_lrotl, _lrotr

Rotates bits to the left (_lrotl) or right (_lrotr).

Syntax

unsigned long _lrotl( unsigned long value, int shift );
unsigned long _lrotr( unsigned long value, int shift );

Parameters

value
Value to be rotated.

shift
Number of bits to shift value.

Return value

Both functions return the rotated value. There's no error return.

Remarks

The _lrotl and _lrotr functions rotate value by shift bits. _lrotl rotates the value left, toward more significant bits. _lrotr rotates the value right, toward less significant bits. Both functions wrap bits rotated off one end of value to the other end.

Requirements

For more compatibility information, see Compatibility.

Example

// crt_lrot.c

#include <stdlib.h>
#include <stdio.h>

int main( void )
{
   unsigned long val = 0x0fac35791;

   printf( "0x%8.8lx rotated left eight bits is 0x%8.8lx\n",
            val, _lrotl( val, 8 ) );
   printf( "0x%8.8lx rotated right four bits is 0x%8.8lx\n",
            val, _lrotr( val, 4 ) );
}

0xfac35791 rotated left eight bits is 0xc35791fa
0xfac35791 rotated right four bits is 0x1fac3579

See also

Math and floating-point support
_rotl, _rotl64, _rotr, _rotr64