bpo-41369 Update to libmpdec-2.5.1: new features (GH-21593)

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Stefan Krah 2020-07-22 21:54:42 +02:00 committed by GitHub
parent 653f420b53
commit 9b9f158275
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2 changed files with 377 additions and 0 deletions

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@ -8656,3 +8656,355 @@ mpd_qimport_u32(mpd_t *result,
mpd_qresize(result, result->len, status); mpd_qresize(result, result->len, status);
mpd_qfinalize(result, ctx, status); mpd_qfinalize(result, ctx, status);
} }
/******************************************************************************/
/* From triple */
/******************************************************************************/
#if defined(CONFIG_64) && defined(__SIZEOF_INT128__)
static mpd_ssize_t
_set_coeff(uint64_t data[3], uint64_t hi, uint64_t lo)
{
__uint128_t d = ((__uint128_t)hi << 64) + lo;
__uint128_t q, r;
q = d / MPD_RADIX;
r = d % MPD_RADIX;
data[0] = (uint64_t)r;
d = q;
q = d / MPD_RADIX;
r = d % MPD_RADIX;
data[1] = (uint64_t)r;
d = q;
q = d / MPD_RADIX;
r = d % MPD_RADIX;
data[2] = (uint64_t)r;
if (q != 0) {
abort(); /* GCOV_NOT_REACHED */
}
return data[2] != 0 ? 3 : (data[1] != 0 ? 2 : 1);
}
#else
static size_t
_uint_from_u16(mpd_uint_t *w, mpd_ssize_t wlen, const uint16_t *u, size_t ulen)
{
const mpd_uint_t ubase = 1U<<16;
mpd_ssize_t n = 0;
mpd_uint_t carry;
assert(wlen > 0 && ulen > 0);
w[n++] = u[--ulen];
while (--ulen != SIZE_MAX) {
carry = _mpd_shortmul_c(w, w, n, ubase);
if (carry) {
if (n >= wlen) {
abort(); /* GCOV_NOT_REACHED */
}
w[n++] = carry;
}
carry = _mpd_shortadd(w, n, u[ulen]);
if (carry) {
if (n >= wlen) {
abort(); /* GCOV_NOT_REACHED */
}
w[n++] = carry;
}
}
return n;
}
static mpd_ssize_t
_set_coeff(mpd_uint_t *data, mpd_ssize_t len, uint64_t hi, uint64_t lo)
{
uint16_t u16[8] = {0};
u16[7] = (uint16_t)((hi & 0xFFFF000000000000ULL) >> 48);
u16[6] = (uint16_t)((hi & 0x0000FFFF00000000ULL) >> 32);
u16[5] = (uint16_t)((hi & 0x00000000FFFF0000ULL) >> 16);
u16[4] = (uint16_t) (hi & 0x000000000000FFFFULL);
u16[3] = (uint16_t)((lo & 0xFFFF000000000000ULL) >> 48);
u16[2] = (uint16_t)((lo & 0x0000FFFF00000000ULL) >> 32);
u16[1] = (uint16_t)((lo & 0x00000000FFFF0000ULL) >> 16);
u16[0] = (uint16_t) (lo & 0x000000000000FFFFULL);
return (mpd_ssize_t)_uint_from_u16(data, len, u16, 8);
}
#endif
static int
_set_uint128_coeff_exp(mpd_t *result, uint64_t hi, uint64_t lo, mpd_ssize_t exp)
{
mpd_uint_t data[5] = {0};
uint32_t status = 0;
mpd_ssize_t len;
#if defined(CONFIG_64) && defined(__SIZEOF_INT128__)
len = _set_coeff(data, hi, lo);
#else
len = _set_coeff(data, 5, hi, lo);
#endif
if (!mpd_qresize(result, len, &status)) {
return -1;
}
for (mpd_ssize_t i = 0; i < len; i++) {
result->data[i] = data[i];
}
result->exp = exp;
result->len = len;
mpd_setdigits(result);
return 0;
}
int
mpd_from_uint128_triple(mpd_t *result, const mpd_uint128_triple_t *triple, uint32_t *status)
