#include <stdint.h>
+#ifdef UINT64_MAX
+/* Given an unsigned 64-bit argument X, return the value corresponding
+ to rotating the bits N steps to the left. N must be between 1 and
+ 63 inclusive. */
+static inline uint64_t
+rotl64 (uint64_t x, int n)
+{
+ return ((x << n) | (x >> (64 - n))) & UINT64_MAX;
+}
+
+/* Given an unsigned 64-bit argument X, return the value corresponding
+ to rotating the bits N steps to the right. N must be between 1 to
+ 63 inclusive.*/
+static inline uint64_t
+rotr64 (uint64_t x, int n)
+{
+ return ((x >> n) | (x << (64 - n))) & UINT64_MAX;
+}
+#endif
+
/* Given an unsigned 32-bit argument X, return the value corresponding
to rotating the bits N steps to the left. N must be between 1 and
31 inclusive. */
static inline uint32_t
rotl32 (uint32_t x, int n)
{
- return ((x << n) | (x >> (32 - n))) & 0xFFFFFFFF;
+ return ((x << n) | (x >> (32 - n))) & UINT32_MAX;
}
/* Given an unsigned 32-bit argument X, return the value corresponding
static inline uint32_t
rotr32 (uint32_t x, int n)
{
- return ((x >> n) | (x << (32 - n))) & 0xFFFFFFFF;
+ return ((x >> n) | (x << (32 - n))) & UINT32_MAX;
}
/* Given an unsigned 16-bit argument X, return the value corresponding
to rotating the bits N steps to the left. N must be between 1 to
- 15 inclusive. */
+ 15 inclusive, but on most relevant targets N can also be 0 and 16
+ because 'int' is at least 32 bits and the arguments must widen
+ before shifting. */
static inline uint16_t
rotl16 (uint16_t x, int n)
{
- return ((x << n) | (x >> (16 - n))) & 0xFFFF;
+ return ((x << n) | (x >> (16 - n))) & UINT16_MAX;
}
/* Given an unsigned 16-bit argument X, return the value corresponding
to rotating the bits N steps to the right. N must be in 1 to 15
- inclusive. */
+ inclusive, but on most relevant targets N can also be 0 and 16
+ because 'int' is at least 32 bits and the arguments must widen
+ before shifting. */
static inline uint16_t
rotr16 (uint16_t x, int n)
{
- return ((x >> n) | (x << (16 - n))) & 0xFFFF;
+ return ((x >> n) | (x << (16 - n))) & UINT16_MAX;
+}
+
+/* Given an unsigned 8-bit argument X, return the value corresponding
+ to rotating the bits N steps to the left. N must be between 1 to 7
+ inclusive, but on most relevant targets N can also be 0 and 8
+ because 'int' is at least 32 bits and the arguments must widen
+ before shifting. */
+static inline uint8_t
+rotl8 (uint8_t x, int n)
+{
+ return ((x << n) | (x >> (8 - n))) & UINT8_MAX;
+}
+
+/* Given an unsigned 8-bit argument X, return the value corresponding
+ to rotating the bits N steps to the right. N must be in 1 to 7
+ inclusive, but on most relevant targets N can also be 0 and 8
+ because 'int' is at least 32 bits and the arguments must widen
+ before shifting. */
+static inline uint8_t
+rotr8 (uint8_t x, int n)
+{
+ return ((x >> n) | (x << (8 - n))) & UINT8_MAX;
}
#endif /* _GL_BITROTATE_H */