u_long Scm_EqvHash(ScmObj obj)
{
u_long hashval;
if (SCM_NUMBERP(obj)) {
if (SCM_INTP(obj)) {
SMALL_INT_HASH(hashval, SCM_INT_VALUE(obj));
} else if (SCM_BIGNUMP(obj)) {
u_int i;
u_long u = 0;
for (i=0; i<SCM_BIGNUM_SIZE(obj); i++) {
u += SCM_BIGNUM(obj)->values[i];
}
SMALL_INT_HASH(hashval, u);
} else if (SCM_FLONUMP(obj)) {
/* TODO: I'm not sure this is a good hash. */
hashval = (u_long)(SCM_FLONUM_VALUE(obj)*2654435761UL);
} else if (SCM_RATNUMP(obj)) {
/* Ratnum must be normalized, so we can simply combine
hashvals of numerator and denominator. */
u_long h1 = Scm_EqvHash(SCM_RATNUM_NUMER(obj));
u_long h2 = Scm_EqvHash(SCM_RATNUM_DENOM(obj));
hashval = COMBINE(h1, h2);
} else {
/* TODO: I'm not sure this is a good hash. */
hashval = (u_long)((SCM_COMPNUM_REAL(obj)+SCM_COMPNUM_IMAG(obj))*2654435761UL);
}
} else {
ADDRESS_HASH(hashval, obj);
}
return hashval&HASHMASK;
}
/* we need special routines for int64 */
ScmInt64 Scm_BignumToSI64(const ScmBignum *b, int clamp, int *oor)
{
#if SCM_EMULATE_INT64
ScmInt64 r = {0, 0};
if (clamp == SCM_CLAMP_NONE && oor != NULL) *oor = FALSE;
if (b->sign > 0) {
if (b->size > 2 || b->values[1] > LONG_MAX) {
if (!(clamp & SCM_CLAMP_HI)) goto err;
SCM_SET_INT64_MAX(r);
} else {
r.lo = b->values[0];
if (b->size == 2) r.hi = b->values[1];
}
} else if (b->sign < 0) {
if (b->size > 2 || b->values[1] > (u_long)LONG_MAX + 1) {
if (!(clamp&SCM_CLAMP_LO)) goto err;
SCM_SET_INT64_MIN(r);
} else {
b = SCM_BIGNUM(Scm_BignumComplement(b));
r.lo = b->values[0];
if (b->size == 2) r.hi = b->values[1];
else r.hi = -1;
}
}
return r;
#else /*!SCM_EMULATE_INT64*/
int64_t r = 0;
if (clamp == SCM_CLAMP_NONE && oor != NULL) *oor = FALSE;
if (b->sign > 0) {
if (b->size == 1) {
r = b->values[0];
} else if (b->size > 2 || b->values[1] > LONG_MAX) {
if (!(clamp & SCM_CLAMP_HI)) goto err;
SCM_SET_INT64_MAX(r);
} else {
r = ((int64_t)b->values[1] << 32) + (uint64_t)b->values[0];
}
} else { /* b->sign < 0 */
if (b->size == 1) {
r = -(int64_t)b->values[0];
} else if (b->size > 2 || (b->values[1] > LONG_MAX && b->values[0] > 0)) {
if (!(clamp&SCM_CLAMP_LO)) goto err;
SCM_SET_INT64_MIN(r);
} else {
r = -(int64_t)(((int64_t)b->values[1] << 32) + (uint64_t)b->values[0]);
}
}
return r;
#endif /*!SCM_EMULATE_INT64*/
err:
if (clamp == SCM_CLAMP_NONE && oor != NULL) {
*oor = TRUE;
} else {
Scm_Error("argument out of range: %S", SCM_OBJ(b));
}
return r;
}
