswap_constant_64(x) \
((((x) & 0xff00000000000000ull) >> 56) \
| (((x) & 0x00ff000000000000ull) >> 40) \
| (((x) & 0x0000ff0000000000ull) >> 24) \
| (((x) & 0x000000ff00000000ull) >> 8) \
| (((x) & 0x00000000ff000000ull) << 8) \
| (((x) & 0x0000000000ff0000ull) << 24) \
| (((x) & 0x000000000000ff00ull) << 40) \
| (((x) & 0x00000000000000ffull) << 56))
# define __bswap_64(x) \
(__extension__ \
({ union { __extension__ unsigned long long int __ll; \
unsigned long int __l[2]; } __w, __r; \
__w.__ll = (x); \
__r.__l[0] = __bswap_32 (__w.__l[1]); \
__r.__l[1] = __bswap_32 (__w.__l[0]); \
if (__builtin_constant_p (x)) \
__r.__ll = __bswap_constant_64 (x); \
else \
{ \
__w.__ll = (x); \
__r.__l[0] = __bswap_32 (__w.__l[1]); \
__r.__l[1] = __bswap_32 (__w.__l[0]); \
} \
__r.__ll; }))
#endif