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Add Linux-compatible rol32/ror32 functions. Amazingly, gcc will

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optimise these down to the correct single "roll"/"rorl" instruction.
This commit is contained in:
Michael Brown 2007-01-24 23:31:58 +00:00
parent 6a765fdc15
commit 9cf5c4557d
1 changed files with 19 additions and 0 deletions
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19
src/include/gpxe/bitops.h Normal file
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#ifndef _GPXE_BITOPS_H
#define _GPXE_BITOPS_H
/** @file
*
* Bit operations
*/
#include <stdint.h>
static inline uint32_t rol32 ( uint32_t data, unsigned int rotation ) {
return ( ( data << rotation ) | ( data >> ( 32 - rotation ) ) );
}
static inline uint32_t ror32 ( uint32_t data, unsigned int rotation ) {
return ( ( data >> rotation ) | ( data << ( 32 - rotation ) ) );
}
#endif /* _GPXE_BITOPS_H */