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Diffstat (limited to 'libc/sysdeps/linux/v850/bits/byteswap.h')
-rw-r--r--libc/sysdeps/linux/v850/bits/byteswap.h50
1 files changed, 27 insertions, 23 deletions
diff --git a/libc/sysdeps/linux/v850/bits/byteswap.h b/libc/sysdeps/linux/v850/bits/byteswap.h
index b5b07209f..44fbee488 100644
--- a/libc/sysdeps/linux/v850/bits/byteswap.h
+++ b/libc/sysdeps/linux/v850/bits/byteswap.h
@@ -16,44 +16,48 @@
#endif
/* Swap bytes in 16 bit value. */
+#define __bswap_constant_16(x) \
+ ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
+
#ifdef __GNUC__
# define __bswap_16(x) \
(__extension__ \
- ({ unsigned short int __bsh_val = (x); \
- __asm__ ("bsh %1, %0" : "=r" (__bsh_val) : "r" (__bsh_val)); \
- __bsh_val; }))
+ ({ unsigned long int __bswap_16_v; \
+ if (__builtin_constant_p (x)) \
+ __bswap_16_v = __bswap_constant_16 (x); \
+ else \
+ __asm__ ("bsh %1, %0" : "=r" (__bswap_16_v) : "r" (x)); \
+ __bswap_16_v; }))
#else
-static __inline unsigned short int
-__bswap_16 (unsigned short int __bsx)
-{
- return ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8));
-}
+# define __bswap_16(x) __bswap_constant_16 (x)
#endif
/* Swap bytes in 32 bit value. */
+#define __bswap_constant_32(x) \
+ ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
+ (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
+
#ifdef __GNUC__
# define __bswap_32(x) \
(__extension__ \
- ({ unsigned short int __bsw_val = (x); \
- __asm__ ("bsw %1, %0" : "=r" (__bsw_val) : "r" (__bsw_val)); \
- __bsw_val; }))
+ ({ unsigned long int __bswap_32_v; \
+ if (__builtin_constant_p (x)) \
+ __bswap_32_v = __bswap_constant_32 (x); \
+ else \
+ __asm__ ("bsw %1, %0" : "=r" (__bswap_32_v) : "r" (x)); \
+ __bswap_32_v; }))
#else
-static __inline unsigned int
-__bswap_32 (unsigned int __bsx)
-{
- return ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) |
- (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24));
-}
+# define __bswap_32(x) __bswap_constant_32 (x)
#endif
#if defined __GNUC__ && __GNUC__ >= 2
/* Swap bytes in 64 bit value. */
-# define __bswap_64(x) \
+# define __bswap_64(x) \
(__extension__ \
({ union { unsigned long long int __ll; \
- unsigned long int __l[2]; } __v, __r; \
- __v.__ll = (x); \
- __r.__l[0] = __bswap_32 (__v.__l[1]); \
- __r.__l[1] = __bswap_32 (__v.__l[0]); \
- __r.__ll; }))
+ unsigned long int __l[2]; } __bswap_64_v, __bswap_64_r; \
+ __bswap_64_v.__ll = (x); \
+ __bswap_64_r.__l[0] = __bswap_32 (__bswap_64_v.__l[1]); \
+ __bswap_64_r.__l[1] = __bswap_32 (__bswap_64_v.__l[0]); \
+ __bswap_64_r.__ll; }))
#endif