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Improved prime number test

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This commit is contained in:
Werner Koch 1997-11-27 11:44:13 +00:00
parent 9479cf7e24
commit 649eae8f1b
10 changed files with 392 additions and 267 deletions
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26
mpi/mpi-scan.c
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@ -22,6 +22,7 @@
#include <stdio.h>
#include <stdlib.h>
#include "mpi-internal.h"
#include "longlong.h"
/****************
* Scan through an mpi and return byte for byte. a -1 is returned to indicate
@ -86,3 +87,28 @@ mpi_putbyte( MPI a, unsigned index, int c )
abort(); /* index out of range */
}
/****************
* Count the number of zerobits at the low end of A
*/
unsigned
mpi_trailing_zeros( MPI a )
{
unsigned n, count = 0;
for(n=0; n < a->nlimbs; n++ ) {
if( a->d[n] ) {
unsigned nn;
mpi_limb_t alimb = a->d[n];
count_trailing_zeros( nn, alimb );
count += nn;
break;
}
count += BITS_PER_MPI_LIMB;
}
return count;
}