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| author | Ulrich Drepper <drepper@redhat.com> | 2000-12-27 20:01:21 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2000-12-27 20:01:21 +0000 |
| commit | 3d7f417bdeeebe0373c0c60ef234065189220f25 (patch) | |
| tree | b39efa870a67347951d72e0d2b5715a7f77f11fd /sysdeps/i386 | |
| parent | ed073f0e6249dc1bcecb3f72fa941d01b516be3f (diff) | |
| download | glibc-3d7f417bdeeebe0373c0c60ef234065189220f25.tar.gz glibc-3d7f417bdeeebe0373c0c60ef234065189220f25.tar.xz glibc-3d7f417bdeeebe0373c0c60ef234065189220f25.zip | |
(__bswap_64): Handle constant argument case separately.
Diffstat (limited to 'sysdeps/i386')
| -rw-r--r-- | sysdeps/i386/bits/byteswap.h | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/sysdeps/i386/bits/byteswap.h b/sysdeps/i386/bits/byteswap.h index a1ba6b8748..64fc56ada2 100644 --- a/sysdeps/i386/bits/byteswap.h +++ b/sysdeps/i386/bits/byteswap.h @@ -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 |