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Diffstat (limited to 'libc/sysdeps/linux/cris')
-rw-r--r--libc/sysdeps/linux/cris/bits/byteswap.h74
1 files changed, 41 insertions, 33 deletions
diff --git a/libc/sysdeps/linux/cris/bits/byteswap.h b/libc/sysdeps/linux/cris/bits/byteswap.h
index e35c4b63f..4027456ac 100644
--- a/libc/sysdeps/linux/cris/bits/byteswap.h
+++ b/libc/sysdeps/linux/cris/bits/byteswap.h
@@ -1,51 +1,56 @@
#ifndef _BITS_BYTESWAP_H
#define _BITS_BYTESWAP_H 1
-#define ___swab16(x) \
+/* CRIS specific byte swap operations: 16, 32 and 64-bit */
+
+/* Swap bytes in 16 bit value. */
+#define __bswap_constant_16(x) \
({ \
unsigned short __x = (x); \
((unsigned short)( \
- (((unsigned short)(__x) & (unsigned short)0x00ffU) << 8) | \
- (((unsigned short)(__x) & (unsigned short)0xff00U) >> 8) )); \
+ (((unsigned short)(__x) & (unsigned short)0x00ffu) << 8) | \
+ (((unsigned short)(__x) & (unsigned short)0xff00u) >> 8) )); \
})
-#define ___swab32(x) \
+#if defined __GNUC__ && __GNUC__ >= 2
+# define __bswap_16(x) \
+ __extension__ \
+ ({ unsigned short __bswap_16_v; \
+ if (__builtin_constant_p (x)) \
+ __bswap_16_v = __bswap_constant_16 (x); \
+ else \
+ __asm__ ("swapb %0" : "=r" (__bswap_16_v) : "0" (x)); \
+ __bswap_16_v; })
+#else
+# define __bswap_16(x) __bswap_constant_16 (x)
+#endif
+
+
+/* Swap bytes in 32 bit value. */
+#define __bswap_constant_32(x) \
({ \
unsigned long __x = (x); \
((unsigned long)( \
- (((unsigned long)(__x) & (unsigned long)0x000000ffUL) << 24) | \
- (((unsigned long)(__x) & (unsigned long)0x0000ff00UL) << 8) | \
- (((unsigned long)(__x) & (unsigned long)0x00ff0000UL) >> 8) | \
- (((unsigned long)(__x) & (unsigned long)0xff000000UL) >> 24) )); \
+ (((unsigned long)(__x) & (unsigned long)0x000000fful) << 24) | \
+ (((unsigned long)(__x) & (unsigned long)0x0000ff00ul) << 8) | \
+ (((unsigned long)(__x) & (unsigned long)0x00ff0000ul) >> 8) | \
+ (((unsigned long)(__x) & (unsigned long)0xff000000ul) >> 24) )); \
})
-/* these are CRIS specific */
-
-static inline unsigned short __fswab16(unsigned short x)
-{
- __asm__ ("swapb %0" : "=r" (x) : "0" (x));
-
- return(x);
-}
-
-static inline unsigned long __fswab32(unsigned long x)
-{
- __asm__ ("swapwb %0" : "=r" (x) : "0" (x));
-
- return(x);
-}
-
-# define __bswap_16(x) \
-(__builtin_constant_p((unsigned short)(x)) ? \
- ___swab16((x)) : \
- __fswab16((x)))
-
+#if defined __GNUC__ && __GNUC__ >= 2
# define __bswap_32(x) \
-(__builtin_constant_p((unsigned long)(x)) ? \
- ___swab32((x)) : \
- __fswab32((x)))
+ __extension__ \
+ ({ unsigned long __bswap_32_v; \
+ if (__builtin_constant_p (x)) \
+ __bswap_32_v = __bswap_constant_32 (x); \
+ else \
+ __asm__ ("swapwb %0" : "=r" (__bswap_32_v) : "0" (x)); \
+ __bswap_32_v; })
+#else
+# define __bswap_32(x) __bswap_constant_32 (x)
+#endif
+
-#if defined __GNUC__ && __GNUC__ >= 2
/* Swap bytes in 64 bit value. */
# define __bswap_constant_64(x) \
((((x) & 0xff00000000000000ull) >> 56) \
@@ -57,6 +62,7 @@ static inline unsigned long __fswab32(unsigned long x)
| (((x) & 0x000000000000ff00ull) << 40) \
| (((x) & 0x00000000000000ffull) << 56))
+#if defined __GNUC__ && __GNUC__ >= 2
# define __bswap_64(x) \
(__extension__ \
({ union { __extension__ unsigned long long int __ll; \
@@ -70,6 +76,8 @@ static inline unsigned long __fswab32(unsigned long x)
__r.__l[1] = __bswap_32 (__w.__l[0]); \
} \
__r.__ll; }))
+#else
+# define __bswap_64(x) __bswap_constant_64 (x)
#endif
#endif /* _BITS_BYTESWAP_H */