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/*=============================================================================
This file is the part of wordaccess.h for use under these
conditions:
* GCC (>=3.4), GLIBC
* 64 bit Little-Endian machines (IA64, X86-64, AMD64)
=============================================================================*/
/*
64 bit hton and ntoh do not exist. Here we use bswap_64.
While bswap_64 works on 64 bit data, __builtin_clzl works on "long" which
may or may not be 64 bits. Code provided to find the right data type and
file off any extra when necessary.
*/
#include <byteswap.h> /* See note above on bswap_64 */
typedef uint64_t wordint;
typedef unsigned char wordintBytes[sizeof(wordint)];
static __inline__ wordint
bytesToWordint(wordintBytes bytes) {
return ((wordint) bswap_64(*(wordint *)bytes));
}
static __inline__ void
wordintToBytes(wordintBytes * const bytesP,
wordint const wordInt) {
*(wordint *)bytesP = bswap_64(wordInt);
}
static __inline__ unsigned int
wordintClz(wordint const x){
unsigned int s;
if (x == 0)
return sizeof(wordint) * 8;
/* Find the data type closest to 64 bits, and file off any extra. */
else if ((s=sizeof(long int)) >= 8)
return (__builtin_clzl((long int)x << (s - 8) * 8));
else if ((s=sizeof(long long int)) >= 8)
return (__builtin_clzll((long long int)x << (s - 8) * 8));
else
pm_error("Long long int is less than 64 bits on this machine");
}
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