{
static const mpd_context_t maxcontext = {
.prec=MPD_MAX_PREC,
.emax=MPD_MAX_EMAX,
.emin=MPD_MIN_EMIN,
.round=MPD_ROUND_HALF_EVEN,
.traps=MPD_Traps,
.status=0,
.newtrap=0,
.clamp=0,
.allcr=1,
};
const enum mpd_triple_class tag = triple->tag;
const uint8_t sign = triple->sign;
const uint64_t hi = triple->hi;
const uint64_t lo = triple->lo;
mpd_ssize_t exp;
#ifdef CONFIG_32
if (triple->exp < MPD_SSIZE_MIN || triple->exp > MPD_SSIZE_MAX) {
goto conversion_error;
}
#endif
exp = (mpd_ssize_t)triple->exp;
switch (tag) {
case MPD_TRIPLE_QNAN: case MPD_TRIPLE_SNAN: {
if (sign > 1 || exp != 0) {
goto conversion_error;
}
const uint8_t flags = tag == MPD_TRIPLE_QNAN ? MPD_NAN : MPD_SNAN;
mpd_setspecial(result, sign, flags);
if (hi == 0 && lo == 0) { /* no payload */
return 0;
}
if (_set_uint128_coeff_exp(result, hi, lo, exp) < 0) {
goto malloc_error;
}
return 0;
}
case MPD_TRIPLE_INF: {
if (sign > 1 || hi != 0 || lo != 0 || exp != 0) {
goto conversion_error;
}
mpd_setspecial(result, sign, MPD_INF);
return 0;
}
case MPD_TRIPLE_NORMAL: {
if (sign > 1) {
goto conversion_error;
}
const uint8_t flags = sign ? MPD_NEG : MPD_POS;
mpd_set_flags(result, flags);
if (exp > MPD_EXP_INF) {
exp = MPD_EXP_INF;
}
if (exp == MPD_SSIZE_MIN) {
exp = MPD_SSIZE_MIN+1;
}
if (_set_uint128_coeff_exp(result, hi, lo, exp) < 0) {
goto malloc_error;
}
uint32_t workstatus = 0;
mpd_qfinalize(result, &maxcontext, &workstatus);
if (workstatus & (MPD_Inexact|MPD_Rounded|MPD_Clamped)) {
goto conversion_error;
}
return 0;
}
default:
goto conversion_error;
}
conversion_error:
mpd_seterror(result, MPD_Conversion_syntax, status);
return -1;
malloc_error:
mpd_seterror(result, MPD_Malloc_error, status);
return -1;
}
/******************************************************************************/
/* As triple */
/******************************************************************************/
#if defined(CONFIG_64) && defined(__SIZEOF_INT128__)
static void
_get_coeff(uint64_t *hi, uint64_t *lo, const mpd_t *a)
{
__uint128_t u128 = 0;
switch (a->len) {
case 3:
u128 = a->data[2]; /* fall through */
case 2:
u128 = u128 * MPD_RADIX + a->data[1]; /* fall through */
case 1:
u128 = u128 * MPD_RADIX + a->data[0];
break;
default:
abort(); /* GCOV_NOT_REACHED */
}
*hi = u128 >> 64;
*lo = (uint64_t)u128;
}
#else
static size_t
_uint_to_u16(uint16_t w[8], mpd_uint_t *u, mpd_ssize_t ulen)
{
const mpd_uint_t wbase = 1U<<16;
size_t n = 0;
assert(ulen > 0);
do {
if (n >= 8) {
abort(); /* GCOV_NOT_REACHED */
}
w[n++] = (uint16_t)_mpd_shortdiv(u, u, ulen, wbase);
/* ulen is at least 1. u[ulen-1] can only be zero if ulen == 1. */
ulen = _mpd_real_size(u, ulen);
} while (u[ulen-1] != 0);
return n;
}
static void
_get_coeff(uint64_t *hi, uint64_t *lo, const mpd_t *a)
{
uint16_t u16[8] = {0};
mpd_uint_t data[5] = {0};
switch (a->len) {
case 5:
data[4] = a->data[4]; /* fall through */
case 4:
data[3] = a->data[3]; /* fall through */
case 3:
data[2] = a->data[2]; /* fall through */
