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/*=============================================================================
This file is the part of wordaccess.h for use under these
conditions:
* Compilers other than GCC
* GCC before version 3.4
* c libraries other than Glibc
* Specified by the user with WORDACCESS_GENERIC
=============================================================================*/
typedef uint32_t wordint;
typedef unsigned char wordintBytes[sizeof(wordint)];
static __inline__ wordint
bytesToWordint(wordintBytes const bytes) {
wordint retval;
unsigned int i;
/* Note that 'bytes' is a pointer, due to C array degeneration.
That means sizeof(bytes) isn't what you think it is.
*/
for (i = 1, retval = bytes[0]; i < sizeof(wordint); ++i) {
retval = (retval << 8) + bytes[i];
}
return retval;
}
static __inline__ void
wordintToBytes(wordintBytes * const bytesP,
wordint const wordInt) {
wordint buffer;
int i;
for (i = sizeof(*bytesP)-1, buffer = wordInt; i >= 0; --i) {
(*bytesP)[i] = buffer & 0xFF;
buffer >>= 8;
}
}
static unsigned char const clz8[256]= {
8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
static __inline__ unsigned int
clz16(wordint const x) {
if (x >> 8 != 0)
return clz8[x >> 8];
else
return clz8[x] + 8;
}
static __inline__ unsigned int
clz32(wordint const x) {
if (x >> 16 != 0)
return clz16(x >> 16);
else
return clz16(x) +16;
}
static __inline__ unsigned int
wordintClz(wordint const x) {
return clz32(x);
}
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