diff options
Diffstat (limited to 'sysdeps/i386/bits')
| -rw-r--r-- | sysdeps/i386/bits/byteswap.h | 72 |
1 files changed, 38 insertions, 34 deletions
diff --git a/sysdeps/i386/bits/byteswap.h b/sysdeps/i386/bits/byteswap.h index 760e0751c9..a1ba6b8748 100644 --- a/sysdeps/i386/bits/byteswap.h +++ b/sysdeps/i386/bits/byteswap.h @@ -27,15 +27,16 @@ #if defined __GNUC__ && __GNUC__ >= 2 # define __bswap_16(x) \ - ({ register unsigned short int __v; \ - if (__builtin_constant_p (x)) \ - __v = __bswap_constant_16 (x); \ - else \ - __asm__ __volatile__ ("rorw $8, %w0" \ - : "=r" (__v) \ - : "0" ((unsigned short int) (x)) \ - : "cc"); \ - __v; }) + (__extension__ \ + ({ register unsigned short int __v; \ + if (__builtin_constant_p (x)) \ + __v = __bswap_constant_16 (x); \ + else \ + __asm__ __volatile__ ("rorw $8, %w0" \ + : "=r" (__v) \ + : "0" ((unsigned short int) (x)) \ + : "cc"); \ + __v; })) #else /* This is better than nothing. */ # define __bswap_16(x) __bswap_constant_16 (x) @@ -52,27 +53,29 @@ `bswap' opcode. On i386 we have to use three instructions. */ # if !defined __i486__ && !defined __pentium__ && !defined __pentiumpro__ # define __bswap_32(x) \ - ({ register unsigned int __v; \ - if (__builtin_constant_p (x)) \ - __v = __bswap_constant_32 (x); \ - else \ - __asm__ __volatile__ ("rorw $8, %w0;" \ - "rorl $16, %0;" \ - "rorw $8, %w0" \ - : "=r" (__v) \ - : "0" ((unsigned int) (x)) \ - : "cc"); \ - __v; }) + (__extension__ \ + ({ register unsigned int __v; \ + if (__builtin_constant_p (x)) \ + __v = __bswap_constant_32 (x); \ + else \ + __asm__ __volatile__ ("rorw $8, %w0;" \ + "rorl $16, %0;" \ + "rorw $8, %w0" \ + : "=r" (__v) \ + : "0" ((unsigned int) (x)) \ + : "cc"); \ + __v; })) # else # define __bswap_32(x) \ - ({ register unsigned int __v; \ - if (__builtin_constant_p (x)) \ - __v = __bswap_constant_32 (x); \ - else \ - __asm__ __volatile__ ("bswap %0" \ - : "=r" (__v) \ - : "0" ((unsigned int) (x))); \ - __v; }) + (__extension__ \ + ({ register unsigned int __v; \ + if (__builtin_constant_p (x)) \ + __v = __bswap_constant_32 (x); \ + else \ + __asm__ __volatile__ ("bswap %0" \ + : "=r" (__v) \ + : "0" ((unsigned int) (x))); \ + __v; })) # endif #else # define __bswap_32(x) __bswap_constant_32 (x) @@ -82,10 +85,11 @@ #if defined __GNUC__ && __GNUC__ >= 2 /* Swap bytes in 64 bit value. */ # define __bswap_64(x) \ - ({ union { 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]); \ - __r.__ll; }) + (__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]); \ + __r.__ll; })) #endif |