case 2:
data[1] = a->data[1]; /* fall through */
case 1:
data[0] = a->data[0];
break;
default:
abort(); /* GCOV_NOT_REACHED */
}
_uint_to_u16(u16, data, a->len);
*hi = (uint64_t)u16[7] << 48;
*hi |= (uint64_t)u16[6] << 32;
*hi |= (uint64_t)u16[5] << 16;
*hi |= (uint64_t)u16[4];
*lo = (uint64_t)u16[3] << 48;
*lo |= (uint64_t)u16[2] << 32;
*lo |= (uint64_t)u16[1] << 16;
*lo |= (uint64_t)u16[0];
}
#endif
static enum mpd_triple_class
_coeff_as_uint128(uint64_t *hi, uint64_t *lo, const mpd_t *a)
{
#ifdef CONFIG_64
static mpd_uint_t uint128_max_data[3] = { 3374607431768211455ULL, 4028236692093846346ULL, 3ULL };
static const mpd_t uint128_max = { MPD_STATIC|MPD_CONST_DATA, 0, 39, 3, 3, uint128_max_data };
#else
static mpd_uint_t uint128_max_data[5] = { 768211455U, 374607431U, 938463463U, 282366920U, 340U };
static const mpd_t uint128_max = { MPD_STATIC|MPD_CONST_DATA, 0, 39, 5, 5, uint128_max_data };
#endif
enum mpd_triple_class ret = MPD_TRIPLE_NORMAL;
uint32_t status = 0;
mpd_t coeff;
*hi = *lo = 0ULL;
if (mpd_isspecial(a)) {
if (mpd_isinfinite(a)) {
return MPD_TRIPLE_INF;
}
ret = mpd_isqnan(a) ? MPD_TRIPLE_QNAN : MPD_TRIPLE_SNAN;
if (a->len == 0) { /* no payload */
return ret;
}
}
else if (mpd_iszero(a)) {
return ret;
}
_mpd_copy_shared(&coeff, a);
mpd_set_flags(&coeff, 0);
coeff.exp = 0;
if (mpd_qcmp(&coeff, &uint128_max, &status) > 0) {
return MPD_TRIPLE_ERROR;
}
_get_coeff(hi, lo, &coeff);
return ret;
}
mpd_uint128_triple_t
mpd_as_uint128_triple(const mpd_t *a)
{
mpd_uint128_triple_t triple = { MPD_TRIPLE_ERROR, 0, 0, 0, 0 };
triple.tag = _coeff_as_uint128(&triple.hi, &triple.lo, a);
if (triple.tag == MPD_TRIPLE_ERROR) {
return triple;
}
triple.sign = !!mpd_isnegative(a);
if (triple.tag == MPD_TRIPLE_NORMAL) {
triple.exp = a->exp;
}
return triple;
}

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@ -371,6 +371,31 @@ typedef struct mpd_t {
typedef unsigned char uchar; typedef unsigned char uchar;
/******************************************************************************/
/* Triple */
/******************************************************************************/
/* status cases for getting a triple */
enum mpd_triple_class {
MPD_TRIPLE_NORMAL,
MPD_TRIPLE_INF,
MPD_TRIPLE_QNAN,
MPD_TRIPLE_SNAN,
MPD_TRIPLE_ERROR,
};
typedef struct {
enum mpd_triple_class tag;
uint8_t sign;
uint64_t hi;
uint64_t lo;
int64_t exp;
} mpd_uint128_triple_t;
int mpd_from_uint128_triple(mpd_t *result, const mpd_uint128_triple_t *triple, uint32_t *status);
mpd_uint128_triple_t mpd_as_uint128_triple(const mpd_t *a);
/******************************************************************************/ /******************************************************************************/
/* Quiet, thread-safe functions */ /* Quiet, thread-safe functions */
/******************************************************************************/ /******************************************************************************/